With Light Attenuation Patents (Class 356/370)
  • Patent number: 10726241
    Abstract: A total internal reflection based imaging system may include a light transmitting member having an imaging surface. A pressure sensitive membrane may be arranged on the imaging surface. The pressure sensitive membrane may include a top surface, a bottom surface, and an elastic deformable film forming at least a portion of the top surface. The imaging system may include a textured surface disposed between the pressure sensitive membrane and the imaging surface. An application of pressure on the top surface may deform the deformable film to reduce a distance between the deformable film and the imaging surface. A light source may be configured to emit a light towards the imaging surface such that reduced total internal reflection of the light occurs where the bottom surface of the pressure sensitive membrane contacts the imaging surface. A sensor may be configured to capture the light reflected from the imaging surface.
    Type: Grant
    Filed: April 5, 2016
    Date of Patent: July 28, 2020
    Assignee: Identification International, Inc.
    Inventors: Bryan D. Dickerson, Richard K. Fenrich, Christopher R. Robinson, William B. Cowen, Jr.
  • Patent number: 10241030
    Abstract: An optical spectrometer includes a near black body light source, a reference detector in a first optical path and a single measurement detector in a second optical path. A sample cell including a fluid flow line may be positioned in the second optical path upstream of the measurement detector. Optical energy may be emitted at a plurality of filament temperatures and first and second sets of optical intensities measured at the reference and measurement detectors. The first and second sets of optical intensities may be processed to compute a substantially continuous transmittance spectrum of a fluid sample in the fluid flow line by inverting the acquired optical intensity measurements.
    Type: Grant
    Filed: November 30, 2012
    Date of Patent: March 26, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Kentaro Indo, Kai Hsu, Julian Pop
  • Patent number: 10200597
    Abstract: A method and an apparatus for photographing using a portable terminal are provided. The apparatus includes an interface for intuitively identifying different photographing compositions in a preview mode and supports photographing a subject according to each composition selected by a user in the interface. The method includes driving a camera module and displaying a plurality of images in a multi-preview window corresponding to a plurality of compositions.
    Type: Grant
    Filed: January 22, 2014
    Date of Patent: February 5, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hongsuk Choi, Moonsoo Kim
  • Patent number: 10168274
    Abstract: This disclosure is generally directed to systems for imaging polarization properties of optical-material samples. As one aspect, there is provided a system for precise, simultaneous imaging of both the in-plane and out-of-plane birefringence properties of sample material over a wide range of incidence angles. The spatially resolved imaging approach described here is amenable to determination of a wide range of polarimetric properties, in addition to the in-plane and out-of-plane birefringence measure discussed as a preferred embodiment.
    Type: Grant
    Filed: June 2, 2017
    Date of Patent: January 1, 2019
    Assignee: Hinds Instrumsnts, Inc.
    Inventors: John Freudenthal, Andy Leadbetter, Baoliang Wang
  • Patent number: 10018686
    Abstract: An ultra-low noise sensor for magnetic fields comprises a mechanically resonant structure having a magnetized proof mass. The displacement of the proof mass due to a magnetic field provides a high resolution and highly amplified measurement of magnetic field fluctuations near the resonance frequency. A flux modulator may be used with the resonant structure to amplify magnetic fluctuations in a non-resonant frequency band. The resonant structure, combined with a high resolution readout device and a frequency-compensating numerical processor, can amplify magnetic fluctuations in a broad range of frequencies. A solenoid coil surrounding the resonant structure may be used to null the quasi-static earth's magnetic field and thereby increase the dynamic range of the sensor. Cryogenically cooling the resonant structure can improve the resolution of the sensor. A magnetometer that embodies features of the present invention is miniaturized and has improved amplification and resolution at room temperature.
    Type: Grant
    Filed: October 21, 2015
    Date of Patent: July 10, 2018
    Assignee: THE CHARLES STARK DRAPER LABORATORY, INC.
    Inventors: James Alan Bickford, Jonathan Jay Bernstein, Marc Steven Weinberg, Amy Elizabeth Duwel, Richard David Elliott, III, Ronald Edmund Gagnon, Jr., Joseph Michael Kinast, John Joseph LeBlanc, Thomas Francis Marinis, Jr., Michael Joseph Tomaino-Iannucci, William Joseph Trinkle, Jr.
  • Patent number: 9310294
    Abstract: Methods and systems are provided for monitoring at least one gas in a sample gas. An exemplary system includes a source used for generating a beam of radiation, at least one retro-reflector configured to receive the beam of radiation from the source in an incident direction and reflect the beam of radiation toward the source in alignment with the incident direction, and a motor configured to move the at least one retro-reflector with respect to the source in a direction collinear with the incident direction. The system also includes a sample cell storing a sample gas comprising at least one gas. The sample cell is configured to allow at least a portion of an extracted beam of radiation from a cavity, defined by the source and the at least one retro-reflector, to propagate therethrough.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: April 12, 2016
    Assignee: MKS Instruments, Inc.
    Inventor: Robert M. Carangelo
  • Patent number: 9047605
    Abstract: A fingerprint analysis device is presented including a sensing mechanism including an adhesive member configured to perform at least a chemical analysis of a fingerprint and a sound emitting mechanism for emitting one or more sounds based on the chemical analysis of the fingerprint. The chemical analysis device further performs on-the-spot, substantially instantaneous chemical analysis of received fingerprints and emits or conveys audible and/or non-audible information based on the fingerprints received.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: June 2, 2015
    Inventor: Theodosios Kountotsis
  • Publication number: 20150138554
    Abstract: A system for page detection using light attenuators is applied in a book to detect an opened page of the book. The book has N pages and each page has a page detection area in which at most M light attenuators are installed in each page detection area. A light source passes through the at most M light attenuators for attenuating intensity of the light source. M light sensing devices are installed in an area of the book that corresponds to the page detection area. The M light sensing devices are used to detect attenuated intensities of the light source. A controller is connected to the M light sensing devices for detecting the opened page based on a ratio of the intensities of the light source detected by the M light sensing devices on each page.
    Type: Application
    Filed: July 25, 2014
    Publication date: May 21, 2015
    Inventors: Li-Shang LO, Tung-Tsai LIAO
  • Publication number: 20150131097
    Abstract: A method of determining the relative concentrations of enantiomeric forms of a compound in an enantiomeric mixture includes combining the enantiomeric mixture with carbon nanotubes or graphene to form a carbon-enantiomer mixture, exposing the mixture to a monochromatic polarized light, and analyzing reflected polarized light from the mixture using a differential analyzer.
    Type: Application
    Filed: November 12, 2014
    Publication date: May 14, 2015
    Inventors: Anjan Kr. DASGUPTA, Tamoghna BHATTACHARYYA, Sarita ROY
  • Publication number: 20150077752
    Abstract: An apparatus and method for determining the concentration of chiral molecules in a fluid includes a first polarizer configure to polarize light in substantially a first plane to provide initially polarized light. A second polarizer is capable of polarizing the initially polarized light in a plurality of planes, at least one of the plurality of planes being different from the first plane, to provide subsequently polarized light. One or more receivers are included for measuring an intensity of the subsequently polarized light in one or more of the plurality of planes.
    Type: Application
    Filed: November 21, 2014
    Publication date: March 19, 2015
    Inventor: Jacob W. Scarpaci
  • Patent number: 8976354
    Abstract: An optical apparatus has a light detecting section which detects light and emits transmitted light where linearly polarized light, which is converted by a polarizing section, is transmitted through a subject. In addition, the optical apparatus has an orthogonal separating section which orthogonally separates the emitted light from the light detecting section and a light reception section which receives light which is orthogonally separated by the orthogonal separating section. A calculation apparatus outputs a rotation control signal to a rotation apparatus and rotation controls the light detecting section so that the rotation plane is orthogonal with regard to an optical path of the transmitted light. Then, the calculation apparatus measures the polarization state of the transmitted light, which is transmitted through the subject S using the intensity with which the light, is received by the light receiving section.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: March 10, 2015
    Assignee: Seiko Epson Corporation
    Inventors: Hideaki Yamada, Michihiro Nagaishi
  • Patent number: 8922772
    Abstract: A multichannel optical system including a mixing device responsive to a sample beam and a reference beam that provides an in-phase signal including the mixed sample beam and reference beam having a relative phase of 0° and a quadrature phase signal including the mixed sample beam and reference beam having a relative phase of 90°. The system also includes a photodetector responsive to the quadrature phase signal that converts the quadrature phase signal to a quadrature phase electrical signal. A polarization demultiplexer circuit receives the quadrature phase electrical signal and measures the amplitude of a unique time-dependent phase dither profile having a zero time-averaged mean and a zero time-averaged correlation to the other phase dither profiles and provides a polarization amplitude signal. A polarization controller receives the polarization amplitude signal and controls the reference beam to maximize the polarization amplitude signal.
    Type: Grant
    Filed: October 29, 2012
    Date of Patent: December 30, 2014
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Gregory D. Goodno, Mark E. Weber, Stanley Benjamin Weiss, IV
  • Patent number: 8810792
    Abstract: A beam sampling system, includes a first beam splitter adapted to split a laser beam having a primary polarization component and a secondary polarization component, into a first intermediate sample beam, and a first beam splitter output beam, the intermediate sample beam including first percentage of the primary polarization component and a second percentage of the secondary polarization component. A 90-degree polarization rotator is positioned in the intermediate sample beam line. A second beam splitter is mounted so that the intermediate sample beam is split into an output sample beam on an output sample beam line, and a second transmitted beam, the output sample beam including substantially said first percentage of the secondary polarization component and substantially said second percentage of the primary polarization component.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: August 19, 2014
    Assignee: Metal Improvement Company, LLC
    Inventors: C. Brent Dane, Edward W. H. Lao, Scott N. Fochs
  • Patent number: 8780347
    Abstract: A spectroscopy system comprising at least two laser modules, each of the laser modules including a laser cavity, a quantum cascade gain chip for amplifying light within the laser cavity, and a tuning element for controlling a wavelength of light generated by the modules. Combining optics are used to combine the light generated by the at least two laser modules into a single beam and a sample detector detects the single beam returning from a sample.
    Type: Grant
    Filed: June 13, 2011
    Date of Patent: July 15, 2014
    Assignee: Block Engineering, LLC
    Inventors: Petros Kotidis, Erik Deutsch, Ninghui Zhu, Dan Cavicchio
  • Patent number: 8760653
    Abstract: A unit for measuring a power of randomly polarized light beam is configured with spaced first and second beam splitters having respective reflective surfaces which face one another and configured to sequentially reflect a fraction of randomly polarized beam which is incident upon the first splitter. The beam splitters are dimensioned and shaped so that an output beam, reflected from the second beam splitter, has a power independent from the state of polarization of the randomly polarized beam.
    Type: Grant
    Filed: October 19, 2009
    Date of Patent: June 24, 2014
    Assignee: IPG Photonics Corporation
    Inventors: Alexey M. Mamin, Vladimir Zuev
  • Publication number: 20140168646
    Abstract: An optical system is presented for use in measuring in patterned structures having vias. The optical system comprises an illumination channel for propagating illuminated light onto the structure being measured; a detection channel for collecting light returned from the illuminated structure to a detection unit; and an attenuation assembly accommodated in the illumination and detection channels and being configured and operable for selectively attenuating light propagating along the detection channel, the attenuation creating a predetermined condition for the selectively attenuated light, said predetermined condition being defined by a predetermined ratio between a first light portion corresponding to a dark field condition and a second light portion corresponding to a bright field condition in said selectively attenuated light, detected selectively attenuated light being therefore indicative of at least one parameter of the via being illuminated.
    Type: Application
    Filed: July 18, 2012
    Publication date: June 19, 2014
    Applicant: NOVA MEASURING INSTRUMENTS LTD.
    Inventors: Gilad Barak, Boaz Brill
  • Patent number: 8724099
    Abstract: An object of the present invention is to provide a device which detects matter suspended in air, represented by, for example, ice crystals, volcanic ash, in the forward direction of the flight of an aircraft. A method of detecting matter suspended in air of this invention is characterized in that, in airborne Doppler LIDAR using laser light, components of matter subjected to laser light reflection and scattering are remotely measured on a basis of an angular difference in planes of polarization of transmitted light which is laser light radiated into the atmosphere, and received light scattered by matter suspended in air in a remote region.
    Type: Grant
    Filed: January 4, 2012
    Date of Patent: May 13, 2014
    Assignee: Japan Aerospace Exploration Agency
    Inventors: Takashi Asahara, Hamaki Inokuchi, Kazuhiro Asai
  • Patent number: 8625093
    Abstract: Provided is a particle characterization device that can ensure measurement accuracy even though light detecting means has a single configuration, and enables the number of optical elements to be decreased as much as possible to suppress cost increase and reduce the number of adjustment places, and the particle characterization device has an incident side polarizer and an incident side ¼ wavelength plate as an illumination optical system mechanism and, as a light receiving optical system mechanism, an exit side ¼ wavelength plate and an exit side polarizer that can be rotated to a plurality of angle positions around a cell, wherein light attenuating means that prevents a polarization state from being changed is provided on a light path, and a light attenuation rate by the light attenuating means is controlled such that a detected light intensity at each measurement position falls within a measurement range of light detecting means.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: January 7, 2014
    Assignee: Horiba, Ltd.
    Inventors: Tetsuji Yamaguchi, Tatsuo Igushi, Takuji Kurozumi
  • Patent number: 8625095
    Abstract: There is provided an automatic inspection apparatus and method for detecting stains on a polarizing plate using color difference analysis. The automatic inspection apparatus includes an inspection unit including at least one reference polarizing plate and a target polarizing plate or polarizing element mounted on the at least one reference polarizing plate; a light source unit disposed on one surface of the inspection unit and irradiating the inspection unit with light; an imaging unit disposed on the other surface of the inspection unit, imaging the target polarizing plate or polarizing element, and transferring an image thereof; and an arithmetic operation unit performing color difference analysis for individual inspection regions of the image of the target polarizing plate or polarizing element transferred by the imaging unit and detecting a blurred stain.
    Type: Grant
    Filed: April 26, 2012
    Date of Patent: January 7, 2014
    Assignee: LG Chem, Ltd.
    Inventors: Chong-Kun Lee, Kyun-Il Rah, Tae-Hun Kim, Yoo-Min Lee, Sang-Deok Lee
  • Patent number: 8582101
    Abstract: Improving the throughput of systems for measuring birefringence of optical samples includes techniques for directing multiple beams through the photoelastic modulator component of the system so that, along with expanded detection mechanisms to accommodate the multiple beams, the heretofore scanning (via a single beam) of a line across the sample is considerably enlarged so that several lines covering a “swath” of the sample area is scanned by the system of the present invention.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: November 12, 2013
    Assignee: Hinds Instruments, Inc.
    Inventor: Baoliang Wang
  • Publication number: 20130265577
    Abstract: Methods and systems for variable polarization wafer inspection are provided. One system includes one or more polarizing components position in one or more paths of light scattered from a wafer and detected by one or more channels of an inspection system. The polarizing component(s) are configured to have detection polarization(s) that are selected from two or more polarization settings for the polarizing component(s).
    Type: Application
    Filed: April 5, 2013
    Publication date: October 10, 2013
    Applicant: KLA-Tencor Corporation
    Inventors: Xianzhao Peng, Mark Shi Wang, Grace Hsiu-Ling Chen
  • Publication number: 20130148119
    Abstract: An apparatus and method for determining the concentration of chiral molecules in a fluid includes a first polarizer configure to polarize light in substantially a first plane to provide initially polarized light. A second polarizer is capable of polarizing the initially polarized light in a plurality of planes, at least one of the plurality of planes being different from the first plane, to provide subsequently polarized light. One or more receivers are included for measuring an intensity of the subsequently polarized light in one or more of the plurality of planes.
    Type: Application
    Filed: February 4, 2013
    Publication date: June 13, 2013
    Applicant: DEKA Products Limited Partnership
    Inventor: DEKA Products Limited Partnership
  • Publication number: 20120170037
    Abstract: The present invention is directed to a novel multi-spectral exogenous fluorescence polarization imaging technique that enables rapid imaging of large tissue fields. The imaging device includes a tunable monochromatic light source and a CCD camera. Linear polarizers are placed into both the incident and collected light pathways in order to obtain fluorescence polarization or/and anisotropy image. To acquire exogenous fluorescence image, fluorescent contrast agents are delivered to a target tissue.
    Type: Application
    Filed: January 13, 2012
    Publication date: July 5, 2012
    Applicant: The General Hospital Corporation
    Inventors: Anna N. Yaroslavsky, Richard R. Anderson
  • Publication number: 20120113424
    Abstract: Light from light source means (a wavelength-variable laser) is applied to a surface of a hydrogen absorbing thin metal film of a hydrogen detecting surface plasmon resonator including a surface plasmon resonance enhancement structure formed by providing in the thin film an array of periodic holes having a shape that is not 90-degree rotational symmetric in the plane of the film surface, and transmitted light is detected with light detecting means (a photometer). Hydrogen is detected on the basis of a change in light transmission frequency characteristic caused by hydrogen absorption in the hydrogen detecting surface plasmon resonator. Optical hydrogen detection that is highly safe and unaffected by variations in the amount of light from the light source and stray light can be achieved.
    Type: Application
    Filed: September 1, 2010
    Publication date: May 10, 2012
    Applicants: University of Tokyo, Japan Aviation Electronics Industry Limited
    Inventors: Atsushi Suda, Jean-Jacques Delaunay, Etsuo Maeda, Ichiro Yamada
  • Patent number: 8154715
    Abstract: A method for measuring and monitoring the state of polarization (SOP) of a polarization maintaining (PM) fiber using a narrowband fiber Bragg grating (FBG) written on the same is provided. The PM fiber comprises a first narrowband reference FBG which is used as a reference to measure and monitor the SOP of the PM fiber. Due to the birefringence properties of the PM fiber, the reference FBG typically reflects two narrowband spectra, each having a central wavelength; one in the slow axis and one in the fast axis. By measuring the intensity of the reflected spectra in each axis and by tuning the fiber with a polarization controller, it is possible to adjust the fiber to a predetermined SOP. Accurate measures of optical properties (e.g. reflectivity) of optical devices (e.g. a FBG grating), according to the predetermined SOP, are possible.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: April 10, 2012
    Assignee: ITF Laboratories Inc.
    Inventors: Changzun Zhou, Yunfei Zhao
  • Patent number: 8107078
    Abstract: A detecting device of unevenness of a glass substrate includes a light source emitting a light; a polarizer polarizing the light; a standard cell including opposing outer surfaces, the glass substrate attached to one of the opposing outer surfaces, the polarized light passing through the standard cell and the glass substrate; an analyzer detecting and analyzing the light passing through the standard cell and the glass substrate.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: January 31, 2012
    Assignee: LG Display Co., Ltd.
    Inventors: Kum-Mi Oh, Yong-Won Zeon
  • Patent number: 8058608
    Abstract: A device for imaging scenes with a very large range of intensity having a pair of polarizers, a primary lens, an attenuating mask, and an imaging device optically connected along an optical axis. Preferably, a secondary lens, positioned between the attenuating mask and the imaging device is used to focus light on the imaging device. The angle between the first polarization direction and the second polarization direction is adjustable.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: November 15, 2011
    Assignee: The United States of America as represented by the Department of Energy
    Inventor: Vance Albert Deason
  • Patent number: 8045163
    Abstract: The present invention relates to methods for manufacturing polarization sensitive respectively polarizing filters and to their application to polarizing photosensors used to measure the polarization of incident light, further to designs of polarization sensors measuring angles of rotation and strong electric or magnetic fields as well as to reproducing polarization equipment reproducing polarized signals or to reproduce independent signals.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: October 25, 2011
    Inventor: Gunter Grau
  • Publication number: 20110255088
    Abstract: A beam sampling system, includes a first beam splitter adapted to split a laser beam having a primary polarization component and a secondary polarization component, into a first intermediate sample beam, and a first beam splitter output beam, the intermediate sample beam including first percentage of the primary polarization component and a second percentage of the secondary polarization component. A 90-degree polarization rotator is positioned in the intermediate sample beam line. A second beam splitter is mounted so that the intermediate sample beam is split into an output sample beam on an output sample beam line, and a second transmitted beam, the output sample beam including substantially said first percentage of the secondary polarization component and substantially said second percentage of the primary polarization component.
    Type: Application
    Filed: March 2, 2011
    Publication date: October 20, 2011
    Applicant: METAL IMPROVEMENT COMPANY LLC
    Inventors: C. BRENT DANE, Edward W.H. LAO, Scott N. FOCHS
  • Publication number: 20110181883
    Abstract: Improving the throughput of systems for measuring birefringence of optical samples includes techniques for directing multiple beams through the photoelastic modulator component of the system so that, along with expanded detection mechanisms to accommodate the multiple beams, the heretofore scanning (via a single beam) of a line across the sample is considerably enlarged so that several lines covering a “swath” of the sample area is scanned by the system of the present invention.
    Type: Application
    Filed: July 2, 2009
    Publication date: July 28, 2011
    Applicant: HINDS INSTRUMENTS, INC.
    Inventor: Baoliang Wang
  • Patent number: 7922337
    Abstract: The invention relates to a method for establishing a light beam (CLB) with substantially constant luminous intensity comprising the steps of establishing a light beam (LB) by means of a light source (SAL) and controlling an attenuation of said light beam (LB) on the basis of occurrences of luminous intensity peaks (IP) in said light beam (LB).
    Type: Grant
    Filed: March 16, 2004
    Date of Patent: April 12, 2011
    Assignee: Sign-Tronic AG
    Inventor: Henrik Glent-Madsen
  • Patent number: 7920253
    Abstract: In a method of measuring cumulative polarization mode dispersion (PMD) along the length of a fiber-under-test (FUT), a polarization-sensitive optical time domain reflectometer (POTDR) is used to inject into the FUT plural series of light pulses arranged in several groups. Each group comprises at least two series having closely-spaced wavelengths and the same state of polarization (SOP). At least two of such groups are injected and corresponding OTDR traces obtained for each series by averaging the impulse-response signals of the several series in the group. The process is repeated for a number of groups. The PMD is obtained by normalizing the OTDR traces of all of the groups, then computing the difference between each normalized OTDR trace in one group and the corresponding normalized OTDR trace in another group, followed by the mean-square value of the differences. Finally, the PMD is computed as a predetermined function of the mean-square difference.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: April 5, 2011
    Assignee: EXFO Inc.
    Inventors: Normand Cyr, Hongxin Chen
  • Patent number: 7911611
    Abstract: An optical system of an atomic oscillator that regulates an oscillation frequency by using an optical absorption property by one of a double resonance method utilizing light and micro waves and a coherent population trapping (CPT) method utilizing a quantum interference effect produced by two kinds of resonance light, includes: a light source emitting the resonance light; a gas cell disposed at an emitting side of the light source, sealing a gaseous metal atom therein and transmitting the resonance light through a metal atom gas; a light detecting unit detecting the transmitted light that is transmitted through the metal atom gas; and a fluorescence blocking unit blocking at least a part of fluorescence, which is emitted from the metal atom gas to the light detecting unit, and disposed between the metal atom gas and the light detecting unit.
    Type: Grant
    Filed: June 23, 2009
    Date of Patent: March 22, 2011
    Assignee: Epson Toyocom Corporation
    Inventor: Koji Chindo
  • Publication number: 20110063617
    Abstract: It is an object of the present invention to solve the above-mentioned problems by using an optical arrangement that is totally different from the conventional CD spectra measuring method, and to provide a method and device for measuring circular dichroism spectra, which can measure the CD spectrum in much shorter time even with the use of a small light source. The method for measuring circular dichroism spectra according to the present invention comprising the steps of irradiating a white light projected from a white light source to a sample without dispersing the light into a monochromatic light, dispersing the light output from the sample, detecting a light intensity of the dispersed light by a detector having a sensor consisting of a charge-coupled device, and then measuring a circular dichroism spectrum of the sample on the basis of a result of the detection by the detector (FIG. 1).
    Type: Application
    Filed: April 3, 2009
    Publication date: March 17, 2011
    Inventors: Hiromi Takahashi, Reiko Kuroda, Takunori Harada
  • Patent number: 7830511
    Abstract: A polarization direction measuring apparatus includes: a first polarizing plate having an unknown polarization direction about a reference axis; a sample whose polarization direction is to be measured; a rotatable sample holder on which the sample is mounted in a first direction and a second direction opposite to the first direction, wherein the sample holder rotates the sample along a reference axis in the azimuth direction; a light source that generates light passing though the first polarizing plate and the sample; and a light detector detecting light generated by the light source that passes though the first polarizing plate and the sample.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: November 9, 2010
    Assignee: LG Display Co., Ltd.
    Inventors: Yong Sung Ham, Jong Won Moon, Jin Kwan Jeong
  • Patent number: 7821637
    Abstract: Disclosed is a system for controlling focus, angle of incidence and intensity of an electromagnetic beam over a spectrum of wavelengths, and methodology for optimizing investigation of samples which demonstrate low specular reflectance and/or are depolarizing of a polarized beam of electromagnetic radiation, such as solar cells.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: October 26, 2010
    Assignee: J.A. Woollam Co., Inc.
    Inventors: Galen L. Pfeiffer, Martin M. Liphardt, James N. Hilfiker
  • Patent number: 7791724
    Abstract: The illumination profile of a radiation beam is initially measured using a CCD detector. A reference mirror is then placed in the focal plane of the high aperture lens and the reflected radiation measured. By comparing the illumination profile and the detected radiation it is possible to determine the transmission losses for S and P polarisation which can then be used in scatterometry modeling.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: September 7, 2010
    Assignee: ASML Netherlands B.V.
    Inventors: Arie Jeffrey Den Boef, Wilhelmus Maria Corbeij, Mircea Dusa, Markus Gerardus Martinus Van Kraaij
  • Patent number: 7705986
    Abstract: A sensor unit for measuring a response characteristic of a polarization rotation liquid crystal cell, includes a measurement light source which emits measurement light, a first polarization plate which has a first polarization direction and receives the measurement light from the measurement light source to output measurement light having the first polarization direction to a polarization rotation liquid crystal cell, a second polarization plate which has a second polarization direction and receives measurement light passed through the polarization rotation liquid crystal cell, a light receiving unit which receives measurement light passed through the second polarization plate, and a measurement unit which determines a response characteristic of the polarization rotation liquid crystal cell on the basis of a drive signal of the polarization rotation liquid crystal cell and the amount of measurement light received by the light receiving unit.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: April 27, 2010
    Assignee: Olympus Corporation
    Inventors: Kazuya Yamanaka, Susumu Kobayashi, Kensuke Ishii
  • Patent number: 7705985
    Abstract: The present disclosure relates to a method for measuring the maturity or cell wall thickening of a sample of cellulosic fiber. The method at least includes exposing the sample of fiber to polarized light, capturing one or more images of the sample through crossed polar lenses and a compensator plate so that the image(s) include interference colors from the sample; and conducting computer analysis on the captured image(s) to determine the maturity or degree of cell wall thickening of the cellulosic fiber by comparing the image(s) to reference color interference data.
    Type: Grant
    Filed: January 20, 2005
    Date of Patent: April 27, 2010
    Assignee: Commonwealth Scientific and Industrial Research Organisation
    Inventors: Stuart Lucas, Stuart Gordon, Nicole Phair-Sorensen
  • Patent number: 7671989
    Abstract: Maintenance of information content in a focused beam of electromagnetic radiation when the intensity thereof is attenuated by application of an aperture-like element.
    Type: Grant
    Filed: June 18, 2008
    Date of Patent: March 2, 2010
    Assignee: J. A. Woollam Co., Inc.
    Inventors: Martin M. Liphardt, Ping He
  • Publication number: 20100002231
    Abstract: An optical system of an atomic oscillator that regulates an oscillation frequency by using an optical absorption property by one of a double resonance method utilizing light and micro waves and a coherent population trapping (CPT) method utilizing a quantum interference effect produced by two kinds of resonance light, includes: a light source emitting the resonance light; a gas cell disposed at an emitting side of the light source, sealing a gaseous metal atom therein and transmitting the resonance light through a metal atom gas; a light detecting unit detecting the transmitted light that is transmitted through the metal atom gas; and a fluorescence blocking unit blocking at least a part of fluorescence, which is emitted from the metal atom gas to the light detecting unit, and disposed between the metal atom gas and the light detecting unit.
    Type: Application
    Filed: June 23, 2009
    Publication date: January 7, 2010
    Applicant: EPSON TOYOCOM CORPORATION
    Inventor: Koji CHINDO
  • Publication number: 20090303481
    Abstract: An optical component including a protective film laminated on its front side and a separator on its back side, of which the front or back is easily identified, a front/back identifying method for the component, which is simple, and neither hinders other inspections nor destroys/scratches the component, and a front/back identifying device for the component. Using the device including an analyzer 6 for an optical component 1 configured such that when a crossed Nicols arrangement is formed between the component 1 and the analyzer 6, an amount or a hue of light transmitting through the arrangement when placed in the arrangement is a protective film 3 differs from that when placed therein is a separator 5, the front or back of the component 1 is identified by observing the light to identify which film is placed in the arrangement based on the amount or the hue of the light.
    Type: Application
    Filed: October 20, 2006
    Publication date: December 10, 2009
    Inventor: Nobuhiko Nakai
  • Patent number: 7619736
    Abstract: A sample information obtaining apparatus includes an electromagnetic wave generator; a sample holding unit which holds a sample to be tested and serves as a polarizer having a polarization axis which defines how an incident electromagnetic wave is to be divided according to a polarization state of the incident electromagnetic wave; an electromagnetic wave detecting unit which separately detects a transmitted electromagnetic wave transmitted through the sample holding unit and a reflected electromagnetic wave reflected off the sample holding unit, the transmitted and reflected electromagnetic waves being obtained by dividing the incident electromagnetic wave incident on the sample holding unit according to a relative positional relationship between the polarization state of the incident electromagnetic wave and the polarization axis of the sample holding unit; and a processor which processes signals of the electromagnetic waves detected by the electromagnetic wave detecting unit and obtains information about t
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: November 17, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takeaki Itsuji
  • Publication number: 20090231700
    Abstract: An ellipsometer or polarimeter system and method for controlling intensity of an electromagnetic beam over a spectrum of wavelengths by applying control (P2) and beam (P) polarizers, optionally in combination with an intervening and control compensator (C).
    Type: Application
    Filed: March 14, 2008
    Publication date: September 17, 2009
    Inventors: Galen L. Pfeiffer, Martin M. Liphardt
  • Patent number: 7586083
    Abstract: Presented herein is a non-contact torque sensing apparatus and method for measuring the instantaneous torque, or torsional stress/strain, transmitted through an elongated power transmission member such as a rotatable shaft. Polarized light is directed along a measurement light path in a cavity of a shaft where it intercepts a polarizing filter. The polarizing filter is operable to alter the polarization angle of the light according to torsional twisting of the shaft. A measurement device measures the change in the polarization angle of the light to obtain the shaft twist angle. Shaft torque is then calculated from the twist angle.
    Type: Grant
    Filed: December 7, 2007
    Date of Patent: September 8, 2009
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Hamid Vahabzadeh, Ayoub Chakari
  • Publication number: 20090219531
    Abstract: A detecting device of unevenness of a glass substrate includes a light source emitting a light; a polarizer polarizing the light; a standard cell including opposing outer surfaces, the glass substrate attached to one of the opposing outer surfaces, the polarized light passing through the standard cell and the glass substrate; an analyzer detecting and analyzing the light passing through the standard cell and the glass substrate.
    Type: Application
    Filed: December 15, 2008
    Publication date: September 3, 2009
    Inventors: Kum-Mi Oh, Yong-Won Zeon
  • Publication number: 20090201503
    Abstract: A torsion sensor using an optical waveguide in optical communication with a diffraction grating, preferably a tilted grating, and most preferably a tilted Bragg grating, which provides the optical waveguide and grating with a torsion-dependent collective optical transmission spectrum. Changes in the collective optical transmission spectrum of the waveguide and grating, induced by changes in the amount of torsion applied to the waveguide, may be detected by detecting a corresponding change in the intensity of optical radiation transmitted through the grating from a controlled optical source. The degree of change in the collective optical transmission spectrum is dependent upon the degree of torsion (twist) applied to the optical waveguide. Measuring the magnitude and/or sense (i.e. increase/decrease) in the intensity of optical radiation transmitted through the grating from an optical source enables torsion to be sensed.
    Type: Application
    Filed: July 9, 2007
    Publication date: August 13, 2009
    Applicant: ASTON UNIVERSITY
    Inventors: Ian Bennion, Kaiming Zhou, Xianfeng Chen, Lin Zhang
  • Patent number: 7501627
    Abstract: The apparatus is a miniature assembly which detects very low power infrared radiation and produces an electronic signal. The incoming infrared is combined in a wavelength multiplexer with high energy light from a laser chip and passed through an upconversion crystal (a nonlinear optical crystal) in which their frequencies are added together. The higher frequency, lower wavelength, light is then directed to a miniature blue sensitive photomultiplier tube that generates an electrical signal. A thermoelectric cooler is used to control the temperature of the laser chip, and the entire device is assembled into a package which is approximately the size of a cigarette pack.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: March 10, 2009
    Assignee: Lepton Technologies, Inc.
    Inventor: Douglas A. Herr
  • Publication number: 20090009764
    Abstract: Test equipment determines the contents of medical fluids to be delivered to a patient by a medication delivery system by measuring optical properties of the fluids. One system provides a non-invasive test that uses optical rotation caused by optically active pharmaceutical substances to determine the presence or absence of the pharmaceutical substances within a medical fluid. Another system provides a non-invasive test that uses refractive index properties to determine the concentration of a pharmaceutical substance within the fluid. A method for use is also disclosed.
    Type: Application
    Filed: July 5, 2007
    Publication date: January 8, 2009
    Applicants: BAXTER INTERNATIONAL INC., BAXTER HEALTHCARE S.A.
    Inventor: James S. Slepicka
  • Publication number: 20080049224
    Abstract: The present invention aims to provide a polarization modulation imaging ellipsometer capable of measuring ellipsometric parameters of the surface of a sample for each of the measured points with high precision and at high speed.
    Type: Application
    Filed: April 16, 2007
    Publication date: February 28, 2008
    Applicant: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Soichi Otsuki, Mitsuru Ishikawa