With Periodic Beam Varying Means Patents (Class 250/351)
  • Patent number: 10365209
    Abstract: An apparatus is described for performing dissolved gas analysis on electrical equipment having components immersed in electrical insulating liquid. The apparatus comprises an analyzer including a photo-acoustic spectroscopy (PAS) measurement system for performing gas analysis on a gas sample wherein the PAS measurement system has an elongated channel including a resonant cavity and an electromagnetic energy source. The resonant cavity includes a first portion and a second portion configured for containing at least part of the gas sample, wherein the first portion defines an optical pathway configured for propagation of electromagnetic energy from the electromagnetic energy source. The resonant cavity includes an element configured for obstructing the propagation of the electromagnetic energy through to the second portion of the resonant cavity.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: July 30, 2019
    Assignee: Morgan Schaffer Ltd.
    Inventors: Alexandre Beaudoin, Stephan Brauer, Nicholas Lebel-Buchanan, Andrew MacGillivray, Niculae Mincu, Samuel René de Cotret, Stefan Voinea
  • Patent number: 10043964
    Abstract: A pyroelectric device having a substrate and a first electrode overlying at least a portion of the substrate. A plurality of spaced apart nanometer sized pyroelectric elements are electrically connected to and extending outwardly from the first electrode so that each element forms a single domain. A dielectric material is deposited in the space between the individual elements and a second electrode spaced apart from said first electrode is electrically connected to said pyroelectric elements.
    Type: Grant
    Filed: May 26, 2017
    Date of Patent: August 7, 2018
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ryan C. Toonen, Mathew P. Ivill, Melanie W. Cole
  • Patent number: 9900500
    Abstract: An auto-focusing method of an electronic device is provided. The auto-focusing method includes collecting sensor information using a plurality of sensors of the electronic device when a camera of the electronic device is driven, determining at least one focusing sensor, from among the plurality of sensors, based on the collected sensor information, and focusing on a subject located in an image collected from the camera using the at least one determined focusing sensor.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: February 20, 2018
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jangwon Lee
  • Patent number: 9807289
    Abstract: A lens mount design is presented. The mount can be used on a variety of imaging systems but is targeted at small camera systems such as might be used on mobile phones, cameras, sports cameras, computers and computer peripherals where interchangeable lenses are currently not common place. Embodiments include different attachment mechanisms, environmental barriers, electrical connections, a serial number marking system on the replaceable lens body and methods for using the lens mount and system.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: October 31, 2017
    Inventor: Alex Ning
  • Patent number: 9304310
    Abstract: A STED microscope for producing a 3D image. The microscope has an excitation laser source for providing an excitation laser beam and a depletion laser source for providing stimulated emission depletion laser beam. The excitation beam is capable of exciting fluorescent markers in a sample placed in the sample region and the depletion beam is capable of inducing stimulated emission in the fluorescent marker in the sample in a region around the excitation beam to restrict the size of the region within which the fluorescent markers are excited and wherein the depletion laser source goes through an optical element which creates a cone refractive pattern which induces stimulated emission in the fluorescent marker in the sample. The shape of the light hollow of the cone refractive pattern varies at different distances from the source. This depth profile can be used to distinguish between positions at varying depths within a sample to create a 3D image.
    Type: Grant
    Filed: December 14, 2012
    Date of Patent: April 5, 2016
    Assignee: UNIVERSITY OF DUNDEE
    Inventors: Edik U. Rafailov, David J. Carnegie, Grigorii Sokolovskii, Pablo Loza Alvarez, David Artigas
  • Patent number: 9184863
    Abstract: Methods and apparatus to multiplex light signals are disclosed herein. An example method includes conveying a first light signal via a first optical path and conveying a second light signal via a second optical path. The example method also includes frequency-division multiplexing and time-division multiplexing the first light signal and the second light signal to enable generation of a multiplexed light signal. The example method further includes directing the multiplexed light signal into an optical detector.
    Type: Grant
    Filed: January 8, 2013
    Date of Patent: November 10, 2015
    Assignee: Schlumberger Technology Corporation
    Inventor: Yuji Hosoda
  • Patent number: 8901477
    Abstract: According to the present invention, an electromagnetic wave detection device includes an optical waveguide, an electromagnetic wave input unit, and a phase difference measurement unit. According to the thus constructed electromagnetic wave detection device, an optical waveguide is a nonlinear crystal, and includes a branching portion for receiving a probe light pulse, and causing the probe light pulse to branch into two beams of branching light, and two branching light transmission portions for receiving the branching light from the branching portion, and transmitting the branching light. An electromagnetic wave input unit inputs an electromagnetic wave having a frequency equal to or more than 0.01 [THz] and equal to or less than 100 [THz] tilted by an angle generating Cherenkov phase matching with respect to a travel direction of the branching light into one of the two branching light transmission portions.
    Type: Grant
    Filed: September 13, 2012
    Date of Patent: December 2, 2014
    Assignee: Advantest Corporation
    Inventors: Kazunori Shiota, Akiyoshi Irisawa
  • Publication number: 20140239182
    Abstract: An inspecting device inspects an inspecting target that is a semiconductor device or a photo device. The inspecting device includes: a stage for holding an inspecting target; a femtosecond laser for emitting pulsed light; a galvano mirror for obliquely irradiating the inspecting target with the pulsed light, while changing an optical path of the pulsed light, to scan the inspecting target with the pulsed light; and a detection part for detecting an electromagnetic wave emitted non-coaxially with the pulsed light from the inspecting target in accordance with the illumination with the pulsed light.
    Type: Application
    Filed: February 27, 2014
    Publication date: August 28, 2014
    Applicants: OSAKA UNIVERSITY, DAINIPPON SCREEN MFG. CO., LTD.
    Inventors: Akira ITO, Hidetoshi NAKANISHI, Masayoshi TONOUCHI, Iwao KAWAYAMA
  • Patent number: 8759779
    Abstract: A terahertz wave generation element includes a plurality of waveguides including an electro-optic crystal, and an optical coupling member for extracting a terahertz wave to the outside. The terahertz wave is generated when light propagates through the waveguides. The waveguides are arranged to be rotationally symmetric with respect to a predetermined axis. The optical coupling member is arranged so that wave fronts of the terahertz waves generated from the waveguides are matched together.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: June 24, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kousuke Kajiki, Takeaki Itsuji, Ryota Sekiguchi
  • Patent number: 8648357
    Abstract: A radiation-emitting device includes a first active semiconductor layer embodied for the emission of electromagnetic radiation and for direct contact with connection electrodes, and a second active semiconductor layer embodied for the emission of electromagnetic radiation and for direct contact with connection electrodes. The first active semiconductor layer and the second active semiconductor layer are arranged in a manner stacked one above another.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: February 11, 2014
    Assignee: OSRAM Opto Semiconductor GmbH
    Inventor: Siegfried Herrmann
  • Patent number: 8642982
    Abstract: A fast switching arbitrary frequency light source for broadband spectroscopic applications. The light source may operate near 1.6 um based on sideband tuning using an electro-optic modulator driven by an arbitrary waveform generator. A Fabry-Perot filter cavity selects a single sideband of the light source. The finesse (FSR/??FWHM) of the filter cavity may be chosen to enable rapid frequency switching at rates up to 5 MHz over a frequency range of 40 GHz (1.3 cm?1). The bandwidth, speed and spectral purity are high enough for spectroscopic applications where rapid and discrete frequency scans are needed. Significant signal-to-noise advantages may be realized using the rapid and broadband scanning features of this system in many areas of spectroscopy, e.g., process monitoring and control, reaction dynamics, and remote sensing (e.g., greenhouse gas monitoring, biological/chemical agent screening).
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: February 4, 2014
    Assignee: The United States of America, as represented by the Secretary of Commerce, NIST
    Inventors: David F. Plusquellic, Kevin O. Douglass, Stephen E. Maxwell, Joseph T. Hodges, David A. Long, Gar-Wing Truong
  • Patent number: 8642984
    Abstract: According to the present invention, an electromagnetic wave emission device includes a nonlinear crystal having an optical waveguide; and a prism including an electromagnetic wave input surface and an electromagnetic wave transmission surface. The electromagnetic wave transmission surface includes a rotation surface which is a trajectory of a tilted line segment rotated about a central axis of the electromagnetic wave input surface, the tilted line segment being tilted with respect to the central axis. The tilted line segment and the central axis are on the same plane. The central axis is in parallel to an extending direction of the optical waveguide. The central axis passes through a projection of the optical waveguide into the electromagnetic wave input surface.
    Type: Grant
    Filed: April 15, 2013
    Date of Patent: February 4, 2014
    Assignee: Advantest Corporation
    Inventors: Kazunori Shiota, Akiyoshi Irisawa
  • Patent number: 8642983
    Abstract: An electromagnetic wave emission device includes a nonlinear crystal, a prism, and a cylindrical lens. The nonlinear crystal has an optical waveguide, receives exciting light having at least two wavelength components, and outputs an electromagnetic wave having a frequency equal to or more than 0.01 [THz] and equal to or less than 100 [THz] by means of the Cherenkov phase matching. The prism includes an electromagnetic wave input surface receiving the electromagnetic wave from the optical waveguide and an electromagnetic wave transmission surface through which the electromagnetic wave which has entered from the electromagnetic wave input surface passes. The cylindrical lens has two bottom surfaces opposed to each other, a flat surface intersecting with the two bottom surfaces, and a curved surface intersecting with the two bottom surfaces and the flat surface, wherein the flat surface is in contact with the electromagnetic wave transmission surface.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: February 4, 2014
    Assignee: Advantest Corporation
    Inventor: Kazunori Shiota
  • Publication number: 20130334424
    Abstract: A night vision system for a motor vehicle is provided. The night vision system includes an infrared-light-emitting LED assembly. The infrared-light-emitting LED assembly is adapted to emit a bundled infrared beam and has a deflecting means for periodically moving the infrared beam through a predefined solid angle range. The night vision system further includes a sensor responsive in a wavelength range of the infrared beam.
    Type: Application
    Filed: June 6, 2013
    Publication date: December 19, 2013
    Inventors: Frank LANGKABEL, Ingolf SCHNEIDER, Philipp ROECKL
  • Patent number: 8558998
    Abstract: Methods and systems are disclosed of sensing an object. A first radiation is spatially modulated to generate a structured second radiation. The object is illuminated with the structured second radiation such that the object produces a third radiation in response. Apart from any spatially dependent delay, a time variation of the third radiation is spatially independent. With a single-element detector, a portion of the third radiation is detected from locations on the object simultaneously. At least one characteristic of a sinusoidal spatial Fourier-transform component of the object is estimated from a time-varying signal from the detected portion of the third radiation.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: October 15, 2013
    Assignee: The Regents of the University of Colorado, a Body Corporate
    Inventors: Daniel Feldkhun, Kelvin H. Wagner
  • Patent number: 8373128
    Abstract: An optical ranging sensor includes an infrared LED encapsulated in a first light-permeable resin section, a light receiving device encapsulated in a second light-permeable resin section, a light-shielding resin member in contact with the first and second resin sections, a drive circuit section for driving the LED, a light receiving device control section for controlling the light receiving device, and a control section for the drive circuit section and light receiving device control section. Under control of the control section, a driving time of the LED coincides with an exposure time of the light receiving device. Further, while the LED is not driven, the light receiving device is also exposed for a time identical to the exposure time. An output difference between outputs at the exposure with driving the LED and at the exposure without driving the LED is calculated, and ranging is performed based on the output difference.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: February 12, 2013
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Akifumi Yamaguchi, Masaru Kubo
  • Publication number: 20130009061
    Abstract: An active infrared induction instrument powered by a dry battery capable of reducing power consumption through the adjustment of the emitter pulse width. The infrared emitted LED emits infrared signals, which, after being reflected by an object, are received by the infrared photodiode. The infrared signals received the infrared signals received by the infrared photodiode then enter an integrated circuit chip through a comparator. The pulse widths of the infrared emission pulse signals are dynamically adjusted after the width of the pulse series is received by the discrimination chip, thus reducing the emission power consumption to save energy.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 10, 2013
    Inventor: Chen Weigen
  • Patent number: 8304748
    Abstract: Herein is described a method for identifying semiconductor radiation detector materials based on the mobility of internally generated electrons and holes. It was designed for the early stages of exploration, when samples are not available as single crystals, but as crystalline powders. Samples are confined under pressure in an electric field and the increase in current resulting from exposure to a high-intensity source of ionization current (e.g., 60Co gamma rays) is measured. A pressure cell device is described herein to carry out the method. For known semiconductors, the d.c. ionization current depends on voltage according to the Hecht equation, and for known insulators the d.c. ionization current is below detection limits. This shows that the method can identify semiconductors in spite of significant carrier trapping. Using this method and pressure cell, it was determined that new materials BiOI, PbIF, BiPbO2Cl, BiPbO2Br, BiPbO2I, Bi2GdO4Cl, Pb3O2I2, and Pb5O4I2 are semiconductors.
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: November 6, 2012
    Assignee: The Regents of the University of California
    Inventors: Stephen E. Derenzo, Edith Bourret-Courchesne, Yetta D. Porter-Chapman, Floyd J. James, Mattias K. Klintenberg, Jie Wang, Jia-Qing Wang, legal representative
  • Patent number: 8184279
    Abstract: Methods, systems, and apparatuses are provided for measuring one or more sinusoidal Fourier components of an object. A structured second radiation is generated by spatially modulating a first radiation. The structured second radiation illuminates the object, The structured second radiation is scaled and oriented relative to the object. The object produces a third radiation in response to the illuminating. A single-element detector detects a portion of the third radiation from multiple locations on the object substantially simultaneously for each spatial modulation of the first radiation and for each orientation of the second radiation. A time-varying signal is produced based on said detected portion of the third radiations. One or more characteristics of the one or more sinusoidal Fourier components of the object are estimated based on the time-varying signal.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: May 22, 2012
    Assignee: The Regents of the University of Colorado, a Body Corporate
    Inventor: Daniel Feldkhun
  • Publication number: 20120049072
    Abstract: A terahertz wave generation element includes a plurality of waveguides including an electro-optic crystal, and an optical coupling member for extracting a terahertz wave to the outside. The terahertz wave is generated when light propagates through the waveguides. The waveguides are arranged to be rotationally symmetric with respect to a predetermined axis. The optical coupling member is arranged so that wave fronts of the terahertz waves generated from the waveguides are matched together.
    Type: Application
    Filed: August 22, 2011
    Publication date: March 1, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kousuke Kajiki, Takeaki Itsuji, Ryota Sekiguchi
  • Publication number: 20120032083
    Abstract: A terahertz wave transceiver configured to generate and detect terahertz waves based on time-domain spectroscopy includes a photoconductive device having a photoconductive film, a first electrode, and a second electrode. An excitation light illumination region is formed between the first and second electrodes. A bias applying unit applies a bias between the first electrode and the second electrode to generate the terahertz wave in the excitation light illumination region. A current detection unit detects a terahertz-wave current that is a component of a current generated in the excitation light illumination region and that is generated by an electric field of a received terahertz wave arriving from the outside. A current drawing unit draws a current originating from the bias applied by the bias applying unit. An adjustment unit determines the amount of the current drawn, based on the amount of the bias applied by the bias applying unit.
    Type: Application
    Filed: July 26, 2011
    Publication date: February 9, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Takeaki Itsuji
  • Publication number: 20110090342
    Abstract: A system and method for analyzing a sample is disclosed. At least a portion of the sample is illuminated with modulated light from a light source, such as an infrared light source. Infrared energy from the sample is monitored with an infrared detector as the sample is being illuminated with the modulated light. The AC response of the infrared energy is analyzed to determine at least one of emission data or reflection data about the sample. The emission data or the reflection data can be used to enhance chemical contrast between varying substances on the sample.
    Type: Application
    Filed: October 5, 2010
    Publication date: April 21, 2011
    Applicant: University of South Carolina
    Inventors: Michael Myrick, Heather Brooke, Megan Baranowski, Jessica McCutcheon, Stephen Morgan
  • Patent number: 7929134
    Abstract: This application describes a spectrometer that includes a set of collimating optics to collimate received EMR to produce a collimated EMR. The spectrometer also includes a first dispersive optical element for dispersing the collimated EMR and a second dispersive optical element spaced apart from the first dispersive optical element to produce further dispersed EMR. The first dispersive optical element and the second dispersive optical element cooperate to disperse received EMR into a plurality of even frequency spaced EMR spectra. The spectrometer also includes a detector positioned to receive the EMR after passing though an optical path that includes the set of collimating optics, the first dispersive optical element, the second dispersive optical element, and a set of focusing optics.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: April 19, 2011
    Assignee: Case Western Reserve University
    Inventors: Zhilin Hu, Andrew M. Rollins
  • Publication number: 20110031921
    Abstract: During rain, including a light source (5) for radiating light such that the light is transmitted through a vehicle window (2), a light receiving element (6) for sensing an optical signal when the light radiated from the light source (5) is reflected from the raindrop fallen on the vehicle window (2) and performing a photoelectric transduction, and a receiver (9) for receiving the photoelectrically transduced signal from the light receiving element (6) and judging the level of rainfall. The light source (5) and the light receiving element (6) are inclined with respect to the surface of the vehicle window (2) such that the light of the light source (5) directly reflected from the vehicle window (2) exits to the outside of the light receiving element (6) and the light reflected from a raindrop (8) on the vehicle window (2) is received by the light receiving element (6) to operate a vehicle wiper.
    Type: Application
    Filed: April 3, 2009
    Publication date: February 10, 2011
    Inventor: Sea Yeoun Han
  • Patent number: 7834905
    Abstract: The invention relates to an improved method for visualizing the environment of a vehicle, especially in the dark. The invention also relates to a night vision system, which especially provides a visual image of the environment or the digital data thereof. Preferably, the visual image is a color image which indicates the visually perceptible objects of the environment. The system also provides an infrared image of the environment or the digital data thereof. The infrared image indicates the infrared radiation radiated by the visually perceptible and/or other objections. In a preferred form of embodiment, a merged image of the visual image and the infrared image of largely identical sections of the environment of the vehicle is represented on a display comprising at least one merged region and at least one region which is not merged or not merged to the same extent or not merged with the same weighting.
    Type: Grant
    Filed: December 17, 2004
    Date of Patent: November 16, 2010
    Assignee: Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Wolfgang Hahn, Thomas Weidner
  • Publication number: 20100258727
    Abstract: Provided are an apparatus and a method which enable acquisition of a temporal waveform of a propagating terahertz wave by changing a propagation velocity of the terahertz wave. A waveform information acquisition apparatus includes a generation portion for generating a terahertz wave, a propagation portion for allowing the terahertz wave generated by the generation portion to propagate therethrough, a detection portion for detecting waveform information of the terahertz wave, a first delay portion for changing a propagation velocity of the terahertz wave, and a control portion for controlling the first delay portion to change the propagation velocity of the terahertz wave in the propagation portion, and acquires information regarding the temporal waveform of the terahertz wave detected by the detection portion.
    Type: Application
    Filed: December 25, 2008
    Publication date: October 14, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takeaki Itsuji, Shintaro Kasai
  • Publication number: 20100230599
    Abstract: An optical ranging sensor includes an infrared LED encapsulated in a first light-permeable resin section, a light receiving device encapsulated in a second light-permeable resin section, a light-shielding resin member in contact with the first and second resin sections, a drive circuit section for driving the LED, a light receiving device control section for controlling the light receiving device, and a control section for the drive circuit section and light receiving device control section. Under control of the control section, a driving time of the LED coincides with an exposure time of the light receiving device. Further, while the LED is not driven, the light receiving device is also exposed for a time identical to the exposure time. An output difference between outputs at the exposure with driving the LED and at the exposure without driving the LED is calculated, and ranging is performed based on the output difference.
    Type: Application
    Filed: December 17, 2009
    Publication date: September 16, 2010
    Inventors: Akifumi YAMAGUCHI, Masaru KUBO
  • Publication number: 20100187421
    Abstract: A rangefinder, for locating an object moving parallel to a planar surface, is rigidly attached to a carrier that is pivotably movable between an obverse position and a reverse position relative to a planar surface. Preferably, an orienting mechanism is provided for determining which position, obverse or reverse, the carrier and rangefinder are in. Preferably, a pivot, for pivoting the carrier and the rangefinder between the two positions, is rigidly attached either to the plane surface or to an attachment mechanism for reversibly attaching the carrier to the planar surface.
    Type: Application
    Filed: January 29, 2009
    Publication date: July 29, 2010
    Applicant: Pegasus Technologies Ltd.
    Inventors: Gideon SHENHOLZ, Isaac Zloter
  • Patent number: 7626169
    Abstract: A detector calibration reference is disposed along a path of travel for radiation that extends from a radiation source to a radiation detector. The detector calibration reference has mutually exclusive first and second portions that are offset in a direction transverse to the path of travel, the first portion being substantially opaque to radiation from the source, and the second portion being substantially transmissive to radiation from the source. The detector calibration reference is moved relative to the path of travel in a manner so that the first and second portions become successively aligned with the path of travel.
    Type: Grant
    Filed: June 5, 2008
    Date of Patent: December 1, 2009
    Assignee: Raytheon Company
    Inventors: Daniel B. Mitchell, Geoffrey G. Harris, Douglas J. Brown
  • Patent number: 7605370
    Abstract: A robust, compact spectrometer apparatus for determining respective concentrations or partial pressures of multiple gases in a gas sample with single as well as multiple and even overlapping, absorption or emission spectra that span a wide spectral range.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: October 20, 2009
    Assignee: RIC Investments, LLC
    Inventor: James T. Russell
  • Patent number: 7598478
    Abstract: An image pickup device wherein the range in the amount of incident light (dynamic range) for obtaining an appropriate image can be expanded, and shutter and aperture functions are provided. A light shielding element for light shielding a photoelectric conversion section and an actuator for driving the light shielding element are provided on the pixel of the image pickup device using the MEMS technology, and the amount of light shielding is controlled for each pixel, whereby the dynamic range is expanded, and shutter and aperture functions are also provided.
    Type: Grant
    Filed: April 21, 2006
    Date of Patent: October 6, 2009
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Takashi Morimoto, Naoki Kubo, Kouichi Ishida, Satoru Hirose, Takeshi Endo
  • Publication number: 20090212219
    Abstract: Provided is an infrared imaging optical system with an advantageously varying focal length across the field of view. More specifically, in a particular embodiment, provided is an inverse telephoto lens group having a field of view on the order of at least two radians. The focal length of the lens group is structured and arranged to vary in a pre-determined fashion across the field of view. An IR detector is optically coupled to the inverse telephoto lens group. A pupil is disposed between the IR detector and the inverse telephoto lens group.
    Type: Application
    Filed: February 21, 2008
    Publication date: August 27, 2009
    Inventor: Lacy G. Cook
  • Patent number: 7485849
    Abstract: A light sensor protection system and method protects a light sensor system from a laser threat. The light sensor system has a sensor housing which contains optical elements disposed within the sensor housing and at a first end of the housing to converge light rays entering the housing at a focal plane. A focal plane array is disposed within the sensor housing substantially coincident with the focal plane. A means for protecting the light sensor system from a laser threat is disposed within the housing remote from the optical elements, the light rays, and the focal plane array. The method includes the steps of (a) providing a light sensor system as described above; and (b) protecting the light sensor system from a laser threat in the presence of a laser threat or upon a warning thereof with the means for protecting the light sensor system from a laser threat.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: February 3, 2009
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Jaime Sonstroem
  • Patent number: 7339170
    Abstract: The invention features methods including: (i) modulating multiple components (e.g., different spatial regions, different wavelengths, or both) of electromagnetic (EM) radiation emerging from an object with different time-varying functions; (ii) measuring at least one time-varying signal derived from the modulated EM radiation emerging from the object; and (iii) reconstructing information about the object based on the measured signal and the time-varying functions.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: March 4, 2008
    Inventor: Shrenik Deliwala
  • Patent number: 7268352
    Abstract: The invention relates to an apparatus and a method for improved correction of drift in an infrared measuring instrument. The measurement signal furnished by a thermal detector is split into a direct voltage component and an alternating voltage component. By means of calibration curves (24, 27), a calculated comparison variable T DC , korr 900 is formed from a measured, averaged concentration value c AC1 900 . The correction value ?T for the drift correction is obtained from the difference between the corresponding measured size of the direct voltage component T DC 900 and the comparison variable T DC , korr 900 .
    Type: Grant
    Filed: June 1, 2005
    Date of Patent: September 11, 2007
    Assignee: Dragerwerk Artiengesellschaft
    Inventors: Rasmus Behring, Peter Dreyer, Horst-Dieter Hattendorff, Bernd-Michael Dicks, Hans Matthiessen
  • Patent number: 7244937
    Abstract: An optical measurement apparatus operable with a test specimen has a light source with a laser having an output beam, and a beam splitter that splits the output beam of the laser into a first split beam and a second split beam. A test specimen holder holds the test specimen therein. A first optical fiber receives the first split beam and directs the first split beam against the test specimen in the test specimen holder. The apparatus further includes an instrumentation module. A second optical fiber receives the second split beam and conducts the second split beam to the instrumentation module. A third optical fiber receives signal light from the test specimen in the test specimen holder and conducts the signal light to the instrumentation module.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: July 17, 2007
    Assignee: Raytheon Company
    Inventors: Andrew J. Gabura, Blaise R. Robitaille, Roger W. Ball
  • Patent number: 7193214
    Abstract: Parametric processing capability is added to a typical sensor so that a target object can be more clearly distinguished from the background clutter in a given scenery. A polarizer with several segments of different polarization orientations is used to improve the typical sensor. The segments are sequentially advanced to pass therethrough infrared radiation images of pre-selected polarization orientations which are then collected by respective polarized frame grabbers. Image processing circuit processes these images to yield the polarization difference between any given pair of orthogonal polarizations. In a surveillance network, the polarization differences are subsequently used in the control center, to which such sensors are connected, to enhance the distinction of the observed objects against the background clutter suspended in the propagation medium.
    Type: Grant
    Filed: April 8, 2005
    Date of Patent: March 20, 2007
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: William C. Pittman
  • Patent number: 7166842
    Abstract: A gas sensor arrangement for detecting the presence or concentration of an analyte in a measuring gas comprises a gas measuring chamber having an inlet for receiving the measuring gas. A measuring radiation source is arranged in the gas measuring chamber. The measuring radiation source emits radiation in a non-uniform pulse sequence according to a signal from a controller. A radiation detector receives the radiation emitted from the measuring radiation source. The radiation detector sends an output signal to the controller for processing.
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: January 23, 2007
    Assignees: Tyco Electronics Raychem GmbH, Bayerische Motoren Werke Aktiengesellschaft
    Inventors: Rudi Minuth, Joerg Fischer, Thomas Tille
  • Patent number: 7164131
    Abstract: Using biased, electrical power feedback to an electrical heater, the output signal from a pyroelectric detector is made to follow the waveform of incident electromagnetic radiation. The feedback power is applied to the detector to reduce the rate of change of the detector temperature that would otherwise be caused by the absorbed radiation. The combined signals from the radiation and feedback power produce a response that follows the radiation waveform with a fast rise time and with substantially less droop than previously reported. The high fidelity of the response waveform allows for a substantial simplification of the optical chopper designs and electronics needed to implement electrical calibration. In contrast to previous electrical calibration with pyroelectrics that needed very specialized electronics, with this method a variety instruments can be used for reading pyroelectric signals.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: January 16, 2007
    Inventor: Robert Joseph Phelan, Jr.
  • Patent number: 7157711
    Abstract: A robust, compact spectrometer apparatus for determining respective concentrations or partial pressures of multiple gases in a gas sample with single as well as multiple and even overlapping, absorption or emission spectra that span a wide spectral range.
    Type: Grant
    Filed: September 10, 2004
    Date of Patent: January 2, 2007
    Assignee: RIC Investments, LLC
    Inventor: James T. Russell
  • Patent number: 7141793
    Abstract: A remote sensing device for determining at least one characteristic of a vehicle emission plume includes a radiation source, a detector, and a plurality of filters. Either the filters or the detector are movable relative to the other such that different filters, each of which is capable of filtering out radiation except radiation of a predetermined wavelength band, can be used to filter the radiation directed to the detector. Also disclosed is a method for remotely determining at least one characteristic of a vehicle emission plume using a single detector and a plurality of filters wherein either the detector or the filters are positionable relative to one another.
    Type: Grant
    Filed: April 24, 2001
    Date of Patent: November 28, 2006
    Assignee: Environmental Systems Products Holdings Inc.
    Inventors: James H. Johnson, John DiDomenico
  • Patent number: 7092007
    Abstract: A vehicular forward-vision display system includes a night-vision camera for scanning a nighttime image ahead of a vehicle and a head-up display for displaying the scanned nighttime image as a virtual image on a front windshield. Luminance of the displayed image is decreased with decreasing vehicle speed. The luminance of the nighttime image is thereby decreased under a low speed where vision aid is not so necessary. This decreasing of the luminance results in giving a driver relief from the bother of being caught by the scanned image displayed on the front windshield.
    Type: Grant
    Filed: May 9, 2003
    Date of Patent: August 15, 2006
    Assignee: Denso Corporation
    Inventors: Shotaro Eguchi, Hideki Senoo, Hirokazu Takagi, Yasuo Hirayama, Yoshihiko Goto
  • Patent number: 7091488
    Abstract: Optical sensors, more particularly infrared sensors, use an array of MEM micromirrors to chop a light beam impinging on an array of sensors of an imaging device to minimize the influence of thermal noise. The array of micromirrors preferably switches the beam impinging on the array of sensors between an image to be analyzed and an image of a reference black body at a clearly defined temperature. These sensors are not cooled and require no cryogenic devices.
    Type: Grant
    Filed: June 19, 2003
    Date of Patent: August 15, 2006
    Assignee: Alcatel
    Inventor: Gilles Maurel
  • Patent number: 6995359
    Abstract: A calibration method for radiometric imaging systems that relies on an absolute measurement of scene radiance (thereby requiring a baseline measurement of zero radiance), and a shutter assembly for taking the baseline measurement of zero radiance which is operable under cryogenic temperatures as low as 80.5K (?192.65° C.) in vacuums measuring <10?6 torr (mm Hg). The shutter assembly generally includes an actuator and a shutter mechanism. The actuator is preferably a miniature solenoid assembly capable of operation in extreme environments (e.g. vacuums of <10?6 torr, temperatures below 90K). The shutter mechanism preferably includes a single shutter blade and is also capable of operation when subjected to extreme environments. The method of using the shutter assembly provides a zero radiance reference measurement for an infrared imaging system, thereby providing a basis upon which absolute scene radiance may be determined.
    Type: Grant
    Filed: June 11, 2003
    Date of Patent: February 7, 2006
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Eric A. Hillenbrand, Roy Luoma, R. Kyle Webb
  • Publication number: 20040238741
    Abstract: A continuously variable diaphragm or swappable fixed aperture for use in thermal infrared cameras, which aperture or diaphragm can be cooled to cryogenic temperatures. The invention contemplates mounting aperture control means, if necessary, in a vacuum or extending the control mechanism through a vacuum in a thermally isolated manner to avoid radiation load on the photocell. The inventive method implements such a diaphragm and control system. The invention makes possible the object of using a single thermal infrared camera under a wide variety of target-scene radiation conditions that may be rapidly changing, with interchangeable or zoom camera lenses requiring matching or different size cold stops, and under other such dynamic situations.
    Type: Application
    Filed: May 28, 2003
    Publication date: December 2, 2004
    Applicant: OPTO-KNOWLEDGE SYSTEMS, INC.
    Inventors: Nahum Gat, John Dwight Garman
  • Patent number: 6813063
    Abstract: A waveguide having a periodic structure and the excitation of exciton polariton as one form of interactions between radiation fields and matter systems are applied to light switching to provide an optical switch that is excellent in light intensity extinction ratio and operable at a speed in the terahertz order. The optical switch includes a polariton and photon interacting region (5) made of a grating (3) formed on a top face of a transparent substrate (2) and a semiconductor layer (4) with which the grating (3) is covered. The polariton and photon interacting region (5) is irradiated from a free space with a controllable light (7) having a preestablished wavelength and also from a free space with a control light (6) having a preselected wavelength to control the transmissivity of the controllable light (7) through the polariton and photon interacting region (5).
    Type: Grant
    Filed: February 13, 2003
    Date of Patent: November 2, 2004
    Assignees: Japan Science and Technology Agency, Riken
    Inventor: Teruya Ishihara
  • Patent number: 6800856
    Abstract: A light sampling system for sampling scattered light from mirrors in an optical switch. The system includes four basic components: an imaging lens, a multi-channel liquid crystal light valve (LCLV), a collecting lens, and a light sensor. Light scattered by each mirror, is collected by the imaging lens, which re-images the light onto the LCLV. The LCLV is divided into multiple regions, one for each mirror to be monitored. Each region can independently be made opaque (“closed”) or transparent (“open”) to light reaching it. Light passing through all open regions of the LCLV is collected by the collecting lens, which focuses the light onto the light sensor. The light sensor registers a response to light passing through the LCLV. Each region of the LCLV can be programmed to be open or closed for any length of time, in any combination or sequence with any other region or regions, depending upon how the user wishes to monitor the scattered light.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: October 5, 2004
    Assignee: Trey Enterprises Corp.
    Inventor: Donald Bruns
  • Patent number: 6791086
    Abstract: A robust, compact spectrometer apparatus for determining respective concentrations or partial pressures of multiple gases in a gas sample with single as well as multiple and even overlapping, absorption or emission spectra that span a wide spectral range.
    Type: Grant
    Filed: August 23, 2002
    Date of Patent: September 14, 2004
    Assignee: Respironics, Inc.
    Inventor: James T Russell
  • Publication number: 20040155195
    Abstract: Optical sensors, more particularly infrared sensors, use an array of MEM micromirrors to chop a light beam impinging on an array of sensors of an imaging device to minimize the influence of thermal noise. The array of micromirrors preferably switches the beam impinging on the array of sensors between an image to be analyzed and an image of a reference black body at a clearly defined temperature. These sensors are not cooled and require no cryogenic devices.
    Type: Application
    Filed: June 19, 2003
    Publication date: August 12, 2004
    Applicant: ALCATEL
    Inventor: Gilles Maurel
  • Patent number: 6770882
    Abstract: This invention is a micromachined sensor pixel structure that can be fabricated either as a discrete sensor or in array form with application to thermal sensing of radiation receive from various wavelength emitters. The transmissivity of a thermally-isolated microplatform is a sensitive function of temperature. This transmissivity is modulated by incident radiation from sources including infrared sources. The transmissivity of a micromachined structure is interrogated by means of an optical carrier. Readout is obtained by means of conventional silicon optical sensors or imagers. A multiplicity of micromachined pixels can be tailored for specific wavelengths permitting the array to operate as a multispectral imager with windows ranging from ultraviolet to millimeter wavelengths.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: August 3, 2004
    Assignee: Multispectral Imaging, Inc.
    Inventors: William Carr, Dadi Setiadi