Patents Examined by Darren M. Jiron
  • Patent number: 6396060
    Abstract: A system for sensitively discriminating against background radiation which tends to swamp and prevent detection of radiation from a source of interest such as IR (Infra-Red) light radiation as may be found on “low observable” aircraft collision avoidance lighting, utilizes the modulation of such radiation as a mechanism for tracking the radiation and discriminating against the background radiation, for example, from other light energy sources.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: May 28, 2002
    Inventor: John G. Ramsey
  • Patent number: 6046454
    Abstract: A radiation detector for detecting ionizing radiation. The detector includes a semiconductor having at least two sides. A bias electrode is formed on one side of the semiconductor. A signal electrode is formed on a side of the semiconductor and is used to detect the energy level of the ionizing radiation. A third electrode (the control electrode) is also formed on the semiconductor. The control electrode shares charges induced by the ionizing radiation with the signal electrode, shielding the signal electrode until the charge clouds are close to the signal electrode. The control electrode also alters the electric field within the semiconductor, such that the field guides the charge clouds toward the signal electrode when the clouds closely approach the signal electrode. As a result, signal loss due to trapped charge carriers (i.e., electrons or holes) is minimized, and low-energy tailing is virtually eliminated.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: April 4, 2000
    Assignee: Digirad Corporation
    Inventors: Clinton L. Lingren, Jack F. Butler, Boris Apotovsky, Richard L. Conwell, F. Patrick Doty, Stanley J. Friesenhahn
  • Patent number: 6015974
    Abstract: A scintillation camera including photosensors for producing an output in response to emitted light; a scintillation material for emitting light directed to the photosensors in response to radiation absorbed by a source, the scintillation material formed in two or more segments defining an optical interface between adjacent segments; and an increased surface area at the interface for improving the transmissivity of the interface and efficiently optically coupling the adjacent sensors.
    Type: Grant
    Filed: July 21, 1997
    Date of Patent: January 18, 2000
    Assignee: Digital Scintigraphics, Inc.
    Inventor: Sebastian Genna
  • Patent number: 5994713
    Abstract: Filmless photon imaging sensor plates and apparatus which are particularly effective in medical radiology and industrial applications including, but not limited to high resolution mammography. In combination, the sensor plates and apparatus provide rapid production of high resolution images which exhibit higher sensitivity and wider dynamic range than contemporary X-ray systems. Novel sensor plate structures provide images having attributes of increased sensitivity; dual plate design providing increased pixel read-out speed and differential dual energy image production; and electrically isolated segments by which a plurality of pixels are read concurrently to reduce overall image processing time. Generally, the plates employ a homogeneous photoconductive material such as amorphous selenium and are read by exposing each pixel sized area to a small diameter scanning light beam. Using light beam scanning, resulting plate design promises low cost manufacture of both sensor plates and associated apparatus.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: November 30, 1999
    Assignee: Quantum Imaging Corp.
    Inventors: Charles D. Becker, Harry Dell Foster, Alfonzo Zermeno, Gale H. Thorne, James V. Yardley
  • Patent number: 5981956
    Abstract: Labeled targets on a support synthesized with polymer sequences at known locations according to the methods disclosed in U.S. Pat. No. 5,143,854 and PCT WO 92/10092 or others, can be detected by exposing marked regions of sample to radiation from a source and detecting the emission therefrom, and repeating the steps of exposition and detection until the sample is completely examined.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: November 9, 1999
    Assignee: Affymetrix, Inc.
    Inventor: David Stern
  • Patent number: 5977544
    Abstract: Systems and methods for infrared detection are described. An optomechanical photon detector includes a semiconductor material and is based on measurement of a photoinduced lattice strain. A multicolor infrared sensor includes a stack of frequency specific optomechanical detectors. The stack can include one, or more, of the optomechanical photon detectors that function based on the measurement of photoinduced lattice strain. The systems and methods provide advantages in that rapid, sensitive multicolor infrared imaging can be performed without the need for a cooling subsystem.
    Type: Grant
    Filed: July 28, 1997
    Date of Patent: November 2, 1999
    Assignee: Lockheed Martin Energy Research Corporation
    Inventors: Panagiotis G. Datskos, Solobodan Rajic, Irene C. Datskou
  • Patent number: 5973330
    Abstract: A fluorescence detection apparatus is provided which has a partial reflection mirror 8 for transmitting a part of fluorescence light emitted from a fluorescent substance by projecting excitation light and reflecting the rest of the fluorescence light, and a pair of a first and a second photodiode 2,3 for measuring the light transmitted through or reflected by partial reflection mirror 8 respectively at a selected wavelength, and the pair of the first and the second diodes are arranged to be optically equivalent relative to the partial reflection mirror 8. This fluorescence detection apparatus is affected less by positional deviation of the measurement cell relative to the optical measurement system.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: October 26, 1999
    Assignee: Tosoh Corporation
    Inventor: Hidechika Hayashi
  • Patent number: 5965890
    Abstract: A chopper is provided of solid state construction. Two layers are provided adjacent one another with the area between the layers defining one or more diffusion zones. One or more voltage potentials may be applied across the second layer to correspond to the diffusion zones. At an initial state the voltage potentials are either zero or some predetermined value which causes the index of refraction of the two layers to be substantially the same. At a second state the voltage potential equals some predetermined value to cause the index of refraction of the second layer to be different from that of the first layer. The difference in index of refraction between the layers creates a diffraction grating in the respective diffusion zone to diffuse that portion of an incident signal passing through the diffusion zone.
    Type: Grant
    Filed: December 30, 1997
    Date of Patent: October 12, 1999
    Assignee: Raytheon Company
    Inventor: Charles M. Hanson
  • Patent number: 5955734
    Abstract: A high temperature photocurrent detector circuit including a transimpedance amplifier having multiple stages of gain, and a driver amplifier which generates a driver current that is proportional to the photocurrent flowing through a photocurrent sensor. The voltage source utilizes source voltage wires to generate a supply current that is proportional to the driver current enabling the photocurrent detector circuit to operate as a two wire photocurrent detector circuit.
    Type: Grant
    Filed: September 19, 1997
    Date of Patent: September 21, 1999
    Assignee: General Electric Company
    Inventors: Gerald John Michon, Louis Jacob Petrucco, Dale Marius Brown
  • Patent number: 5952655
    Abstract: A method and apparatus are provided to concentrate and detect very low levels of radioactive noble gases from the atmosphere. More specifically the invention provides a method and apparatus to concentrate xenon, krypton and radon in an organic fluid and to detect these gases by the radioactive emissions.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: September 14, 1999
    Assignees: The United States of America as represented by the United States Department of Energy, University of Cincinnati
    Inventors: Kenneth C. Gross, John D. Valentine, Francis Markum, Mary Zawadzki, Charles Dickerman
  • Patent number: 5952661
    Abstract: Thermal imaging chopper (20) may comprise a disk (40) formed of a thermally transmitting material. The disk (40) may include a structure (44) operable to randomly scatter thermal radiation of the scene (14).
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: September 14, 1999
    Assignee: Raytheon Company
    Inventor: Paul Klocek
  • Patent number: 5949073
    Abstract: A photo semiconductor element is covered by a cap with an incident window permitting incident light to penetrate through a translucent member. The photo semiconductor element detects a quantity of incident light penetrating through the translucent member of the incident window. The translucent member of the incident window is made of a material capable of suppressing the transmitting light quantity of incident light components having wavelengths less than 700 nm and larger than 900 nm. A photoelectric current output of the photo semiconductor element is controlled by the incident light penetrating through the translucent member of the incident window. The photo semiconductor element operates in multiple ways as a thermosensing sensor and a photosensing sensor.
    Type: Grant
    Filed: April 7, 1997
    Date of Patent: September 7, 1999
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Masaki Shimoyama
  • Patent number: 5942759
    Abstract: A counterfeit detection viewer apparatus for detecting security markings in paper currency. The counterfeit detection viewer apparatus includes a viewer housing having a detection opening on the bottom thereof for receiving the paper currency to be inspected and a viewing opening on the top thereof for inspecting the paper currency. The counterfeit detection viewer apparatus further includes a pair of holding brackets for detachably holding the counterfeit detector unit within the viewer housing which is usable within the housing and is removable for use as a hand-held counterfeit detector unit in a dark room or dark area. The counterfeit detector unit includes a UV light fixture mounted in the counterfeit detector unit having a UV fluorescent lamp for projecting UV light rays toward the detection opening and the paper currency to be inspected. The UV fluorescent lamp being less than 0.5 cm from the detection opening.
    Type: Grant
    Filed: December 29, 1997
    Date of Patent: August 24, 1999
    Inventor: Camille Romano
  • Patent number: 5936250
    Abstract: Apparatus for the optical detection of selected toxic gases, using the ultraviolet region of the electromagnetic spectrum, and the known absorption properties of the toxic gases in the ultraviolet region. An ultraviolet flashlamp source illuminates a straight, highly polished metal tube with numerous perforations to permit access for the gas to be detected. The ultraviolet light then enters an optical compartment comprising an optical beamsplitter and two ultraviolet detectors with wavelength selective narrowband filters attached. The filters are selected so that one overlaps the region of absorption by the gas while the second is in a region where there is no absorption by the gas. The electronic circuit following the ultraviolet detectors and the drivers for the flashlamp, are timed by a microprocessor that provides the means for the electronics and data processing to be synchronized with the flashlamp pulse.
    Type: Grant
    Filed: July 24, 1997
    Date of Patent: August 10, 1999
    Assignee: General Monitors, Incorporated
    Inventors: Shankar Baliga, Herbert H. Rabe
  • Patent number: 5936245
    Abstract: The invention is a method and system for detecting, by means of specific processings of images of an area flown over taken in several spectral bands, signs indicative of a stress of the vegetation and the presence of spots where fire is likely to occur or spread. Images of the area flown over are acquired by means of a photography device (1) in a first spectral band selected in the red part (R) of the visible spectrum, in a second spectral band of the near infrared spectrum (N.I.R.) and in a third spectral band in the thermal infrared spectrum selected to locate parts of the area showing both a hydric stress and hot spots. Coded composite images are obtained by color coding of the aforementioned spectral bands and the images obtained in the three spectral bands are combined by means of a processing system (12, 13), which identifies fire development hazards caused by water deficit and local overheating. The system can be used for fire forecast, protection and fighting.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: August 10, 1999
    Assignee: Institut Francais du Petrole
    Inventors: Charles Goillot, Alain Wadsworth, Andre Sander, Andre Renot
  • Patent number: 5936246
    Abstract: A plate for positioning a radiation test wipe in alignment with a sensor on a radiation monitoring instrument includes a recessed mounting area on the plate that conforms to the geometry of the wipe. Guide members on the plate slidably engage brackets attached to a back panel of the instrument. The plate is therefore removable and can slide into a position along the instrument where it contacts a slide stop integral to the brackets. This causes the test wipe to be aligned directly under the sensor to provide consistent readings.
    Type: Grant
    Filed: July 22, 1997
    Date of Patent: August 10, 1999
    Assignee: S. E. International, Inc.
    Inventor: Susan M. Skinner
  • Patent number: 5932878
    Abstract: A nuclear imaging radiation system including a gamma camera which, in one embodiment, includes a scintillation crystal, a collimator and an array of photomultiplier tubes, is described. The collimator is positioned adjacent a face of the crystal, and defines a field of view. The array of photomultiplier tubes is positioned adjacent an opposite face of the crystal, and selected tubes outside the field of view are disabled so that light events outside of the field of view are not processed.
    Type: Grant
    Filed: May 9, 1997
    Date of Patent: August 3, 1999
    Assignee: General Electric Company
    Inventors: Floribertus Philippus Martinus Heukensfeldt Jansen, Daniel Robert Stafford Taylor
  • Patent number: 5925883
    Abstract: An IR focal plane array (IR-FPA) includes an IR radiation detector (11a) having a plurality of IR radiation responsive photodetectors (PDs) and a readout integrated circuit (11) that includes a plurality of unit cells arranged in an N.times.M matrix. Each unit cell has an input coupled to an output of one of the IR radiation responsive photodetectors. The IR-FPA further includes M column amplifiers, preferably CTIAs, individual ones of which have an input that is coupled through one of N switches (.phi.tr) to individual ones of the N unit cells. A charge integrating capacitance in each unit cell is formed by a charge well underlying one (.phi..sub.1) of a plurality of transfer gates coupled between individual ones of the N unit cells that are coupled to one of the M column amplifiers.
    Type: Grant
    Filed: July 25, 1997
    Date of Patent: July 20, 1999
    Assignee: Raytheon Company
    Inventor: James T. Woolaway, II
  • Patent number: 5923039
    Abstract: An ultraviolet transmittance analyzer for fabrics, translucent packaging, sunscreen products and the like using an internally pulsed white-light illuminated integrating sphere, exiting sample and reference diffusely reflected beams, and applying them respectively to separate sample and reference spectrographs with light detector arrays.
    Type: Grant
    Filed: September 16, 1997
    Date of Patent: July 13, 1999
    Assignee: Labsphere, Inc.
    Inventors: Joseph Jablonski, Norman Carlson
  • Patent number: 5923035
    Abstract: A measuring device for determining the concentration of gases with two identical radiation sources and two radiation detectors, which delivers stable measured values despite the contamination that occurs or the shielding from radiation of the outer optical surfaces exposed to the gases or to mixtures of gases and despite possible mechanical disadjustments. The two radiation detectors are provided with an optical concentrator each for bundling the radiation, and being arranged in a gas-tight housing together with the two identical radiation sources and with a beam splitter. One radiation source is directed through a window that is transparent to infrared light to a plane mirror outside the gas-tight housing, and the beam path reflected by the plane mirror falls through the window that is transparent to infrared light onto the beam splitter.
    Type: Grant
    Filed: August 21, 1997
    Date of Patent: July 13, 1999
    Assignee: Dragerwerk AG
    Inventors: Tobias Winkler, Horst-Dieter Hattendorff