Having Light Beams Of Different Frequencies (e.g., Heterodyning) Patents (Class 356/484)
  • Patent number: 10883817
    Abstract: A method for full-field measurement using Doppler imaging, comprising the following steps: turning on a laser and adjusting the laser; adjusting a spatial filter to obtain circular laser spots having uniform intensity distribution; adjusting a quarter-wave plate and a whole polarizer in a system, and requiring two beams in a reference object and a measured object having different frequencies and perpendicular polarization directions; applying slight pressure to the measured object, setting a charge coupled device (CCD) camera into a continuous acquisition mode, observing interference fringes, and adjusting a light path so that the fringes are clear and visible; setting the sampling frequency, sampling time, captured image format and resolution size of the CCD camera; turning on a lithium niobate crystal drive power switch to produce a heterodyne carrier frequency; applying continuous equal pushing force to the measured object by means of piezoelectric ceramics (PZT) so as to make the measured object produce c
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: January 5, 2021
    Assignee: Beijing Jiaotong University
    Inventors: Zhan Gao, Jie Qin, Qibo Feng, Shengjia Wang, Xu Wang, Shanwei Yang, Chenjia Gao
  • Patent number: 10824229
    Abstract: Aspects of the present disclosure describe systems, methods, and structures that provide eye-tracking by 1) steering a beam of light through the effect of a microelectromechanical system (MEMS) operating at a resonant frequency onto a corneal surface; and 2) detecting the light reflected from the corneal surface.
    Type: Grant
    Filed: January 20, 2018
    Date of Patent: November 3, 2020
    Assignee: AdHawk Microsystems
    Inventor: Niladri Sarkar
  • Patent number: 10739195
    Abstract: A method and an apparatus for analyzing a component of an object are provided. The apparatus includes an image sensor including an optical module, and the optical module includes a light source configured to emit a source light, a first detector configured to detect a first light that is scattered or reflected from the object on which the emitted source light is incident, and a second detector configured to detect a second light that is emitted by the light source but is not incident on the object. The apparatus further includes a processor configured to calculate a scattering coefficient and an absorption coefficient, based on the detected first light and the detected second light, and analyze the component of the object, based on the calculated scattering coefficient and the calculated absorption coefficient.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: August 11, 2020
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hyeong Seok Jang, Hyun Seok Moon, Jae Wook Shim, Kun Sun Eom, Myoung Hoon Jung
  • Patent number: 10727952
    Abstract: A heterodyne starring array active imager for producing an image. The imager comprises a light source and a component for segregating the light into frequency bands, each band intermittently illuminating a region of a scene and an array of light collecting sites, each comprising: a coupling component optically coupling scene light into a first waveguide and a local oscillator light coupled into a second waveguide. First and second waveguides coupled to a third waveguide with scene light and local oscillator light propagating into the third waveguide. A square law photo detector at each light collecting site receives the merged light for heterodyning the scene light and the local oscillator light. Components receive and process the heterodyned light from the photo detectors to produce a frame signal for each light collecting site. A read-out device produces an array signal responsive to the frame signal from each light collecting site.
    Type: Grant
    Filed: March 9, 2020
    Date of Patent: July 28, 2020
    Inventor: Richard H. Vollmerhausen
  • Patent number: 10707419
    Abstract: A method of forming a device includes emitting a coherent light beam and providing a mask including a region transparent to the light beam. The method further includes projecting the light beam on a photosensitive layer through the transparent region of the mask. The method further includes forming a recess in the photosensitive layer, wherein the recess corresponds to a position of the transparent region of the mask. The method further includes filling an organic light emitting material in the recess.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: July 7, 2020
    Assignee: INT TECH CO., LTD.
    Inventor: Chien-Yu Chen
  • Patent number: 10670467
    Abstract: A device for measuring surface-temperature of a turbine blade, the device including a probe having a front-end mirror for receiving infrared radiation of a surface on the blade, a collimation lens for refracted the infrared radiation, a PD detector to receive the infrared radiation, and a focal-length servo; and a radial-scanning servo connected to the probe. The front-end mirror, the collimation lens, and PD detector are disposed along the optical axis of the collimation lens. The focal-length servo is adapted to move the collimation lens along the optical axis of the collimation lens. The radial-scanning servo is adapted to move the probe along the optical axis of the collimation lens. The device of the invention is capable of accurately targeting a particular point on the blade having an irregular shape for temperature measurement to accurately detect the temperature distribution on the surface of the blade.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: June 2, 2020
    Assignee: UNIVERSITY OF ELECTRONIC SCIENCE AND TECHNOLOGY OF CHINA
    Inventors: Chao Wang, Jun Hu, Fei Wang, Zezhan Zhang, Jing Jiang, Jie Xiong, Yueming Wang, Tiezhong Ma, Dong Yan, Xueke Gou, Ting Zhou, Yi Niu, Pei Huang
  • Patent number: 10673530
    Abstract: A free-space optical communication method is provided. The method includes generating, at a transmitter of a satellite, an optical frequency comb and a pump signal, modulating the optical frequency comb to generate a data signal and an idler signal that is a phase conjugate of the data signal, attenuating the pump signal, transmitting over free-space, from the satellite, a communication signal having the data signal, the idler signal and the pump signal, receiving from the satellite, at a receiver, the transmitted communication signal having the data signal, the idler signal, and the attenuated pump signal, amplifying, at a phase-sensitive amplifier, the data signal and the idler signal, and demodulating the data signal and the idler signal to extract data.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: June 2, 2020
    Inventors: Jane Deborah LeGrange, Inuk Kang
  • Patent number: 10608747
    Abstract: The present invention relates to communication systems, devices, and methods for providing for a wide bandwidth optical receiver including amplification through optical beating from a local oscillator laser operating without a phase-locked loop at frequency near the receiver optical signal and decreasing the system-performances dependence on optical polarization alignment between the signal and the local oscillator. Systems, devices, and methods including a local oscillator providing a local oscillator signal having a local oscillator frequency that may be controlled based on a frequency offset from the signal center frequency through the use of monitoring signals representative of the frequency offset. A combiner/splitter couples the optical data signal with light from the local oscillator to provide first and second coupled optical signals with orthogonal polarization. Two opto-electrical converters for converting first and second coupled signals into first and second electrical signals.
    Type: Grant
    Filed: July 1, 2019
    Date of Patent: March 31, 2020
    Assignee: Bifrost Communications ApS
    Inventors: Jesper Bevensee Jensen, Bo Pedersen
  • Patent number: 10598600
    Abstract: The invention relates to an optical sensor system, which is designed to interact with a mobile computer device, which has at least one light source and at least one camera, wherein the sensor system has at least one incoupling interface for coupling light from the light source of the computer device into the sensor system and at least one outcoupling interface for coupling light from the sensor system out to the camera of the computer device, wherein the sensor system has at least one optical light-guiding path, by means of which the outcoupling interface is optically connected to the incoupling interface, wherein at least one sensor designed to modify the light guided by the light-guiding path according to a physical quantity influencing the sensor system from outside is arranged in the light-guiding path, wherein at least one sensor designed to modify the light guided by the light-guiding path according to an influencing quantity influencing the sensor system from outside is arranged in the light-guiding pa
    Type: Grant
    Filed: November 4, 2015
    Date of Patent: March 24, 2020
    Assignee: GOTTFRIED WILHELM LEIBNIZ UNIVERSITAT HANNOVER
    Inventors: Kort Bremer, Bernhard Roth, Johanna-Gabriela Walter
  • Patent number: 10587347
    Abstract: A heterodyne starring array active imager for producing an image. The imager comprises a light source intermittently illuminating a scene and an array of light collecting sites imaging the scene, each one comprising: a coupling component optically coupling scene light into a first waveguide and a local oscillator light coupled into a second waveguide. The first and second waveguides coupled to a third waveguide such that the scene light and local oscillator light propagate into the third waveguide. A square law photo detector associated with each light collecting site receives the merged light for heterodyning the scene light and the local oscillator light. Components receive and process the heterodyned light from the photo detectors to produce a frame signal for each light collecting site. A read-out device produces an array signal responsive to the frame signal from each light collecting site.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: March 10, 2020
    Inventor: Richard H. Vollmerhausen
  • Patent number: 10578492
    Abstract: A polarimeter for measuring a polarization rotation caused by a measurement object is provided, the polarimeter including an optically active material. The polarimeter includes a light source unit for irradiating a measurement object with light having a specific polarization; an anisotropic meta surface element for splitting reaction light, obtained by reacting the light of the specific polarization irradiated by the light source unit with the measurement object, into first and second reaction light; and a detection unit for detecting the first and second reaction light separated by the anisotropic meta surface element according to polarization. The polarization rotation caused by the measurement object may be calculated by comparing detection signals of the first and second reaction light detected by the detection unit.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: March 3, 2020
    Assignees: SAMSUNG ELECTRONICS CO., LTD., CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Duhyun Lee, Andrei Faraon, Ehsan Arbabi, Sadegh Faraji-Dana, Mahsa Seyedeh Kamali, Yu Horie, Chanwook Baik
  • Patent number: 10555771
    Abstract: The present invention relates generally to surgical lasers and more specifically to a laser beam control and delivery system that accurately and efficiently directs a laser beam into an optical fiber. The laser beam control and delivery system also provides additional functions, including a connection for a fiber tip temperature control system and a tissue temperature sensing system. The present invention also relates to a surgical laser system that has a high efficiency thermoelectric cooling system.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: February 11, 2020
    Assignee: Xintec Corporation aba Convergent Laser Technology
    Inventors: John L. Rink, Anh Hoang
  • Patent number: 10429234
    Abstract: A distributed fiber optic acoustic detection device employs a novel distributed acoustic detection method using a phase noise cancelling distributed acoustic sensing (PNC-DAS) technique.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: October 1, 2019
    Assignee: NEUBREX CO., LTD.
    Inventors: Kenichi Nishiguchi, Kinzo Kishida, Che-Hsien Li
  • Patent number: 10383508
    Abstract: Provided is an endoscope including a hand piece held by a hand and a main body connected to the hand piece. The hand piece may include a high-strength bar having an optical path providing unit formed therein, the main body may include: a light source unit for providing light; and a light processing unit for processing light, and the light processing unit may include: a beam splitter for splitting the light of the light source unit into a first beam serving as a reference beam and a second beam serving as a sample beam; and a scanner provided at the rear of the beam splitter so as to vary the angle of the second beam.
    Type: Grant
    Filed: February 20, 2015
    Date of Patent: August 20, 2019
    Assignees: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, KOREA UNIVERSITY RESEARCH AND BUSINESS FOUNDATION
    Inventors: Euiheon Chung, Wonshik Choi, Changhyeong Yoon
  • Patent number: 10389440
    Abstract: A coherent optical receiver device includes a first unit configured to output local oscillation light having a predetermined wavelength, a second unit configured to receive an optical signal to have been inputted by making the optical signal interfere with the local oscillation light, a third unit configured to process electrically the optical signal received by the second unit, a fourth unit configured to monitor at least a part of power of the optical signal, and a fifth unit configured to control power of the local oscillation light output by the first unit depending on an optical power monitored by the fourth unit.
    Type: Grant
    Filed: January 29, 2016
    Date of Patent: August 20, 2019
    Assignee: NEC CORPORATION
    Inventors: Masao Morie, Kouichi Suzuki
  • Patent number: 10371678
    Abstract: A method in which a gas property (Q) is determined by correlation from physical measuring quantities (?j) of the gas mixtures. In the method, the physical measuring quantities are combined into a sensor output (Sout) by making use of a sensor output function (ƒ), wherein the sensor output function is determined in such a way that a group of gas mixtures can be separated from a set of gas mixtures for which the gas property (Q) is determined, within which the correlation between the sensor output (Sout) and the desired gas property (Q) is better than in the entire set.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: August 6, 2019
    Assignee: MEMS AG
    Inventors: Philippe Pretre, Andreas Kempe
  • Patent number: 10373301
    Abstract: A method for detecting a crack in a structural component includes receiving, with a processor, signals indicative of at least one image for a critical location in the structural component; determining, with the processor, at least one shape in the at least one image, the at least one shape being representative of a structure of the critical location; representing, with the processor, at least one region around the structure into a matrix; and applying, with the processor, image processing on the matrix to detect cracks in the at least one region of the structural component.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: August 6, 2019
    Assignee: SIKORSKY AIRCRAFT CORPORATION
    Inventors: Zaffir A. Chaudhry, Alan Matthew Finn, Ziyou Xiong, Hongcheng Wang, Patrick Louis Clavette
  • Patent number: 10367588
    Abstract: The present invention relates to communication systems, devices, and methods for providing for a wide bandwidth optical receiver including amplification through optical beating from a local oscillator laser operating without a phase-locked loop at frequency near the receiver optical signal and decreasing the system-performances dependence on optical polarization alignment between the signal and the local oscillator. Systems, devices, and methods including a local oscillator providing a local oscillator signal having a local oscillator frequency that may be controlled based on a frequency offset from the signal center frequency through the use of monitoring signals representative of the frequency offset. A combiner/splitter couples the optical data signal with light from the local oscillator to provide first and second coupled optical signals with orthogonal polarization. Two opto-electrical converters for converting first and second coupled signals into first and second electrical signals.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: July 30, 2019
    Assignee: Bifrost Communications ApS
    Inventors: Jesper Bevensee Jensen, Bo Pedersen
  • Patent number: 10213105
    Abstract: A system for tracking eye location is disclosed. Systems in accordance with the present invention include a scanner for sweeping a first optical signal across the surface of an eye, a detector for detecting a second optical signal reflected from the eye, and a detection circuit for determining a maximum intensity in the second optical signal. In operation, the scanner sweeps the first optical signal over the surface of the eye while the detection circuitry determines a plurality of intensity maxima in the second optical signal. The time between the intensity maxima during the sweep is indicative of the location of the cornea within the eye surface.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: February 26, 2019
    Assignee: AdHawk Microsystems
    Inventor: Niladri Sarkar
  • Patent number: 10190916
    Abstract: A system for type-2 ghost imaging of an object located in or obstructed by a turbulent air section includes a thermal light source, a beamsplitter configured to split light from the thermal light source into two optical paths of substantially equal length, a surface divided into two regions of equal area, a first region including the object and a second region that does not include the object, a narrowband spectral filter, and at least one detector having a predetermined spatial resolution and a predetermined temporal resolution. The object is located on one side of the turbulent air section and the at least one detector is located on another side of the turbulent air section. The at least one detector may be a large area picosecond photo-detector (LAPPD) having a spatial resolution of the order of millimeters and a temporal resolution of the order of 10 to 100 picoseconds.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: January 29, 2019
    Assignee: U.S. Department of Energy
    Inventor: Bernhard W. Adams
  • Patent number: 10178856
    Abstract: Systems, apparatuses, and methods of classifying flying insects. The methods utilize recording the wingbeat frequency and amplitude spectrum of flying insects and comparing them to known or created insect models to properly classify the flying insect. The error rate of the classification is reduced by utilizing multiple inputs to the classification system, which may include a precise circadian rhythm for the time of year, current environmental conditions, and flight velocity or direction.
    Type: Grant
    Filed: August 31, 2016
    Date of Patent: January 15, 2019
    Inventors: Agenor Mafra-Neto, Eamonn Keogh
  • Patent number: 10078032
    Abstract: Disclosed herein is a circuit for determining failure of a movable MEMS mirror. The circuit includes an integrator receiving an opening angle signal representing an opening angle of the movable MEMS mirror, and a differentiator receiving the opening angle signal. A summing circuit is configured to sum the integrator output and the differentiator output. A comparison circuit is configured to determine whether the sum of the integrator output and differentiator output is not within a threshold window. An indicator circuit is configured to generate an indicator signal indicating that the movable MEMS mirror has failed based on the comparison circuit indicating that the sum of the integrator output and differentiator output is not within the threshold window.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: September 18, 2018
    Assignee: STMicroelectronics LTD
    Inventor: Sason Sourani
  • Patent number: 10068345
    Abstract: A system and method involve receiving a sequence of images of an object with at least two consecutive images of the sequence being spatially shifted relative to each other. Each image is transformed into a Fourier domain using a Fourier transform to generate a corresponding plurality of Fourier transformed images. An amplitude filtered pattern is calculated in the Fourier domain based on amplitude components of the plurality of Fourier transformed images. Spatial shifts for pairs of consecutive images in the sequence of images are determined using the amplitude filtered pattern. Images in the sequence of images are aligned based on the determined spatial shifts and the aligned images are summed to form an image-shift-corrected summed image.
    Type: Grant
    Filed: February 14, 2018
    Date of Patent: September 4, 2018
    Assignee: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Daliang Zhang, Yu Han, Kun Li, Yihan Zhu
  • Patent number: 10006871
    Abstract: Methods and apparatuses for the removal, analysis and/or detection of harmful airborne molecular contaminants (AMCs). In one embodiment, an ionizing radiation source is utilized to remove the harmful AMCs from a flow stream via radiolytic particle generation and subsequent capture by filtration. The captured particles may be released, for example, by re-gasification for analysis at much higher concentrations. In another embodiment, the ionizing radiation source is utilized with a particle detector to sense when harmful AMCs are present. In one embodiment, a solid optical medium is exposed to a monitored environment so that the AMCs are in contact with a surface of the solid optical medium. A focused light beam is arranged to emerge from a solid optical medium at an energy density sufficient to cause the AMCs to form deposits on the exposed surface of the solid optical medium, which can be detected using an interferometric technique.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: June 26, 2018
    Assignee: TSI, Incorporated
    Inventor: Stanley L. Kaufman
  • Patent number: 9995634
    Abstract: To measure the frequency of a laser, the frequency of a beat signal that is generated by the interference between an optical frequency comb, used as the reference of measurement, and the laser to be measured is measured. In such a laser frequency measurement using the optical frequency comb, at least one of a repetition frequency and a CEO frequency of the optical frequency comb is changed so that the frequency of the beat signal becomes a predetermined value, and the frequency of the beat signal is measured, so that the frequency of the laser is measured. This allows measurement of the frequency of laser having large frequency variation and low stability.
    Type: Grant
    Filed: July 6, 2015
    Date of Patent: June 12, 2018
    Assignee: MITUTOYO CORPORATION
    Inventor: Kazuhiko Kawasaki
  • Patent number: 9991959
    Abstract: An optical oscillator 10 combines optical signals L1? and L2 to generate an optical signal L3. The optical signal L1? includes light waves W1? and W2? having frequencies spaced apart by a frequency difference ?f1. The optical signal L2 includes light waves W3 and W4 having frequencies spaced apart by a frequency difference ?f2. The optical oscillator 10 separates the optical signal L3 into optical signals L4 and L5, wherein the optical signal L4 includes the light waves W1? and W3 and the optical signal L5 includes the light waves W2? and W4. The optical oscillator 10 compares the frequency differences ?f1 and ?f2 based on frequency difference ?f3 between the light waves W1? and W3 included in the optical signal L4 and frequency difference ?f4 between the light waves W2? and W4 included in the optical signal L5.
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: June 5, 2018
    Assignee: NATIONAL INSTITUTES OF NATURAL SCIENCES
    Inventor: Hitoshi Kiuchi
  • Patent number: 9921489
    Abstract: An inspection apparatus (300) includes a focus monitoring arrangement (500, 500?). Focusing radiation (505) comprises radiation having a first wavelength and radiation having a second wavelength. Reference radiation and focusing radiation at each wavelength are provided with at least one relative frequency shift so that the interfering radiation detected in the detection system includes a time-varying component having a characteristic frequency. A focus detection system (520) comprises one or more lock-in detectors (520b, 520c, 900). Operating the lock-in detectors with reference to both the first and second characteristic frequencies allows the arrangement to select which of the first and second focusing radiation is used to determine whether the optical system is in focus. Good quality signals can be obtained from targets of different structure.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: March 20, 2018
    Assignee: ASML Netherlands B.V.
    Inventors: Amandev Singh, Henricus Petrus Maria Pellemans
  • Patent number: 9906870
    Abstract: Recording, manipulating, distributing and creating sound pressure waves in one or more media by employing an apparatus that transfers the energy between photons and particles of the media is disclosed. An exemplary apparatus comprises one or more lasers and an isotropic or anisotropic medium for photon processing and distribution. An exemplary method comprises determining the target locations for sound pressure wave recording, manipulating or creation; transmitting photons to the target locations; transferring photon energy to media particles to create or manipulate a sound pressure wave; or transferring energy of media particles to photons for recording or manipulating a sound pressure wave.
    Type: Grant
    Filed: April 1, 2016
    Date of Patent: February 27, 2018
    Inventor: Aalap Rajendra Shah
  • Patent number: 9759654
    Abstract: Systems and methods for measuring the isotope ratio of one or more trace gases and/or components of gas mixtures such as different gas species present in a gas mixture. The system includes a resonant optical cavity having two or more mirrors and containing a gas, the cavity having a free spectral range that equals the difference between frequencies of two measured absorption lines of different gas species in the gas, or of two different isotopes, divided onto an integer number. The system also includes a continuous-wave tunable laser optically coupled with the resonant optical cavity, and a detector system for measuring an absorption of laser light by the gas in the cavity. The detector system includes one of a photo-detector configured to measure an intensity of the intra-cavity light or both a photo-acoustic sensor configured to measure photo-acoustic waves generated in the cavity and a photo-detector configured to measure an intensity of the intra-cavity light.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: September 12, 2017
    Assignee: Li-Cor, Inc.
    Inventors: Serguei Koulikov, Alexander Kachanov
  • Patent number: 9759553
    Abstract: Illustrative embodiments of determining geometric characteristics of reflective surfaces are disclosed. In at least one illustrative embodiment, a method of determining geometric characteristics of reflective surfaces includes sensing electromagnetic waves with a sensor, where the electromagnetic waves have been reflected off a reflective surface of a specimen from a target structure including a feature point. The method further includes determining a displacement of the feature point of the target structure indicated by the sensed electromagnetic waves relative to reference data indicating a reference location for the feature point and determining a surface slope of a point of the reflective surface based on the determined displacement of the feature point of the target structure.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: September 12, 2017
    Assignee: AUBURN UNIVERSITY
    Inventors: Hareesh V. Tippur, Chandru Periasamy
  • Patent number: 9726472
    Abstract: Apparatus, systems, and methods of operating a fiber laser having polarization-preserving fibers can be applied as a sensor to detect a physical quantity. In various embodiments, polarization-preserving fibers can provide a laser cavity having an interferometer disposed in the laser cavity. In various embodiments, a fiber optical parametric oscillator can include an interferometer disposed in the cavity of the optical parametric oscillator. Additional apparatus, systems, and methods are disclosed.
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: August 8, 2017
    Assignee: STC.UNM
    Inventors: Jean-Claude Diels, Ladan Arissian
  • Patent number: 9709668
    Abstract: A reconfigurable photonic integrated circuit focal plane array (RPIC-FPA) includes detectors and photonic integrated circuit coupled to the detectors that are configured to mix a return signal beam with local oscillator (LO) beams to produce a combined beam and direct the combined beam to the detectors. The LO beams have reconfigurable optical properties enabled by the RTIC-FPA. The LO beams are individually addressed to switch the detectors between a direct detection mode and various coherent detection modes based on adjustments to the optical properties of the LO beams. In the coherent detection mode, the controller is configured to mix the return signal beam with the LO beam having adjusted optical properties to produce the combined beam, and, in the direct detection mode, the controller is configured to disable the LO beams based on adjustments to the optical properties and to direct the return signal beam to the detectors without mixing.
    Type: Grant
    Filed: March 16, 2016
    Date of Patent: July 18, 2017
    Assignee: Lockheed Martin Coherent Technologies, Inc.
    Inventors: Piotr Konrad Kondratko, Philip Gatt, John Glennon, Brian Carroll Redman, Paul J. M. Suni
  • Patent number: 9678003
    Abstract: Systems and methods for measuring the isotope ratio of one or more trace gases and/or components of gas mixtures such as different gas species present in a gas mixture. The system includes a resonant optical cavity having two or more mirrors and containing a gas, the cavity having a free spectral range that equals the difference between frequencies of two measured absorption lines of different gas species in the gas, or of two different isotopes, divided onto an integer number. The system also includes a continuous-wave tunable laser optically coupled with the resonant optical cavity, and a detector system for measuring an absorption of laser light by the gas in the cavity. The detector system includes one of a photo-detector configured to measure an intensity of the intra-cavity light or both a photo-acoustic sensor configured to measure photo-acoustic waves generated in the cavity and a photo-detector configured to measure an intensity of the intra-cavity light.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: June 13, 2017
    Assignee: Li-Cor, Inc.
    Inventors: Serguei Koulikov, Alexander Kachanov
  • Patent number: 9658112
    Abstract: A dynamic phase acquisition device includes a light collecting opening, a semi-reflecting and semi-transmitting mirror, a phase shifter, a polarizer, a plane reflector, a photosensing element and a phase processor. In the dynamic phase acquisition device, light passes through the light collecting opening to the semi-reflecting and semi-transmitting mirror, and then is divided into two channels. One channel of the light sequentially passes through the phase shifter, the polarizer to the photosensing element, to form a first image; the other channel of the light, after being reflected by the plane reflector, directly passes through the polarizer to the photosensing element, to form a second image. The photosensing element sends the first image and the second image to the phase processor, and the phase processor obtains phase data; and a leading or lagging phase shift range of the phase shifter is 1 degree to 20 degrees.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: May 23, 2017
    Assignee: SHENZHEN ORBBEC CO., LTD.
    Inventor: Yuanhao Huang
  • Patent number: 9625350
    Abstract: A refractive index distribution measuring method includes dividing light emitted from a light source into reference light and test light, causing the reference light to interfere with the test light, which test light has passed through a test object, measuring a phase difference between the reference light and the test light for each of first and second wavelengths, and measuring a wavefront aberration of the test light for each of the first and second wavelengths. The refractive index distribution measuring method further includes calculating a phase-difference difference amount, which is a difference between the phase differences for the first wavelength and the second wavelength, calculating a wavefront aberration difference amount, which is a difference between the wavefront aberrations for the first wavelength and the second wavelength, and calculating a refractive index distribution of the test object based on the phase-difference difference amount and the wavefront aberration difference amount.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: April 18, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tomohiro Sugimoto
  • Patent number: 9557173
    Abstract: A gyroscope including a dielectric resonator, a laser vibrometer on a first side of the dielectric resonator, and a laser dump for redirecting or absorbing light received at the laser dump from the laser vibrometer, the laser dump on a second side of the dielectric resonator. A first distance between the dielectric resonator and the laser vibrometer ranges from 10 nm to 20 ?m, and a second distance between the dielectric resonator and the laser dump ranges from 10 nm to 20 ?m.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: January 31, 2017
    Assignee: HRL Laboratories, LLC
    Inventors: Raviv Perahia, Richard J. Joyce
  • Patent number: 9535200
    Abstract: An apparatus for simultaneously measuring linear and circular polarization components of light is provided, and contains no moving parts. The apparatus may include a prism assembly configured to receive collimated light and splits the light into different directions according to its polarization state. The apparatus may also include lenses configured to collimate light from an image plane to be analyzed by the prism assembly, or direct the light that is split by the prism assembly to different detectors or locations on an image plane.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: January 3, 2017
    Assignee: The Aerospace Corporate
    Inventor: John D Perreault
  • Patent number: 9518869
    Abstract: The invention concerns an electronic method for extracting the amplitude ES and the phase ?S of an electrical signal in a synchronous detector, the signal containing a modulated part Imod of the form Imod ? ES f(t)*cos(?S??R(t)), where ?R(t) and f(t) are two known temporal modulation functions. The method comprises the following steps: multiplying the signal by two reference signals C(t) and S(t) constructed from ?R(t) and f(t); integrating the resulting signals over a time tint; determining the amplitude and phase of said signal from the quantities X and Y resulting from the previous integrations. The method is characterised in that: said electrical signal is multiplied by C(t) and S(t) that can be decomposed on the same set of frequencies as those present in Imod. The invention also concerns the application of the above method in interferometric circuits and the use and execution of the above method.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: December 13, 2016
    Assignee: UNIVERSITE DE TECHNOLOGIES DE TROYES
    Inventors: Aurelien Pierre Bruyant, Julien Vaillant, Abeer Al Mohtar
  • Patent number: 9482513
    Abstract: Exemplary embodiments of the present disclosure include a combined catheter-based optical coherence tomography-two-photon luminescence (OCT-TPL) imaging system. Exemplary embodiments further include methods to detect, and further characterize the distribution of cellular components (e.g., macrophage, collagen/elastin fiber, lipid droplet) in thin-cap fibroatheromas with high spatial resolution in vivo.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: November 1, 2016
    Assignee: Research Development Foundation
    Inventors: Marc Feldman, Thomas Milner, Tianyi Wang, Jennifer Phipps
  • Patent number: 9471277
    Abstract: Data measured by PS-OCT is corrected in a non-linear manner to enhance the quantitative analysis capability of PS-OCT and permit accurate quantitative diagnosis, including diagnosis of disease stage of lesions, as a useful means for computer diagnosis. Even when retardation per PS-OCT 1 contains error and becomes noise and its distribution is not normal or symmetrical around the true value, measured data is converted using a distribution conversion function obtained by analyzing the characteristics of noise via Monte Carlo simulation to remove the systematic error and estimate the true value otherwise buried in noise and thereby correct the PS-OCT 1 image more clearly.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: October 18, 2016
    Assignee: UNIVERSITY OF TSUKUBA
    Inventors: Yoshiaki Yasuno, Lian Duan, Masahide Ito
  • Patent number: 9397476
    Abstract: The present invention relates to a laser sensor for self-mixing interferometry. The laser sensor comprises at least one semiconductor laser light source emitting laser radiation and at least one photodetector (6) monitoring the laser radiation of the laser light source. The laser light source is a VECSEL having a gain medium (3) arranged in a layer structure (15) on a front side of a first end mirror (4), said first end mirror (4) forming an external cavity with an external second end mirror (5). The proposed laser sensor provides an increased detection range and can be manufactured in a low-cost production process.
    Type: Grant
    Filed: April 29, 2008
    Date of Patent: July 19, 2016
    Assignee: Koninklijke Philips N.V.
    Inventors: Johannes Baier, Holger Moench
  • Patent number: 9366622
    Abstract: An active heterodyne detection system comprises a continuously tuneable laser source (1) emitting infra-red radiation, means (8) to split the infra-red radiation into a first part and a second part, means (4) to provide a frequency shift between the first part and the second part, means (8, 9) to direct the first part of the infra-red radiation to a target (2), means (4) to provide the second part of the infra-red radiation as a local oscillator, means (8, 9) to collect a scattered component of the first part of the infra-red light from the target (2), and means (5) to mix the scattered component and the local oscillator and route them to a detector (3) for heterodyne detection over a continuous spectral range. A method of active heterodyne detection over a continuous spectral range is also disclosed.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: June 14, 2016
    Assignee: ITI SCOTLAND LIMITED
    Inventor: Damien Weidmann
  • Patent number: 9360434
    Abstract: An object of the present invention is to provide an optical inspection apparatus that suppresses an influence of quantum noise and obtains superior defect detection performance even when an amount of light is small and a method thereof. In order to resolve the above problem, the present invention provides an optical inspection apparatus that includes a light source which radiates light to a sample; a light interference device which causes target light transmitted, scattered, or reflected from the sample and reference light to interfere with each other, such that strength of light after the interference becomes lower than strength of the target light; a photon counter which measures a photon number of the light after the interference by the light interference device; and a defect identifier which identifies the presence or absence of a defect, on the basis of a detected photon number obtained by the photon counter.
    Type: Grant
    Filed: February 12, 2013
    Date of Patent: June 7, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Nakahira, Toshifumi Honda
  • Patent number: 9243885
    Abstract: An optical coherence tomography system utilizes an optical swept source that frequency scans at least two different sweep rates. In this way, the system can perform large depth scans of the sample and then the same system can perform shorter depth high precision scans, in one specific example. In order to optimally use the analog to digital converter that samples the interference signal, the system further samples the interference signals at different optical frequency sampling intervals depending upon the selected sweep rates of the optical swept source. This allows the system to adapt to different sweep rates in an optimal fashion.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: January 26, 2016
    Assignee: Axsun Technologies, LLC
    Inventors: Bartley C. Johnson, Brian Goldberg, Dale C. Flanders
  • Patent number: 9236950
    Abstract: A method for determining a presence of a locking signal in a signal received by an optical receiver device, the optical receiver device configured to be used in an optical communications network, the locking signal being a signal exchanged by optical communication devices of the optical communications network in a phase preceding setting up communications between the optical communication devices. The presence of the locking signal is determined by obtaining a direct current component or a component at twice a frequency at which the locking signal is supposed to be modulated, and by obtaining a contribution of the communication signal, if any, on the component.
    Type: Grant
    Filed: January 22, 2013
    Date of Patent: January 12, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Gwillerm Froc
  • Patent number: 9182375
    Abstract: A pulse laser oscillator (11) outputs a first laser beam, a beam splitter splitting the first laser beam into split beams, optical paths (12, 13, 14, 15, 16) propagating light of split beams split, respectively, taking different times for light propagation thereof, a condenser superimposing light of split beams propagated through the optical paths, respectively, on an identical spot of a measuring material (100), for irradiation therewith, a laser interferometer (30) irradiating the measuring material (100) with light of a second laser beam, having light intensity variations resulted from interferences between reference light and light of the second laser beam reflected or scattered, as bases to detect ultrasonic waves energized by light of the first laser beam and transmitted in the measuring material (100), a waveform analyzer (32) calculating a metallic microstructure or a material property of the measuring material (100) based on ultrasonic waves.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: November 10, 2015
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Mitsuhiko Sano
  • Patent number: 9140537
    Abstract: An encoder interferometry system includes a beam splitting element positioned to receive an input beam from a light source, in which the beam splitting element is configured to direct a first portion of the input beam along a measurement path to define a measurement beam and a second portion of the input beam along a reference path to define a reference beam, an encoder scale positioned to diffract the measurement beam at least once, one or more optical components configured and arranged to alter a direction of a first diffracted portion of the measurement beam and a direction of a second diffracted portion of the measurement beam such that beam paths of the first diffracted portion and the second diffracted portion are non-parallel subsequent to the first diffracted portion and the second diffracted portion passing through the beam splitting element, and a detector positioned to receive the first diffracted portion.
    Type: Grant
    Filed: October 23, 2014
    Date of Patent: September 22, 2015
    Assignee: Zygo Corporation
    Inventors: Peter J. de Groot, Michael Schroeder
  • Patent number: 9128050
    Abstract: An apparatus and method for inspecting a graphene board. The graphene board inspecting apparatus for inspecting a graphene board on which at least one graphene layer is formed includes: a light processing unit which emits at least one light on the graphene board, receives the at least one light penetrating the graphene board and converts the received at least one light to an output signal; a transmittance detecting unit which receives the output signal from the light processing unit to inspect a transmittance of the at least one light penetrating the graphene board; and a determination unit which is connected to the transmittance detecting unit and receives the detected transmittance to determine a state of the graphene board by analyzing the detected transmittance.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: September 8, 2015
    Assignee: Hanwha Techwin Co., Ltd.
    Inventor: Dong-kwan Won
  • Publication number: 20150147063
    Abstract: An interferometer is provided that includes a first path and a second path. The first path is configured to propagate an electro-magnetic signal at a first wavelength. The second path is configured to convert a portion of the electro-magnetic signal from the first wavelength to a second wavelength for processing and is configured to convert the portion of the electro-magnetic signal from the second wavelength back to the first wavelength for interference with the electro-magnetic signal of the first path. The first wavelength may be an optical wavelength or any other suitable wavelength of the electro-magnetic spectrum. The second wavelength, which is different than the first wavelength, also may be any suitable wavelength of the electro-magnetic spectrum.
    Type: Application
    Filed: November 17, 2014
    Publication date: May 28, 2015
    Applicant: ALCATEL LUCENT
    Inventor: Peter J. Winzer
  • Publication number: 20150085296
    Abstract: Provided is a photoacoustic microscope, including: an objective lens configured to collect excitation light into a specimen, the excitation light in a wavelength range that is absorbed by an object to be observed; a detection light optical system configured to (i) form an image of a point light source of detection light in a middle portion of a pupil of the objective lens, the detection light having a wavelength that is different from the wavelength range of the excitation light, and (ii) emit the detection light onto the specimen by means of the objective lens; an optical scanning unit configured to deflect the excitation light and the detection light that enter the objective lens, for scanning the specimen; and a light detection unit configured to detect reflected light of the detection light that is reflected by the specimen.
    Type: Application
    Filed: December 3, 2014
    Publication date: March 26, 2015
    Applicant: OLYMPUS CORPORATION
    Inventor: Hisashi ODE