Detector And Indicator Electrical Coupling (e.g., Amplifying Or Attenuating) Patents (Class 356/226)
  • Patent number: 10367333
    Abstract: An apparatus includes an optical amplifier waveguide and an optical reflector located to reflect back some light received at or near a first end of the optical amplifier waveguide. The apparatus also includes another optical waveguide having a first end located to receive light at or near a second end of the optical amplifier waveguide, and the another optical waveguide having a sequence of optical ring resonators optically connected there along with each of the optical ring resonators being configured to have a different free spectral range. A system and a method are also included.
    Type: Grant
    Filed: April 13, 2017
    Date of Patent: July 30, 2019
    Assignee: Nokia of America Corporation
    Inventors: Michael S. Eggleston, Guilhem de Valicourt
  • Patent number: 9461550
    Abstract: Method and apparatus for extending a zero voltage switching (ZVS) range during power conversion. In one embodiment, the apparatus comprises a DC/DC converter, operated in a quasi-resonant mode, comprising a transformer; a primary switch, coupled to a primary winding of the transformer, for controlling current flow through the primary winding; and a component coupled to the transformer, wherein the component has a capacitance that varies with voltage across the component, and wherein during a downswing in voltage across the primary switch the component is passively tuned by a change in the voltage across the component that changes the capacitance of the component, and wherein the passive tuning of the component causes a resonant frequency of the DC/DC converter to change, and wherein the change in the resonant frequency causes the downswing to accelerate.
    Type: Grant
    Filed: September 22, 2014
    Date of Patent: October 4, 2016
    Assignee: Enphase Energy, Inc.
    Inventor: Martin Fornage
  • Patent number: 8982341
    Abstract: A light distribution characteristic measurement apparatus includes: a detecting unit for detecting light from a light source; a mirror for reflecting the light from the light source to direct the light to the detecting unit; a movement mechanism for moving the detecting unit and the mirror relatively to the light source; a rotation mechanism for rotating the mirror while maintaining an optical path length from the light source to the detecting unit; and a processor adapted to calculate the light distribution characteristic of the light source, based on a plurality of measurement results that are detected by the detecting unit under a condition that the detecting unit and the mirror are arranged at a plurality of measurement positions relative to the light source and the mirror is oriented at different rotational angles for each measurement position.
    Type: Grant
    Filed: August 20, 2013
    Date of Patent: March 17, 2015
    Assignee: Otsuka Electronics Co., Ltd.
    Inventor: Yoshi Enami
  • Publication number: 20140268116
    Abstract: In various embodiments a device is provided. The device includes an integrated circuit that includes one or more photodetector elements and a blocking structure monolithically integrated with the one or more photodetector elements. The one or more photodetector elements are arranged relative to the blocking structure such that electrical currents provided by the one or more photodetector elements in response to electromagnetic waves received by the one or more photodetector elements are indicative of a direction to a source providing the electromagnetic waves.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Inventors: Andrea Fant, Rene Druml, Luca Sant
  • Patent number: 8823406
    Abstract: Systems and methods for simultaneous optical testing of a plurality of devices under test. These systems and methods may include the use of an optical probe assembly that includes a power supply structure that is configured to provide an electric current to a plurality of devices under test (DUTs) and an optical collection structure that is configured to simultaneously collect electromagnetic radiation that may be produced by the plurality of DUTs and to provide the collected electromagnetic radiation to one or more optical detection devices. The systems and methods also may include the use of the optical probe assembly in an optical probe system to evaluate one or more performance parameters of each of the plurality of DUTs.
    Type: Grant
    Filed: October 17, 2011
    Date of Patent: September 2, 2014
    Assignee: Cascade Micotech, Inc.
    Inventors: Bryan Bolt, Eric W. Strid, Kazuki Negishi, Steve Harris
  • Patent number: 8797522
    Abstract: To enable measurement over a wide dynamic range from weak light quantity to strong light quantity in a light quantity detection device for detecting the light quantity, a detection signal from a photon counting light detector is A/D converted. When the A/D converted detection signal has a preset threshold value or more, the detection signal is transmitted as it is to a number-of-photons calculation circuit in a subsequent stage, and when the detection signal has the threshold value or less, threshold value processing for transmitting a preset reference value to the subsequent stage is performed. In the number-of-photons calculation circuit, the number of photons or the light quantity incident on the photon counting light detector is acquired from the dimension of an acquired detection signal waveform until the light quantity measurement ends.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: August 5, 2014
    Assignee: Hitachi High-Technologies Corporation
    Inventors: Akihiro Namba, Fujio Onishi, Yasushi Terui
  • Publication number: 20140063493
    Abstract: An arrangement for monitoring a submarine reservoir comprises a number of sensor units located in an array (1) on the seabed, and an interrogator unit for obtaining data on the reservoir from the sensor units. The interrogator unit comprises a transmitter unit (20) for sending optical signals to the sensor array and a receiver unit for receiving modulated optical signals from the array. Optical radiation from an optical source (22) is transmitted along an uplink optical fibre which is split in a number of positions 36, 38 to form the array. The receiver unit comprises optical-to-electrical converters (54) for converting the optical signals to electrical signals, a phase demodulator (58), a multiplexer (60) for multiplexing signals from the phase demodulator, a signal processor (68) and recording unit (70).
    Type: Application
    Filed: March 12, 2012
    Publication date: March 6, 2014
    Applicant: TGS Geophysical Company (UK) Limited
    Inventors: Philip J. Nash, Edward Austin, Frank Eisenhower, Richard Luff
  • Patent number: 8520198
    Abstract: A goniophotometer includes an arc reflector; a holder for positioning a light source at the center of the arc reflector; a stationary detector substantially disposed at the center of the arc reflector and aimed at an arc reflective surface of the reflector; a driving device for rotating the holder with respect to the reflector and the detector about an axis of the light source; and a computing unit configured to convert a detection result of the detector into a measurement value.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: August 27, 2013
    Assignee: B&M Optics Co., Ltd.
    Inventor: Hung-Pin Kuo
  • Publication number: 20130114073
    Abstract: To enable measurement over a wide dynamic range from weak light quantity to strong light quantity in a light quantity detection device for detecting the light quantity, a detection signal from a photon counting light detector is A/D converted. When the A/D converted detection signal has a preset threshold value or more, the detection signal is transmitted as it is to a number-of-photons calculation circuit in a subsequent stage, and when the detection signal has the threshold value or less, threshold value processing for transmitting a preset reference value to the subsequent stage is performed. In the number-of-photons calculation circuit, the number of photons or the light quantity incident on the photon counting light detector is acquired from the dimension of an acquired detection signal waveform until the light quantity measurement ends.
    Type: Application
    Filed: July 1, 2011
    Publication date: May 9, 2013
    Applicant: Hitachi High-Technologies Corporation
    Inventors: Akihiro Namba, Fujio Onishi, Yasushi Terui
  • Patent number: 8274649
    Abstract: A method and apparatus for continuous monitoring of a light bulb or group of light bulbs. The light emission of a light bulb is compared with known emission failure values for similar types of light bulbs, and a determination of a near failure status for the bulb is made.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: September 25, 2012
    Assignee: International Business Machines Corporation
    Inventors: Rick A. Hamilton, II, Paul A. Moskowitz, Brian M. O'Connell, Clifford A. Pickover, Keith R. Walker
  • Patent number: 8253933
    Abstract: A sensor for sensing a target chemical with high signal-to-noise ratio is disclosed. In some embodiments, the sensor comprises a sensing region that is optically coupled with an attenuation region. The sensing region receives optical stimulation that comprises light characterized by an excitation wavelength. In response to exposure to the target chemical, the sensing region fluoresces at a fluorescence wavelength. The attenuation region receives light from the fluorescing sensing region that includes light characterized by the fluorescence wavelength (i.e., signal) and light characterized by the excitation wavelength (i.e., noise). The attenuation region conveys the light to a detector that provides an electrical output signal based on the target chemical. While conveying the light, however, the attenuation region improves the signal-to-noise ratio by attenuating light characterized by the excitation wavelength more than light characterized by the fluorescence region.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: August 28, 2012
    Assignee: Octrolix B.V.
    Inventor: Rene Gerrit Heideman
  • Patent number: 8154716
    Abstract: A sensor for sensing a target chemical with high signal-to-noise ratio is disclosed. In some embodiments, the sensor comprises a sensing region that is optically coupled with an attenuation region. The sensing region receives optical stimulation that comprises light characterized by an excitation wavelength. In response to exposure to the target chemical, the sensing region fluoresces at a fluorescence wavelength. The attenuation region receives light from the fluorescing sensing region that includes light characterized by the fluorescence wavelength (i.e., signal) and light characterized by the excitation wavelength (i.e., noise). The attenuation region conveys the light to a detector that provides an electrical output signal based on the target chemical. While conveying the light, however, the attenuation region improves the signal-to-noise ratio by attenuating light characterized by the excitation wavelength more than light characterized by the fluorescence region.
    Type: Grant
    Filed: September 4, 2009
    Date of Patent: April 10, 2012
    Assignee: Octrolix BV
    Inventor: Rene Gerrit Heideman
  • Publication number: 20120057152
    Abstract: A high speed analog photon counter and method is provided. In one aspect, the method includes delivering an electric charge to a circuit of the high speed analog photon counter through a current source of the circuit. The method also includes accumulating the electric charge in a capacitor of the circuit electrically coupled to the current source. The method further includes comparing the electric charge accumulated in the capacitor of the circuit with a reference voltage through a comparator of the circuit electrically coupled to an output of the capacitor. The output of the capacitor of the circuit is coupled to an input of the comparator of the circuit, and the reference voltage is coupled to another input of the comparator of the circuit. The method furthermore includes resetting the capacitor of the circuit when the electric charge accumulated in the capacitor of the circuit matches the reference voltage.
    Type: Application
    Filed: September 6, 2010
    Publication date: March 8, 2012
    Applicant: King Abdulaziz City Science and Technology
    Inventors: MUNIR ELDESOUKI, Mohamed Jamal Deen, Qiyin Fang
  • Patent number: 8004665
    Abstract: Disclosed is a system to measure the energy level of a radiation pulse. The system includes a sample-and-hold module to measure the radiation pulse and to generate a signal representative of an energy level of the radiation pulse, and a processing module to determine an energy value of the radiation pulse based on the signal generated by the sample-and-hold module.
    Type: Grant
    Filed: June 2, 2008
    Date of Patent: August 23, 2011
    Assignee: Lumenis, Ltd.
    Inventor: Dirk D. Cooley
  • Patent number: 7973917
    Abstract: The present invention relates to the technical field of measuring light source, specifically, to the method for measuring the luminous flux of LED. In the present invention, a reflecting cup is used as a collector of the luminous flux of LED. The collector has two sectional openings in the direction perpendicular to the symmetric axis thereof, which are positioned in the front and in the rear respectively, one of them positioned at the bottom end of the collector and having a smaller radius is used to input the light emitted by LED to be measured, the other positioned in the front end of the collector and having a larger radius is used to output the light to the detector placed in this position. Specifically, LED is fixed at the bottom end of the collector with a fixture, the light emitted by LED is directed toward the large opening of the collector, and the photometer is fixed closely at the large opening of the collector to receive light signals.
    Type: Grant
    Filed: August 13, 2008
    Date of Patent: July 5, 2011
    Assignee: Fudan University
    Inventors: Muqing Liu, Xiaoli Zhou, Hai Ping Shen
  • Publication number: 20110058158
    Abstract: A sensor for sensing a target chemical with high signal-to-noise ratio is disclosed. In some embodiments, the sensor comprises a sensing region that is optically coupled with an attenuation region. The sensing region receives optical stimulation that comprises light characterized by an excitation wavelength. In response to exposure to the target chemical, the sensing region fluoresces at a fluorescence wavelength. The attenuation region receives light from the fluorescing sensing region that includes light characterized by the fluorescence wavelength (i.e., signal) and light characterized by the excitation wavelength (i.e., noise). The attenuation region conveys the light to a detector that provides an electrical output signal based on the target chemical. While conveying the light, however, the attenuation region improves the signal-to-noise ratio by attenuating light characterized by the excitation wavelength more than light characterized by the fluorescence region.
    Type: Application
    Filed: September 4, 2009
    Publication date: March 10, 2011
    Applicant: OCTROLIX BV
    Inventor: Rene Gerrit Heideman
  • Patent number: 7859676
    Abstract: Plasmon energy is produced by exciting a plasmon resonance at least one excitation position on a first surface of a first material, and the plasmon energy is detected at at least one measurement position on the first surface after the plasmon energy has propagated from the at least one excitation position to the at least one measurement position. An attenuation of plasmon energy is determined along a plurality of paths between the at least one excitation position and the at least one measurement position, and relative distances between the first surface and a second surface of a second material are determined at a plurality of points on at least one of the surfaces based on the determined attenuation of plasmon energy along the plurality of paths.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: December 28, 2010
    Assignee: The Invention Science Fund I, LLC
    Inventor: Roderick A. Hyde
  • Publication number: 20100186817
    Abstract: A light intensity display apparatus includes a light guide module, a photosensing module, a processing module, a display module and a box for containing various components. The light guide module is provided for receiving a light source and transmitting the light source to a photosensing module. The light signal is converted into an electric signal, and the processing module receives the electric signal, determines a light intensity according to the electric signal, and transmits the light intensity to the display module for displaying the light intensity.
    Type: Application
    Filed: July 16, 2008
    Publication date: July 29, 2010
    Inventors: Shih-Hui CHEN, Chin-Tien Lin
  • Publication number: 20090316147
    Abstract: A method and apparatus for continuous monitoring of a light bulb or group of light bulbs. The light emission of a light bulb is compared with known emission failure values for similar types of light bulbs, and a determination of a near failure status for the bulb is made.
    Type: Application
    Filed: March 6, 2009
    Publication date: December 24, 2009
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Rick A. Hamilton, II, Paul Moskowitz, Brian M. O'Connell, Clifford A. Pickover, Keith R. Walker
  • Patent number: 7619727
    Abstract: The present invention relates to a light wavelength and intensity measuring device. The device automatically measures a center wavelength of the light source and an intensity of the light corresponding to the center wavelength by using a main photodetector, at least one optical filter, and at least one sub photodetector when the light source is connected to the device. The main photodetector detects the intensity of the light applied by the light source, the optical filter transmits the light corresponding to a prediscriminated transmission wavelength, and the sub photodetector detects the intensity of the light transmitted through the optical filter. Therefore, the light intensity is more accurately measured by calibrating the intensity according to the wavelength.
    Type: Grant
    Filed: June 7, 2006
    Date of Patent: November 17, 2009
    Assignee: Raybit Systems Inc.
    Inventors: Gap Youl Lyu, Kilhun Koo, Min Hee Kang, Ba Cao
  • Patent number: 7525648
    Abstract: A device for examining the optical properties of surfaces includes a first radiation source which emits radiation to an examination surface, at least one first detector device, for detecting the radiation reflected off the surface and emitting at least one signal that is characteristic of at least one parameter of the detected radiation, wherein the detector device includes a plurality of image capturing components arranged in a specified detection area and wherein a control is provided for compensating signal changes caused by a shift of the location where the reflected radiation is incident on the detection area.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: April 28, 2009
    Assignee: BYK Gardner GmbH
    Inventors: Uwe Sperling, Konrad Lex
  • Patent number: 7518715
    Abstract: A method for receiving light from a plurality of light sources using an apparatus configured to analyze the time dependence of the light intensity to determine a type of light bulb and light intensity from the plurality of light sources based upon a detected frequency of variation of the light intensity.
    Type: Grant
    Filed: June 24, 2008
    Date of Patent: April 14, 2009
    Assignee: International Business Machines Corporation
    Inventors: Rick A. Hamilton, II, Paul A. Moskowitz, Brian M. O'Connell, Clifford A. Pickover, Keith R. Walker
  • Publication number: 20090066938
    Abstract: The present invention relates to the technical field of measuring light source, specifically, to the method for measuring the luminous flux of LED. In the present invention, a reflecting cup is used as a collector of the luminous flux of LED. The collector has two sectional openings in the direction perpendicular to the symmetric axis thereof, which are positioned in the front and in the rear respectively, one of them positioned at the bottom end of the collector and having a smaller radius is used to input the light emitted by LED to be measured, the other positioned in the front end of the collector and having a larger radius is used to output the light to the detector placed in this position. Specifically, LED is fixed at the bottom end of the collector with a fixture, the light emitted by LED is directed toward the large opening of the collector, and the photometer is fixed closely at the large opening of the collector to receive light signals.
    Type: Application
    Filed: August 13, 2008
    Publication date: March 12, 2009
    Applicant: FU DAN UNIVERSITY
    Inventors: Muqing Liu, Xiaoli Zhou, Haiping Shen
  • Publication number: 20090066936
    Abstract: A microfluidic device comprises inlets for a sample flow and an out-of-plane focusing sheath flow, and a curved channel section configured to receive the sample flow and out-of-plane focusing sheath and to provide hydrodynamic focusing of the sample flow in an out-of-plane direction, the out-of-plane direction being normal to a plane including the curved channel.
    Type: Application
    Filed: September 10, 2008
    Publication date: March 12, 2009
    Applicant: The Penn State Research Foundation
    Inventors: Tony Jun Huang, Xiaole Mao
  • Patent number: 7501617
    Abstract: A tester according to the present invention can conduct a test on optical devices each having a different positional relation between a position of a contact face of an external contact terminal and a direction of light emitted from a semiconductor laser element.
    Type: Grant
    Filed: March 14, 2006
    Date of Patent: March 10, 2009
    Assignee: Panasonic Corporation
    Inventors: Isao Hayami, Toru Nishikawa, Masaya Tateyanagi, Syouichi Tanaka
  • Patent number: 7440088
    Abstract: Methods and devices are provided for profiling a beam of light that includes a wavelength ?. The beam of light is received. Secondary light is generated at a wavelength ?? different from wavelength ? by fluorescing a material with the received beam of light. The secondary light is separated from the received beam of light. The separated secondary light is optically directed to a sensor.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: October 21, 2008
    Assignee: Applied Materials, Inc.
    Inventors: Timothy N. Thomas, Bruce Adams, Dean C. Jennings
  • Patent number: 7428051
    Abstract: The invention relates to a device for the IR-spectrometric analysis of a solid, liquid or gaseous medium. The device includes a process probe, which has a reflection element. The device additionally includes a linear variable filter, at least one detector element, and a control/evaluation unit. At least one light source is also provided, the light of which is coupled into the reflection element via a collimating optics. At least one optical waveguide having a light input section and a light output section is provided. The light is guided via the light output section of the optical waveguide into a defined region of the linear variable filter. The detector element and the linear variable filter are arranged movably relative to one another over approximately the length of the linear variable filter. The control/evaluation unit determines the spectrum of the medium on the basis of the measured values delivered from the detector element.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: September 23, 2008
    Assignee: Endress + Hauser Conducta Gesellschaft fur Mess-u. Regeltechnik mgH + Co. KG
    Inventors: Camiel Heffels, Dirk Steinmueller, Dick Scholten, Peter Lindmueller
  • Publication number: 20080225278
    Abstract: A focal position determining method determines a focal position of an objective lens focused on an observed target region in a specimen. The focal position determining method includes measuring any one of the focal position of the objective lens at a near point and the focal position of the objective lens at a far point or both so as to determine the focal position of the objective lens focused on the observed target region based on the measured focal position.
    Type: Application
    Filed: March 28, 2008
    Publication date: September 18, 2008
    Applicant: OLYMPUS CORPORATION
    Inventors: Akihiro NAMBA, Hirobumi SUZUKI, Hiroshi ISHIWATA
  • Patent number: 7371538
    Abstract: An integrated microluminometer includes an integrated circuit chip having at least one n-well/p-substrate junction photodetector for converting light received into a photocurrent, and a detector on the chip for processing the photocurrent. A distributed electrode configuration including a plurality of spaced apart electrodes disposed on an active region of the photodetector is preferably used to raise efficiency.
    Type: Grant
    Filed: June 14, 2005
    Date of Patent: May 13, 2008
    Assignee: UT-Battelle, LLC
    Inventors: Michael L. Simpson, Michael J. Paulus, Gary S. Sayler, Bruce M. Applegate, Steven A. Ripp
  • Patent number: 7365833
    Abstract: Two or more triangular apertures are employed to pass radiation from a source to a detector to reduce the amount of stray radiation received by the detector. Preferably, the two apertures are equilateral triangles oriented at 60 rotated relative to each other and have dimensions proportional to their distances from the detector. A Bessel filter is employed to reduce the effect of flicker and other rapid changes in intensity in the radiance from the source. The output of the sensor is integrated and sampled at sampling time intervals that are powers of two of time, and a reading is provided when the output of the integrator exceeds the same threshold under all radiation source intensity conditions so that the meter has a substantially constant resolution at different signal levels. Where the radiation from the source is transmitted or reflected by the sample before such radiation is detected by the detector, the instrument becomes a transmissometer or reflectometer.
    Type: Grant
    Filed: February 5, 2004
    Date of Patent: April 29, 2008
    Assignee: Delta E
    Inventor: Edward Granger
  • Patent number: 7217371
    Abstract: The present invention relates to interfacing new sensors to incumbent controls. In particular, it relates to optically interfacing a new sensor, such as a spectrometer with plasma generator, to an incumbent electro-optical sensor. Logic and resources to control activation of the incumbent electro-optical sensor may be included. Particular aspects of the present invention are described in the claims, specification and drawings.
    Type: Grant
    Filed: July 26, 2004
    Date of Patent: May 15, 2007
    Assignee: Lightwind Corporation
    Inventor: Herbert E. Litvak
  • Patent number: 7068362
    Abstract: The present invention provides apparatus for a beam transmissometer. In an embodiment, the beam transmissometer includes a LED signal source, collimating apparatus, a retroreflector that directs the projected beam, imaging apparatus that directs the beam onto a detector that converts the projected beam into an electrical signal, and signal processing circuitry that enhances the reception of the optical beam. The LED signal source is modulated in a pulsed fashion so that the effects of beam reflection are ameliorated. Signal processing circuitry amplifies, filters, and synchronizes to the electrical signal. A calculating unit uses the processed signal to determine a beam attenuation coefficient, which is indicative of the visibility of a medium in which the transmissometer is immersed. A method is also provided for aligning optics of a beam transmissometer. The method determines an offset and a rotation of a retroreflector housing that causes an optical beam to be centered.
    Type: Grant
    Filed: January 22, 2003
    Date of Patent: June 27, 2006
    Assignee: The Johns Hopkins University
    Inventors: Thomas M. Murdock, Kirk S. Decker, James T. Velky, Karen D. Rennich
  • Patent number: 7062168
    Abstract: Multiple stage ranging circuitry for a measuring circuit includes a first ranging circuit that selectively amplifies an input signal by respective amounts according to the magnitude of the input signal thereto, and a second ranging circuit coupled to the output of the first ranging circuit selectively amplifies the output signal from the first ranging circuit by a respective amount according to the magnitude of that output signal to provide a measured output. The multiple stage ranging circuitry increases dynamic range and provides for high speed measurements over that dynamic range.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: June 13, 2006
    Assignee: DBM Optics, Incorporated
    Inventors: Michael Paul Atwell, Michael Paul Minneman, Elwood James Egerton
  • Patent number: 6788398
    Abstract: A method and apparatus for rapid measurements of far-field radiation profiles having a large dynamic range from an optical source is disclosed. Some embodiments of the apparatus include a collector coupled to a rotating hub so that the rotation of an entrance to the collector defines a plane, a detector coupled to receive light captured at the entrance to the collector, and detector electronics having a programmable gain coupled to receive a signal from the detector, Some embodiments may include a rotatable entrance mirror for reflecting light from the optical source into the plane of the entrance of the collector. In some embodiments, the optical source is fixed relative to the plane of the entrance of the collector. In some embodiments, the optical source is rotatable in the plane defined by the entrance of the collector. In some embodiments, the source can be an optical fiber. In some embodiments, the source can be a material irradiated by a laser.
    Type: Grant
    Filed: October 27, 2000
    Date of Patent: September 7, 2004
    Assignee: Photon, Inc.
    Inventor: Jeffrey L. Guttman
  • Patent number: 6784987
    Abstract: A range selection circuit (13), including a logarithmic amplifier (23) and output circuitry (25) associated therewith, is configured to directly drive linear ranging circuitry for measurement circuitry (12) in an optical power meter (10) to measure signals that vary over a wide range of, for example, from about −7 dB to about −45 dB. This allows the optical power meter to change ranges as fast as one (1) times the hardware settling time. The range selection circuitry is in parallel with the measurement circuitry, which allows ranging to happen in real time.
    Type: Grant
    Filed: January 21, 2002
    Date of Patent: August 31, 2004
    Assignee: DBM Optics, Incorporated
    Inventors: Michael Paul Minneman, Michael Paul Atwell, Elwood James Egerton
  • Publication number: 20040136002
    Abstract: The present invention provides an improved system for measuring the appearance of an object, that improves upon the prior art systems by employing a digital CMOS camera and a variety of features attendant thereto, provides an improved calibration system, an improved quality control system, an improved tooth whitening system, and an improved crown design system.
    Type: Application
    Filed: October 10, 2003
    Publication date: July 15, 2004
    Inventors: Peter Whaite, Pierre-Jules Tremblay
  • Patent number: 6760099
    Abstract: A sun meter having a processor receiving a signal from a photocell. The processor first compares the signal to a first threshold to determine if it is daytime. If it is daytime, the processor then compares the signal to a second threshold to determine if the signal is greater than a value selected to correspond with direct sunlight. If the signal is greater than the second threshold, a counter counts. For each day of use, the amount of time of direct sun is tallied and may be displayed. An average amount of direct sun for a period of days may also be displayed. It is anticipated that a plurality of meters will be utilized in a specific area to determine the specific locations which receive the most direct sunlight and then know what plants will thrive and where to place such plants.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: July 6, 2004
    Inventors: Joseph D. Lewis, William Street, Al Alfers
  • Patent number: 6734957
    Abstract: An apparatus for collecting and sensing light in a projector, comprising a cold mirror positioned directly in the incident light path from a lamp and illumination optics of the projector for reflecting a large portion of visible light towards a light imaging device while transmitting IR and UV light and a small portion of the visible light; a secondary mirror for reflecting the small portion of the visible light, an integrating box positioned to collect and integrate the small portion of visible light, a light tube in optical communication with the integrating box for further integrating and attenuating the small portion of visible light, and an electro-optic device within the light tube for measuring the small portion of visible light within the light tube and generating an electrical signal in response thereto.
    Type: Grant
    Filed: January 31, 2002
    Date of Patent: May 11, 2004
    Assignee: Christie Digital Systems, Inc.
    Inventors: Terry Schmidt, John Parkin
  • Patent number: 6642501
    Abstract: The signal current corresponding to an incident light intensity is output from a photodiode, and the integrating circuit stores an electric charge according to the signal current and outputs a signal voltage corresponding to the amount of the stored electric charge. The first CDS circuit stores in the integrating capacitor an electric charge corresponding to a change in the signal voltage output from the integrating circuit. Similarly, the second circuit stores in the integrating capacitor an electric charge corresponding to a change in the signal voltage output from the integrating circuit. The difference calculation circuit determines a difference between the amount of charge stored in the integrating capacitor of the first CDS circuit and the amount of charge stored in the integrating capacitor of the second CDS circuit, and outputs a signal voltage corresponding to the difference.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: November 4, 2003
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Seiichiro Mizuno, Haruhiro Funakoshi
  • Patent number: 6556289
    Abstract: Two or more triangular apertures are employed to pass radiation from a source to a detector to reduce the amount of stray radiation received by the detector. Preferably, the two apertures are equilateral triangles oriented at 60° rotated relative to each other and have dimensions proportional to their distances from the sensor. A Bessel filter is employed to reduce the effect of flicker and other rapid changes in intensity in the radiance from the source. The output of the sensor is integrated and sampled at sampling time intervals that are powers of two of time, and a reading is provided when the output of the integrator exceeds the same threshold under all radiation source intensity conditions so that the meter has a substantially constant resolution at different signal levels.
    Type: Grant
    Filed: June 28, 2000
    Date of Patent: April 29, 2003
    Assignee: Roygbiv, LLC
    Inventor: Edward Granger
  • Patent number: 6522401
    Abstract: A light-measuring device comprises a photosensor, a light shield and a control device. The light shield has a plurality of apertures. Light from a luminous surface of a plane light source project onto the photosensor through the apertures of the light shield to form a plurality of non-overlapping photosensing areas on the photosensor. Each photosensing area on the photosensor generates a corresponding signal. The control device analyzes the corresponding signals from the photosensing areas to check the light from each corresponding test area on the luminous surface. With the light-measuring device, a tester can adjust the color temperature and brightness values of the plane light source.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: February 18, 2003
    Assignee: Benq Corporation
    Inventor: Jih-Yung Lu
  • Patent number: 6466313
    Abstract: A method for determining the time curve of the intensity of radiation present at the location of at least one sample which is being examined. The sample follows a circular path of movement in a sealed sample chamber of a weathering testing device, around a stationary radiation device for producing UW and global radiation. At least one sensor which detects the momentary radiation intensity of the radiation device is provided. The sensor moves together with the at least one sample, and is displaced in relation thereto in relation to the radiation device, for example in the peripheral direction of the path of movement. An electrical signal corresponding to the momentary intensity of the radiation is derived by the sensor at set intervals.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: October 15, 2002
    Assignee: Atlas Material Testing Technology GmbH
    Inventors: Christian Bernatek, Bernd Rudolph
  • Patent number: 6462819
    Abstract: In a light measuring apparatus, pulse-like measuring light is received by n photoelectric converting means and electric signals responsive to received light intensities are outputted therefrom. Time constant converting circuits elongate each of the electric signals in the direction of a time axis and outputs elongated electric signals. The respective levels of the elongated electric signals are detected at times different in width in the direction of the time axis. At this time, the timings with which the levels of n elongated electric signals are detected are shifted from each other. By using the result of detection, the respective integral values of the n elongated electric signals can be calculated without using integrating circuits. This reduces the number of components and the size and cost of a device.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: October 8, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Koichi Terauchi, Eiji Kitagawa
  • Patent number: 6320179
    Abstract: A system and method for determining noise power levels across a range of frequencies of the optical signal output from a device operating at a specified optical power and drive current and, in particular, for determining relative intensity noise values (RIN). The system may comprise a reference laser for generating an optical reference signal and a photodetector for converting the optical signal output from the reference laser and the device under test into equivalent electrical signals. The system also comprises means for measuring ac and dc components of the electrical signals output from the photodetector. The system may be used to measure RIN levels to an accuracy of less than 1 dB. Such measurements are of particular importance in the field of fiber optic telecommunications. The reference laser is shot noise limited in the frequency range of interest, typically between 20 MHz and 20 GHz, and has a narrow linewidth, typically less than 5 kHz.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: November 20, 2001
    Assignee: The Secretary of State for Defence in Her Britanic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland
    Inventors: Michael Cox, Nigel Copner
  • Publication number: 20010038453
    Abstract: Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention.
    Type: Application
    Filed: June 1, 2001
    Publication date: November 8, 2001
    Inventors: Wayne D. Jung, Russell W. Jung, Alan R. Loudermilk
  • Patent number: 6268918
    Abstract: An apparatus and method for detecting a three-dimensional image. The apparatus includes a projector which projects a reference light on an object; an image sensor which senses an image of the object; and a controller for controlling the projector and the image sensor, wherein the image sensor includes an aperture that restricts the passage of entering light; and an aperture controller for setting an aperture value for the aperture when receiving a two-dimensional image input, and setting an aperture value for the aperture when receiving a three-dimensional image input. The aperture value is set based on the intensity of received reference light. A processing unit determines the position of the object based on a relationship between an illumination direction of the reference light at the determined time center Npeak and an entrance direction of the reference light relative to the target pixel.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: July 31, 2001
    Assignee: Minolta Co., Ltd.
    Inventors: Hideki Tanabe, Eiichi Ide, Hiroshi Uchino, Makoto Miyazaki, Koichi Kamon, Toshio Norita
  • Patent number: 5991014
    Abstract: A light sensing device for sensing the light output of a bulb in a lamp comprises a fiber-optic light guide having first and second ends and a photodetector. The first end is optically coupled to a projection of a bulb in the lamp and is adapted to pick up light transmitted through the projection from within the bulb. The second is optically coupled to the photodetector such that light exiting from the second end impinges on the photodetector to generate an output indicative of the light output of the bulb.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: November 23, 1999
    Assignee: Fusion UV Systems, Inc.
    Inventor: Jerome D. Frank
  • Patent number: 5880827
    Abstract: A measurement circuit having high dynamic range includes high-gain and low-gain amplifiers connected in parallel. A shunt feedback circuit is activated to prevent the high-gain amplifier from saturating when the magnitude of an input signal exceeds its dynamic range. The output of the high-gain amplifier is utilized to measure small input signals and the output of the low-gain amplifier is utilized to measure large input signals.
    Type: Grant
    Filed: November 11, 1997
    Date of Patent: March 9, 1999
    Assignee: Raytek Subsidiary, Inc.,
    Inventor: Thomas Heinke
  • Patent number: 5808733
    Abstract: In a device for measuring feeble light and a method thereof, the device includes a feeble light amplifying device having a reaction chamber with two transparent windows as a constituent part, a detector, and two mirrors. The feeble light generated in the reaction chamber in which an etching process is in progress is amplified by the mirrors and is then detected, whereby an etching endpoint can be accurately determined. Therefore, the damage to semiconductors due to overetching or underetching can be prevented.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: September 15, 1998
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Kyeong-koo Chi
  • Patent number: 5789738
    Abstract: A circuit is provided for adjusting an operating point of an opto-electronic element having a saturation voltage and which constitutes a component of a receiver for alternating light useful signals and which generates current during a short-circuit operation and voltage during a no-load operation. The circuit comprises a resistive circuit connected in parallel with the opto-electronic element for adjusting the operating point of the opto-electronic element below the saturation voltage for the compensation of constant light signals. The resistive circuit includes an automatic control resistor which changes its resistance as a function of voltage when a specific voltage below the saturation voltage is exceeded for loading the opto-electronic element until the specific voltage is essentially reached.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: August 4, 1998
    Inventor: Gerd Reime