Photoelectric Patents (Class 73/705)
  • Patent number: 10429499
    Abstract: The present invention provides a sensor system for measuring a parameter (e.g. volume, temperature or pressure) of a target, the system comprising a diaphragm, a sensor for measuring the axial spacing between the sensor and the diaphragm, and an axially adjustable mount. The mount has a first axial end for mounting the diaphragm which is axially movable relative to the sensor and an opposing, second axial end which is axially fixed relative to the sensor. The diaphragm and mount define a chamber for receiving the target or for being received within the target. In use, the axial spacing between the first axial end and the second axial end of the mount and thus the axial spacing between the diaphragm and sensor varies as a result of a change in the parameter differential across the diaphragm.
    Type: Grant
    Filed: February 21, 2017
    Date of Patent: October 1, 2019
    Assignee: ROLLS-ROYCE PLC
    Inventors: Francis Bridge, Martin A Smith, Bob E Wilson
  • Patent number: 10345515
    Abstract: The purpose of the present invention is to provide a bonded structure, a method for manufacturing the same, and a bonding state detection method which are capable of determining whether or not members are bonded together appropriately. A bonded structure 10 includes a laminated sheet 12A, a laminated sheet 12B, an adhesive 14 that bonds the laminated sheet 12A and the laminated sheet 12B together, and a distributed optical fiber 16 sandwiched between the laminated sheet 12A and the laminated sheet 12B. The cross-sectional shape of the distributed optical fiber 16 is deformed in accordance with the bonding state.
    Type: Grant
    Filed: January 6, 2016
    Date of Patent: July 9, 2019
    Assignees: MITSUBISHI HEAVY INDUSTRIES, LTD., THE UNIVERSITY OF TOKYO
    Inventors: Nozomi Saito, Takayuki Shimizu, Toshio Abe, Shu Minakuchi, Nobuo Takeda, Yutaka Terada
  • Patent number: 9778125
    Abstract: An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensing head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: October 3, 2017
    Assignee: Oxsensis Limited
    Inventors: Ralf-Dieter Pechstedt, Fabrice F. M. Maillaud
  • Patent number: 9759824
    Abstract: The application describes methods and apparatus for seismic monitoring using fiber optic distributed acoustic sensing (DAS). The method involves interrogating a first optical fiber (102) deployed in an area of interest to provide a distributed acoustic sensor comprising a plurality of longitudinal sensing portions of fiber and also monitoring at least one geophone (107) deployed in the area of interest. The signal from the at least one geophone is analyzed to detect an event of interest (105). If an event of interest is detected the data from the distributed acoustic sensor acquired during said event of interest is recorded. The geophone may be co-located with part of the sensing fiber and in some embodiments may be integrated (307) with the sensing fiber.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: September 12, 2017
    Assignee: Optasense Holdings Limited
    Inventors: Paul Gerard Edmond Lumens, Samantha Grandi
  • Patent number: 9638591
    Abstract: An electronic device includes an input surface area for receiving a force applied by a user and one or more optical waveguides that include Bragg gratings. The optical waveguide or waveguides is operatively affixed to the input surface area. At least one light source is optically coupled to the optical waveguide or waveguides. At least one wavelength interrogator is coupled to the optical waveguide or waveguides.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: May 2, 2017
    Assignee: Apple Inc.
    Inventor: Sam R. Sarcia
  • Patent number: 9588001
    Abstract: A pressure detecting apparatus made by 3D printing technologies being able to be used in dangerous areas is provided. It mainly comprises a light source, a processor, a coupler, and at least one pressure transducer. The pressure transducer comprises a main body and a fiber grating. The fiber grating comprises a fiber Bragg grating sensor, and the fiber grating is fixed on the main body and covers the fiber Bragg grating sensor. When the main body is placed in a fluid area, the fluid would flow through the opening to deform the strain layer and generate a strain variation on the fiber Bragg grating sensor to cause a signal variation in the reflection frequency spectrum. The coupler is configured to couple to the light source and the pressure transducer to decode the signal variation into pressure parameters.
    Type: Grant
    Filed: October 17, 2014
    Date of Patent: March 7, 2017
    Assignee: NATIONAL KAOHSIUNG UNIVERSITY OF APPLIED SCIENCES
    Inventors: Chia-Chin Chiang, Tso- Sheng Hsieh
  • Patent number: 9550023
    Abstract: A removable material is deposited or otherwise applied to a flat substrate surface in a pattern corresponding to desired corrugations in a membrane, e.g., a deflection diaphragm. The applied material serves as a scaffold for a polymeric material, which is applied thereover, and following cure or hardening, the polymeric material is removed to form a finished corrugated membrane.
    Type: Grant
    Filed: June 27, 2014
    Date of Patent: January 24, 2017
    Assignee: MiniPumps, LLC
    Inventors: Changlin Pang, Jason Shih, Fukang Jiang, Changgeng Liu, Sean Caffey, Andrew Urazaki
  • Patent number: 9480793
    Abstract: Some embodiments of an infusion pump system may include an occlusion sensor that can be used to detect when an occlusion exists in the fluid path between the medicine reservoir and the infusion site on the user's skin. Such an occlusion may occur, for example, when the fluid flow line (e.g., a cannula, infusion set tubing, or the like) is kinked. If the medicine dispensation path to the user is occluded, the user may receive no dosage or a lower dosage of the medicine. As such, the occlusion sensor can be used to indicate when the fluid is flowing or not flowing, thereby permitting the infusion pump system to communicate an alarm to the user if an occlusion exists.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: November 1, 2016
    Assignee: Bigfoot Biomedical, Inc.
    Inventors: Amit Mhatre, Jian Yao Wu, Mitchell Wenger, Steven M. Friedman
  • Patent number: 9448105
    Abstract: An optical sensor is disclosed for measuring pressure and/or temperature. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The optical sensor comprises an optical assembly having a sensor element, a spacer and a lens arranged along the optical axis. The sensor element is spaced from the lens by the spacer. An optical fiber is coupled to the optical assembly for illuminating the sensor element. The optical assembly is resiliently mounted in a housing such that the optical assembly is insulated from shock to the housing. There is also disclosed a method of assembling the optical sensor.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: September 20, 2016
    Assignee: Oxsensis Ltd.
    Inventors: Arnold Peter Roscoe Harpin, Stephen James Fasham, Stephen Geoffrey Tyler
  • Patent number: 9074957
    Abstract: The present invention relates to a high stable fiber fabry-perot pressure sensor with glue-free packing and its fabrication method. The sensor includes a sensor head, a sensor body with a through-hole in the axial direction and a optical fiber. The sensor head is a 4-layer structure, which includes the first silicon wafer, the first Pyrex glass wafer, the second silicon wafer and the second Pyrex glass wafer. The rear surface of the first silicon wafer forms the first reflecting surface of the fabry-perot (F-P) cavity, and the second silicon wafer provides the second reflecting surface for the F-P cavity. The second Pyrex glass wafer is welded together with the sensor body. The optical fiber is fixed in the sensor body by a CO2 laser welding to achieve the glue-free packing. When the external pressure is applied to deform the first layer silicon wafer, the F-P cavity length will change.
    Type: Grant
    Filed: May 28, 2012
    Date of Patent: July 7, 2015
    Assignee: Tianjin University
    Inventors: Junfeng Jiang, Tiegen Liu, Jinde Yin, Kun Liu, Yu Liu
  • Patent number: 9027218
    Abstract: An apparatus and method for finding part position relations of parts of mechanical and opto-mechanical machining and quality control systems, and for recognizing these parts, is disclosed. The present invention relies on optical contactless sensing technology, with recording of optical fiducial patterns and therefrom determining positions close to the work positions without physical contact. Part positions of machines are determined by associating or mechanically integrating fiducial patterns (1) with key parts, and optically detecting the images of these patterns. Part positions and displacements according to given part position finder (6) strategies are found, by associating fiducial pattern images (14) and machine position data (17) to parts that are members of a part geometry relation (15), and under part displacement constraints (16), finding given part positions or displacements (18).
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: May 12, 2015
    Inventor: Gudmunn Slettemoen
  • Patent number: 8973445
    Abstract: A holographic pressure sensing apparatus includes a first optical fiber with a diffractive element at its end face, and a light-coupling component for receiving from the first optical fiber end face first and second images respectively formed by interaction with the diffractive element of a first light of a first wavelength and a second light of a second wavelength. Displacement of the light-coupling component, toward or away from the first optical fiber end face, will adjust an overlap of the first and second images, such that a change in a measurement of said overlap will indicate a change of the pressure in the fluid surrounding the casing.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: March 10, 2015
    Assignee: Qorex LLC
    Inventors: Trevor Wayne MacDougall, Paul Eric Sanders
  • Patent number: 8966988
    Abstract: Ultra-miniature surface-mountable optical pressure sensor is constructed on an optical fiber. The sensor design utilizes an angled fiber tip which steers the optical axis of the optic fiber by 90°. The optical cavity is formed on the sidewall of the optic fiber. The optical cavity may be covered with a polymer-metal composite diaphragm to operate as a pressure transducer, Alternatively, a polymer-filled cavity may be constructed which does not need a reflective diaphragm. The sensor exhibits a sufficient linearity over the broad pressure range with a high sensitivity. The sensitivity of the sensor may he tuned by controlling the thickness of the diaphragm. Methods of batch production of uniform device-to-device optical pressure sensors of co-axial and cross-axial configurations are presented.
    Type: Grant
    Filed: April 5, 2012
    Date of Patent: March 3, 2015
    Assignee: University of Maryland
    Inventors: Miao Yu, Hyungdae Bae, Xuming Zhang
  • Publication number: 20150020598
    Abstract: Various embodiments include apparatus and methods to measure pressure using an optical fiber. The optical fiber can be structured with fiber Bragg gratings arranged along the optical fiber. Optical signals can be transmitted through the optical fiber, where the optical signals have a wavelength of a slow-light peak of a respective one of the fiber Bragg gratings. Signals resulting from the optical signals transmitted through the optical fiber can be detected and a value of pressure from the detected signals can be determined.
    Type: Application
    Filed: July 18, 2013
    Publication date: January 22, 2015
    Inventor: Yunmiao Wang
  • Publication number: 20150020599
    Abstract: An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensor head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.
    Type: Application
    Filed: March 13, 2013
    Publication date: January 22, 2015
    Inventors: Ralf-Dieter Pechstedt, Fabrice F.M. Maillaud
  • Publication number: 20140360276
    Abstract: A pressure sensing system includes a pressure sensor, an optical fiber in operable communication with the pressure sensor, and a body having a diaphragm integrally formed therein and separated a distance from the optical fiber.
    Type: Application
    Filed: June 7, 2013
    Publication date: December 11, 2014
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Carl W. Stoesz, Sydnee Marie Hammond
  • Publication number: 20140360484
    Abstract: A valve apparatus includes substantially co-aligned first and second valve seats and substantially co-aligned first and second valve members. The first valve member is moveable relative to the first valve seat between at least an open position in which the first valve member is spaced from the first valve seat and a closed position in which the first valve member is seated against the first valve seat. The second valve member is moveable relative to the second valve seat between at least an open position in which the second valve member is spaced from the second valve seat and a closed position in which the second valve member is seated against the second valve seat. An armature is operable for moving the first and second valve members, in response to a magnetic field generated by a coil.
    Type: Application
    Filed: August 25, 2014
    Publication date: December 11, 2014
    Inventors: Mark H. Stark, Mike C. Santinanavat, Ryan D. Jensen, John F. Broker
  • Patent number: 8850895
    Abstract: The disclosed invention describes an unpowered apparatus which can wirelessly sense pressure based on microfluidics for point-of-care glaucoma diagnosis. Moreover, the disclosed invention teaches methods to construct the invention using microfabrication processing. Finally, a detailed and illustrative schematic of the wireless readout system is disclosed.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: October 7, 2014
    Inventor: John Yan
  • Publication number: 20140290374
    Abstract: A combination of sensors are strategically placed along a pipeline to measure critical properties such as temperature and pressure of the flow product. The sensors are a combination of fiber optic sensing devices that are specifically designed to measure a range of properties within particular bandwidth, with a method to reduce light attenuation over the long pipeline distances. The pipeline is typically subsea and can range widely in diameter. In many cases the pipeline has a coating that acts as a barrier to the corrosive sea water and additional thermal barriers.
    Type: Application
    Filed: March 28, 2013
    Publication date: October 2, 2014
    Inventor: David V. Brower
  • Publication number: 20140208858
    Abstract: The present invention relates to a high stable fiber fabry-perot pressure sensor with glue-free packing and its fabrication method. The sensor includes a sensor head, a sensor body with a through-hole in the axial direction and a optical fiber. The sensor head is a 4-layer structure, which includes the first silicon wafer, the first Pyrex glass wafer, the second silicon wafer and the second Pyrex glass wafer. The rear surface of the first silicon wafer forms the first reflecting surface of the fabry-perot (F-P) cavity, and the second silicon wafer provides the second reflecting surface for the F-P cavity. The second Pyrex glass wafer is welded together with the sensor body. The optical fiber is fixed in the sensor body by a CO2 laser welding to achieve the glue-free packing When the external pressure is applied to deform the first layer silicon wafer, the F-P cavity length will change.
    Type: Application
    Filed: May 28, 2012
    Publication date: July 31, 2014
    Inventors: Junfeng Jiang, Tiegen Liu, Jinde Yin, Kun Liu, Yu Liu
  • Publication number: 20140202253
    Abstract: An optical sensor is disclosed for measuring pressure and/or temperature. The optical sensor is adapted for use in high temperature environments, such as gas turbines and other engines. The optical sensor comprises an optical assembly having a sensor element, a spacer and a lens arranged along the optical axis. The sensor element is spaced from the lens by the spacer. An optical fibre is coupled to the optical assembly for illuminating the sensor element. The optical assembly is resiliently mounted in a housing such that the optical assembly is insulated from shock to the housing. There is also disclosed a method of assembling the optical sensor.
    Type: Application
    Filed: August 9, 2012
    Publication date: July 24, 2014
    Applicant: OXSENSIS LTD
    Inventors: Arnold Peter Roscoe Harpin, Stephen James Fasham, Stephen Geoffrey Tyler
  • Patent number: 8752435
    Abstract: There is described a miniature fiber optic pressure sensor design where sensitivity around specific biased pressure is optimized. In an embodiment, the pressure sensor is a Fabry-Perot (FP) sensor which comprises a substrate; and a diaphragm mounted on the substrate. The diaphragm has a center and comprises: a first layer comprising a first material; and a second layer comprising a second material. The second layer forms a dot or a ring. The dot or ring is mounted on the first layer and is centered about the center of the diaphragm. The second material comprises internal pre-stresses to cause the center of the diaphragm (in the case of a dot) or the peripheral area about the center of the diaphragm (in the case of a ring) to camber away from the substrate upon relaxing the internal pre-stresses.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: June 17, 2014
    Inventors: Claude Belleville, Sebastien Lalancette, Nicolas Lessard
  • Patent number: 8752434
    Abstract: A fiber optical system for pressure measurement has a pressure sensor element (4) with at least two parallel partially reflecting surfaces (5, 7), one of which is arranged on a diaphragm (6) movable with respect to another fixed said surface as a consequence of pressure differences across said diaphragm. Said surfaces are arranged so as to cause interference phenomena of light inciding substantially perpendicularly onto and reflected by the two surfaces depending upon the actual 10 distance between these surfaces. The pressure sensor element is made of material being stable at a continuous temperature up to at least 800° C. At least said diaphragm (6) of the sensor element is made of Si C, and at least a part (23) of the optical fiber (3) connecting to said sensor element is made of a material able to withstand a continuous temperature of at least 800° C.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: June 17, 2014
    Assignee: Simea Optic AB
    Inventor: Håkan Johansson
  • Publication number: 20140123764
    Abstract: A new type of optical pressure sensor with adjustable sensitivity is proposed based on the fiber Bragg grating (FBG). In this technique, the pressure changes the length of a metal bellows which is placed behind a spring. The fiber grating is fixed over the bellows between a fixed position and the connection point of bellows and spring. The wavelength change of FBG is caused by the change in the bellows length; however, the spring controls the total length expansion of the bellows. It will bring two benefits: first it is easy to change the pressure sensing range by changing the spring rate; and secondly the spring improves the linearity of the wavelength sift due to the pressure. The FBG is installed outside of the bellows and is not in contact with the material in which the pressure should be measured (gas or liquid) in contrast with other pressure sensors where the FBG is inside the bellows.
    Type: Application
    Filed: November 5, 2012
    Publication date: May 8, 2014
    Inventors: Mohammad Abtahi, Pin Long, Nikolay Naydenov
  • Patent number: 8718419
    Abstract: A fiber Bragg grating (FBG) based sensor is used as a strain sensing element to determine frame foot loading of a generator. Three FBGs may be used in tandem to form a basic Frame Foot Loading Module (FFL Module). Two modules are fixed on each vertical support gusset at the corner of the generator frame, with one module on the front of the gusset and a second module on the back of the gusset. Thus, each gusset may be instrumented with six FBG strain gauges or sensors. The gussets are chosen on each of the four corners of the generator. For two-pole generators the first three gussets at each corner may be used and, for four-pole generators the first four gussets may be used.
    Type: Grant
    Filed: August 15, 2012
    Date of Patent: May 6, 2014
    Assignee: Siemens Energy, Inc.
    Inventors: Evangelos V. Diatzikis, Jonathan R. Anderson, David A. Reed
  • Patent number: 8707790
    Abstract: Method for optical pressure measurement of a gas in a closed container by directing a radiation of a radiator through the container and measuring the transmitted radiation by a detector, wherein the radiation of the radiator covers at least one first wavelength range in which there is an absorption of the radiation by the gas, the intensity of the transmitted radiation is detected in a second wavelength range by the detector, wherein the second wavelength range overlaps at least partially with the first wavelength range, and an accumulated intensity of the detected radiation in the second wavelength range is assigned to a pressure of the gas.
    Type: Grant
    Filed: May 20, 2010
    Date of Patent: April 29, 2014
    Assignee: Heuft Systemtechnik GmbH
    Inventors: Bernd Baumann, Marcus Wolff
  • Patent number: 8695430
    Abstract: Systems and methods that are capable of measuring pressure or temperature based on luminescence are discussed herein. These systems and methods are based on spin-allowed broadband luminescence of sensors with orthorhombic perovskite structures of rare earth aluminates doped with chromium or similar transition metals, such as chromium-doped gadolinium aluminate. Luminescence from these sensors can be measured to determine at least one of temperature or pressure, based on either the intense luminescence of these sensors, even at high temperatures, or low temperature techniques discussed herein.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: April 15, 2014
    Assignee: The United States of America as Represented by the Administrator of National Aeronautics and Space Administration
    Inventors: Jeffrey I. Eldridge, Matthew D. Chambers
  • Patent number: 8680467
    Abstract: A method of obtaining submicron resolution IR absorption data from a sample surface. A probe microscope probe interacts with the sample surface while a tunable source of IR radiation illuminates the sample-tip interaction region. The source is modulated at a frequency substantially overlapping the resonant frequency of the probe and may be modulated at the contact resonance frequency of the probe when the probe is in contact with the sample surface. The modulation frequency is continually adjusted to account for shifts in the probe resonant frequency due to sample or other variations. A variety of techniques are used to observe such shifts and accomplish the adjustments in a rapid manner.
    Type: Grant
    Filed: September 19, 2011
    Date of Patent: March 25, 2014
    Assignee: Anasys Instruments Corp.
    Inventors: Craig Prater, Kevin Kjoller
  • Publication number: 20140060199
    Abstract: A holographic pressure sensing apparatus includes a first optical fiber with a diffractive element at its end face, and a light-coupling component for receiving from the first optical fiber end face first and second images respectively formed by interaction with the diffractive element of a first light of a first wavelength and a second light of a second wavelength. Displacement of the light-coupling component, toward or away from the first optical fiber end face, will adjust an overlap of the first and second images, such that a change in a measurement of said overlap will indicate a change of the pressure in the fluid surrounding the casing.
    Type: Application
    Filed: September 5, 2012
    Publication date: March 6, 2014
    Applicant: QOREX LLC
    Inventors: Trevor Wayne MacDougall, Paul Eric Sanders
  • Publication number: 20140007694
    Abstract: A sensor device for use in a medical fluid delivery system, or an infusion pump device, comprises a fluidic chamber with a deformable cover closing at least an area of the chamber and an optical detection system comprising at least one light emitter for emitting one or more incident light beams and a sensor unit for monitoring one or more reflected light beams is presented. In a pressurized state of the fluidic chamber, the deformable cover is deformed such that it forms an inflexion point area within the deformed cover. The one or more incident light beams emitted by the light emitter are directed on the cover such that the one or more incident light beams are reflected essentially in the inflexion point area.
    Type: Application
    Filed: September 13, 2013
    Publication date: January 9, 2014
    Applicant: ROCHE DIAGNOSTICS INTERNATIONAL AG
    Inventors: Andreas Geipel, Pascal Grossenbacher, Philipp Michel, Ulrich Haueter
  • Patent number: 8590385
    Abstract: The present application provides a fiber optic sensor system. The fiber optic sensor system may include a small diameter bellows, a large diameter bellows, and a fiber optic pressure sensor attached to the small diameter bellows. Contraction of the large diameter bellows under an applied pressure may cause the small diameter bellows to expand such that the fiber optic pressure sensor may measure the applied pressure.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: November 26, 2013
    Assignee: General Electric Company
    Inventors: Renato Guida, Hua Xia, Boon K. Lee, Sachin N. Dekate
  • Publication number: 20130255390
    Abstract: A pressure sensor for use with a fluid delivery system having good sensitivity at low pressure, but also configured to remain in operating condition after being exposed to high pressures is disclosed herein. In one variation, the pressure sensor includes a fluid path set, a deformable element associated with the fluid path set and configured to deform in response to an external pressure, and a pressure transducer for monitoring deformation of the deformable element. In certain embodiments, the pressure sensor is configured to measure fluid pressure within the range of between about 0 mm Hg to about 300 mm Hg. However, the sensor pressure is also be configured to remain functional after being exposed to pressure in excess of about 60,000 mm Hg.
    Type: Application
    Filed: March 13, 2013
    Publication date: October 3, 2013
    Applicant: MEDRAD, INC.
    Inventors: Michael A. Riley, Michael A. Spohn, Gerald W. Callan, Michael J. Swantner, Russell M. Evans, III
  • Publication number: 20130220021
    Abstract: Provided is a modified fluorescent protein which enables the detection of a power applied to a liquid where the fluorescent protein exists. A modified fluorescent protein, wherein a peptide linker is inserted into a position homologous to the position between the 144th and 145th amino acids in the amino acid sequence of a wild type fluorescent protein from jellyfish or a fluorescent protein derived from said wild type fluorescent protein, characterized in that the fluorescence properties of said modified fluorescent protein change depending on a change in a pressure that is applied to a liquid where said modified fluorescent protein exists.
    Type: Application
    Filed: November 10, 2011
    Publication date: August 29, 2013
    Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCY
    Inventors: Tomonobu Watanabe, Keiko Yoshizawa
  • Publication number: 20130145852
    Abstract: The present application provides a fiber optic sensor system. The fiber optic sensor system may include a small diameter bellows, a large diameter bellows, and a fiber optic pressure sensor attached to the small diameter bellows. Contraction of the large diameter bellows under an applied pressure may cause the small diameter bellows to expand such that the fiber optic pressure sensor may measure the applied pressure.
    Type: Application
    Filed: December 12, 2011
    Publication date: June 13, 2013
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Renato Guida, Hua Xia, Boon K. Lee, Sachin N. Dekate
  • Publication number: 20130150225
    Abstract: One embodiment relates to a pressure sensor apparatus, including a housing with a flexible member and an aperture configured to receive a fluid. The pressure sensor apparatus further includes a first member disposed on the flexible member, a second member removeably coupled to the first member configured to move in response to a pressure of the fluid and a sensor configured to detect the movement of the second member.
    Type: Application
    Filed: October 23, 2012
    Publication date: June 13, 2013
    Applicant: Fenwal, Inc.
    Inventor: Fenwal, Inc.
  • Patent number: 8417084
    Abstract: Disclosed herein is a carrier for an optical fiber having a plurality of optical sensors located thereon. The carrier has a test section comprising a cavity and at least one geometric discontinuity, wherein in response to a pressure applied to the test section, a stress concentration is formed proximate to the geometric discontinuity, and wherein the optical sensor is adhered to at least a part of the geometric discontinuity. The cavity may be filled with a liquid or a gel. A temperature optical sensor may also be provided adjacent to the pressure optical sensor.
    Type: Grant
    Filed: July 2, 2008
    Date of Patent: April 9, 2013
    Assignee: Baker Hughes Incorporated
    Inventors: Carl W. Stoesz, Clark Davis Boyd
  • Patent number: 8402834
    Abstract: A temperature correcting pressure gauge which has a substrate having at least one surface coupled to a source of pressure to be measured, the substrate first surface having a first fiber Bragg grating from a first optical fiber attached in an appropriately sensitive region of the substrate, a fiber Bragg grating from a second optical fiber attached to the opposite surface from the first fiber Bragg grating, the first and second fiber Bragg gratings reflecting or transmitting optical energy of decreasing or increasing wavelength, respectively, in response to an applied pressure. The first and second fiber Bragg gratings have nominal operating wavelength ranges that are adjacent to each other but are exclusive ranges and the fiber Bragg gratings also have closely matched pressure coefficients and temperature coefficients.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: March 26, 2013
    Assignee: Intelligent Fiber Optic Systems, Inc.
    Inventors: Behzad Moslehi, Joannes M. Costa
  • Publication number: 20130069603
    Abstract: A container of an electrochemical double-layer capacitor for holding electrodes and electrolyte includes a housing having a cavity and a cap portion coupled to the housing forming a fluid-tight reservoir with the cavity. The container also includes a plurality of terminals incorporated into one or more of the housing or the cap portion, where the plurality of terminals adapted to be electrically coupled to the electrodes, and a pressure-compliant membrane incorporated into one of the housing or the cap portion. A pressure monitoring system that monitors the pressure inside the container includes a displacement measuring device adapted to measure a deflection of the pressure-compliant membrane.
    Type: Application
    Filed: September 20, 2011
    Publication date: March 21, 2013
    Inventors: Robert Wendell Sharps, Todd Marshall Wetherill
  • Publication number: 20130055819
    Abstract: The disclosed invention describes an unpowered apparatus which can wirelessly sense pressure based on microfluidics for point-of-care glaucoma diagnosis. Moreover, the disclosed invention teaches methods to construct the invention using microfabrication processing. Finally, a detailed and illustrative schematic of the wireless readout system is disclosed.
    Type: Application
    Filed: December 20, 2011
    Publication date: March 7, 2013
    Inventor: John Yan
  • Publication number: 20130055818
    Abstract: Processes of identifying small pressure irregularities in a system used for continuous plasma deposition are provided. Sensitive light scattering is used to detect the presence of nucleated particles in a detection area that is outside the plasma region of high electric field whereby the presence of the particles indicates a pressure abnormality in the plasma deposition chamber. The pressure of the plasma deposition chamber is then adjusted to reduce or eliminate the presence of particles within the detection area and to optimize deposition of material on a substrate.
    Type: Application
    Filed: September 1, 2011
    Publication date: March 7, 2013
    Applicant: United Solar Ovonic LLC
    Inventor: Joachim Doehler
  • Patent number: 8374834
    Abstract: A statistical methodology is disclosed to provide time-to-event estimates for oilfield equipment. A method according to the present invention extracts unbiased information from equipment performance data and considers parameters interactions without recourse to data thinning. The analysis explicitly accounts for items of equipment that are still operational at the time of analysis. A method according to the present invention may also be utilized to apply survival analysis to any oilfield equipment components where time-to-event information has been recorded. The method of the present invention allows comparative reckoning between different components present in the system comprising several or many individual components and allows analysis of these components either individually or simultaneously, i.e., in the presence of other components.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: February 12, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: William J. Bailey, Benoit Couet, James R. Hogan, Iain S. Weir
  • Patent number: 8344314
    Abstract: A pressure sensor is disclosed with at least one pressure sensing element, the pressure induced changes in the optical properties of which are evaluated by illumination with at least one light source. The pressure sensor can include at least two semiconductor-based pressure sensing elements located in individual pressure chambers, which sensing elements are located essentially adjacent to each other. The sensing elements can be irradiated with the same light source, wherein the light transmitted through the sensing elements is detected using at least two corresponding detectors, and wherein the differential pressure in the two pressure chambers is evaluated based on the output of these detectors.
    Type: Grant
    Filed: January 11, 2010
    Date of Patent: January 1, 2013
    Assignee: ABB Research Ltd
    Inventors: Axel Kramer, Frank Kassubek, Klaus Bohnert, Hubert Braendle
  • Publication number: 20120318067
    Abstract: A fluid pressure monitoring apparatus for use in high temperature, harsh environment applications, is described. The apparatus comprises an elongated member, having a free end and a fixed end, and a blind bore extending through the elongated member the bore having an opening through which fluid is provided to the bore when in use. The bore is offset from a central axis of the elongated member such that the elongated member deflects in response to the pressure of the fluid when provided to the bore. The apparatus further comprises a sensing device adapted to sense the change in distance between a first position, and a second position, in response to the deflection of the elongated member.
    Type: Application
    Filed: February 15, 2011
    Publication date: December 20, 2012
    Applicant: SMART FIBRES LIMITED
    Inventors: Crispin Doyle, Oleg Bogdanov
  • Publication number: 20120266681
    Abstract: Method for optical pressure measurement of a gas in a closed container by directing a radiation of a radiator through the container and measuring the transmitted radiation by a detector, wherein the radiation of the radiator covers at least one first wavelength range in which there is an absorption of the radiation by the gas, the intensity of the transmitted radiation is detected in a second wavelength range by the detector, wherein the second wavelength range overlaps at least partially with the first wavelength range, and an accumulated intensity of the detected radiation in the second wavelength range is assigned to a pressure of the gas.
    Type: Application
    Filed: May 10, 2010
    Publication date: October 25, 2012
    Applicant: HOCHSCHULE FUER ANGEWANDTE WISSENSCHAFTEN HAMBURG
    Inventors: Bernd Baumann, Marcus Wolff
  • Publication number: 20120255363
    Abstract: The sensor includes a deformable diaphragm responsive to applied pressure and a rigid beam mounted to move as the diaphragm deforms. The rigid beam includes a mirrored surface for receiving light from and reflecting light into an optical fiber thereby forming a Fabry-Perot cavity to detect changes in the position of the rigid beam. The rigid beam further includes inter-digital fingers extending from the mirrored surface and moving with the rigid beam with respect to fixed inter-digital fingers to create a change in electrical charges in the fingers to detect changes in the position of the rigid beam thereby providing two measures of rigid beam displacement which are measures of pressure. In a preferred embodiment, the optical fiber is a single mode optical fiber.
    Type: Application
    Filed: March 5, 2012
    Publication date: October 11, 2012
    Applicants: King Fahd University of Petroleum and Minerals, Massachusetts Institute of Technology
    Inventors: Muhammad A. Hawwa, Kamal Youcef-Toumi, Hussain Al-Qahtani
  • Publication number: 20120227505
    Abstract: There is described a miniature fiber optic pressure sensor design where sensitivity around specific biased pressure is optimized. In an embodiment, the pressure sensor is a Fabry-Perot (FP) sensor which comprises a substrate; and a diaphragm mounted on the substrate. The diaphragm has a center and comprises: a first layer comprising a first material; and a second layer comprising a second material. The second layer forms a dot or a ring. The dot or ring is mounted on the first layer and is centered about the center of the diaphragm. The second material comprises internal pre-stresses to cause the center of the diaphragm (in the case of a dot) or the peripheral area about the center of the diaphragm (in the case of a ring) to camber away from the substrate upon relaxing the internal pre-stresses.
    Type: Application
    Filed: March 8, 2012
    Publication date: September 13, 2012
    Applicant: Opsens inc.
    Inventors: Claude Belleville, Sébastien Lalancette, Nicolas Lessard
  • Publication number: 20120210797
    Abstract: Ultra-miniature surface-mountable optical pressure sensor is constructed on an optical fiber. The sensor design utilizes an angled fiber tip which steers the optical axis of the optic fiber by 90°. The optical cavity is formed on the sidewall of the optic fiber. The optical cavity may be covered with a polymer-metal composite diaphragm to operate as a pressure transducer. Alternatively, a polymer-filled cavity may be constructed which does not need a reflective diaphragm. The sensor exhibits a sufficient linearity over the broad pressure range with a high sensitivity. The sensitivity of the sensor may be tuned by controlling the thickness of the diaphragm. Methods of batch production of uniform device-to-device optical pressure sensors of co-axial and cross-axial configurations are presented.
    Type: Application
    Filed: April 5, 2012
    Publication date: August 23, 2012
    Applicant: UNIVERSITY OF MARYLAND
    Inventors: Miao YU, Hyungdae BAE, Xuming ZHANG
  • Patent number: 8240215
    Abstract: A technique for measuring pressure of a material directs one or more laser beams at the material (e.g., a pressurized fluid) to create a distribution of electromagnetic field intensity which varies over an intensity range and induces dielectric breakdown in the material. An emission pattern of broadband light from the dielectric breakdown is detected, and a value of a characteristic of the emission pattern (e.g., location of a threshold intensity or of a peak intensity) is processed (e.g., by a computer or similar electronic processor) to generate a pressure measurement signal representing a pressure of the material. Processing typically employs a pre-established calibration function which associates a set of stored values of the characteristic with corresponding known pressures of the material, obtained for example by preceding similar measurements of the same material under conditions of known pressures.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: August 14, 2012
    Inventors: Ray Glynn Holt, Todd William Murray, Jonathan Robert Sukovich
  • Patent number: 8205504
    Abstract: An optical fiber sensing device for detecting physical parameters such as pressures, strains and temperatures comprises a probe housing therein an optical fiber. The distal end of the probe houses a distal portion of the optical fiber having a section provided with a fiber Bragg grating. The proximal end of the probe is mounted into a holder. The optical fiber is sealably mounted into the probe housing with a first seal overlaid the proximal portion of the optical fiber The seal may extend to about the proximal end of the optical fiber section with the Bragg grating. A second seal is overlaid the distal portion of the optical fiber and extends from the distal end of the probe to about the distal end of the optical fiber section with the Bragg grating. The proximal end of the probe is communicable with a fiber Bragg grating interrogation system.
    Type: Grant
    Filed: May 21, 2009
    Date of Patent: June 26, 2012
    Assignee: UVic Industry Partnerships Inc.
    Inventors: Christopher Raymond Dennison, Peter Martin Wild
  • Patent number: 8176790
    Abstract: A pressure sensor assembly comprises a sensor housing having a flexible wall that is configured to deform in response to a pressure difference between the interior and exterior of the sensor housing; -a first fiber optical cable section that is bonded to the flexible wall of the sensor housing such that the length of the first fiber optical cable section changes in response to deformation of the wall in response to the said pressure difference; a second fiber optical cable section which is bonded to a thermal reference body, which body is connected to the sensor housing by a strain decoupled connection mechanism, such as a tack weld or flexible glue, and is configured to deform substantially solely in response to thermal deformation, such that the length of the second fiber optical cable section solely changes in response to thermal deformation of the thermal reference body.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: May 15, 2012
    Assignee: Shell Oil Company
    Inventors: William Birch, Johannis Josephus Den Boer, Crispin Thomas Matthew Doyle, Andre Franzen, Kari-Mikko Jääskeläinen, Christopher Barry Staveley