Optical Patents (Class 324/244.1)
  • Patent number: 10401439
    Abstract: In one embodiment, a method is provided.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: September 3, 2019
    Assignee: Honeywell International Inc.
    Inventors: Marc Smiciklas, Robert Compton, Mary K. Salit
  • Patent number: 10393825
    Abstract: A manufacturing method for a gas cell includes disposing a holding member including a coating material in a reservoir of a cell having a main chamber, the reservoir communicating with the main chamber, and an opening provided in the reservoir, sealing the cell, heating the holding member so as to generate a vapor of the coating material in the cell, and cooling the cell so as to form a film of the coating material on an inner wall of the cell.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: August 27, 2019
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Tatsunori Miyazawa
  • Patent number: 10379174
    Abstract: A magnetometer includes a light source that provides excitation light and a magneto-optical defect center material with at least one defect center that transmits emitted light when excited by the excitation light. The magnetometer also includes a light sensor that receives the emitted light and a plurality of magnets that provide a bias magnetic field to the magneto-optical defect center material. The magnetometer further includes a ring magnet holder that has an outer ring with an outside surface and a plurality of holders extending from the ring. The plurality of holders hold the plurality of magnets in a same orientation with respect to one another. The magnetometer further includes a mount that has an inside surface. The outside surface of the outer ring slides along the inside surface of the mount.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: August 13, 2019
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Joseph W. Hahn, Andrew Raymond Mandeville, Gregory Scott Bruce, Arul Manickam, Peter G. Kaup
  • Patent number: 10345396
    Abstract: A system for magnetic detection, includes a magneto-optical defect center material comprising a plurality of magneto-optical defect centers, a radio frequency (RF) excitation source, an optical detector and an optical light source. The RF excitation source is configured to provide RF excitation to the material. The optical detector is configured to receive an optical signal emitted by the material. The optical light source is configured to provide optical light to the material, and includes a readout optical light source and a reset optical light source. The readout optical light source is configured to illuminate light in a first illumination volume of the material. The reset optical light source is configured to illuminate light in a second illumination volume of the material, the second illumination volume being larger than and encompassing the first illumination volume. The reset optical light source provides a higher power light than the readout optical light source.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: July 9, 2019
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Arul Manickam, Peter G. Kaup, Gregory Scott Bruce, Wilbur Lew
  • Patent number: 10338163
    Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material, a radio frequency (RF) excitation source that provides RF excitation to the NV diamond material, an optical excitation source that provides optical excitation to the NV diamond material, an optical detector that receives an optical signal emitted by the NV diamond material, a magnetic field generator that generates a magnetic field applied to the NV diamond material, and a controller. The controller controls the RF excitation source to apply a first RF excitation having a first frequency and a second RF excitation having a second frequency. The first frequency is associated with a first slope point of a fluorescence intensity response of an NV center orientation of a first spin state, and the second frequency is associated with a second slope point of the fluorescence intensity response of the NV center orientation of the first spin state.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: July 2, 2019
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Peter G. Kaup, Arul Manickam, Gregory Scott Bruce
  • Patent number: 10330602
    Abstract: An optical sensing platform with an array of sensors, a laser or broadband light source and an optical detector that utilizes surface plasmon resonance based transduction and optical detection is provided. The sensor structure of the platform has a low index support layer, a high contrast grating, a low index spacer and a thin metal film with a target recognition element. The surface plasmon resonance based sensor uses surface plasmon waves to detect changes on the surface of the sensor when a target interacts with the target recognition element. The binding of the target with a recognition element receptor will induce changes in the refractive index of the metal layer, which changes the resonance wavelength of the plasmon wave on the sensor surface, which is used to measure or observe the reaction.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: June 25, 2019
    Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
    Inventors: Connie Chang-Hasnain, Tianbo Sun, Li Zhu, Fang Liu
  • Patent number: 10324142
    Abstract: A diamond crystal according to the present invention has an NV region containing a complex (NV center) of nitrogen substituted with a carbon atom and a vacancy located adjacent to the nitrogen, on a surface or in the vicinity of the surface, wherein the NV region has a donor concentration equal to or higher than the concentration of the NV centers, or a crystal of the NV region is a {111} face or a face having an off-angle that is ±10 degrees or less against the {111} face, and a principal axis of the NV center is a <111> axis that is perpendicular to the {111} face. Such a diamond crystal enables almost 100% of the NV center to be a state (NV?) of having a negative electric charge, and spin states of the NV? centers to be aligned in one direction.
    Type: Grant
    Filed: January 19, 2015
    Date of Patent: June 18, 2019
    Assignees: JAPAN SCIENCE AND TECHNOLOGY AGENCY, NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Mutsuko Hatano, Takayuki Iwasaki, Norikazu Mizuochi, Toshiharu Makino, Hiromitsu Kato, Satoshi Yamasaki
  • Patent number: 10260969
    Abstract: A microfabricated magnetic resonator is provided. The microfabricated magnetic resonator has one or more resonator portions, each of which is a magnetoelastic resonating structure having a maximum circumference or maximum linear dimension in at least one direction that is less than 1000 ?m. At least one of the resonator portions comprises an electrodeposited material comprising at least a cobalt constituent and an iron constituent.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: April 16, 2019
    Assignee: National Technology & Engineering Solutions of Sandia, LLC
    Inventors: Jamin Ryan Pillars, Eric Langlois, Christian Lew Arrington, Todd Monson
  • Patent number: 10261350
    Abstract: An optical transmitting apparatus includes a variable optical attenuator of a magneto-optical effect type disposed by spatial coupling between a light source and an optical fiber, the variable optical attenuator configured to attenuate light output from the light source and coupled to the optical fiber, according to an input driving voltage; a generator configured to generate the driving voltage of the variable optical attenuator based on information to be superimposed on the light by the variable optical attenuator, the generator inputting the generated driving voltage into the variable optical attenuator; and a controller configured to control a bias of the driving voltage generated by the generator, the controller controlling an amplitude of the driving voltage generated by the generator, based on data according to characteristics between the driving voltage and an attenuation amount of the light by the variable optical attenuator.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: April 16, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Goji Nakagawa, Yoshio Hirose, Kyosuke Sone
  • Patent number: 10180479
    Abstract: A method of inducing spin polarization in an analyte is provided. The method exposes 14N spin defect centers embedded within 25 nm of a diamond surface to a magnetic field while an analyte is near the surface. The 14N spin defect centers are polarized by treatment with an electromagnetic wave protocol having a visible light pulse (p0); a microwave pulse (mw1), a radio frequency pulse (rf1), a microwave pulse (mw2) and a radio frequency pulse (rf2) resulting in polarization of the nuclear spins of the 14N spin defect centers. Polarized spins in the 14N spin defect centers induce spin polarization in the analyte.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: January 15, 2019
    Assignee: Research Foundation of the City University of New York
    Inventors: Carlos A. Meriles, Daniela Pagliero, Abdelghani Laraoui
  • Patent number: 10114083
    Abstract: An optical magnetometer comprising: an optical resonator having a central void; and a magnetostrictive material located in the central void such that a change in dimension of the magnetostrictive material causes a change in mechanical modes of the optical resonator. Also a method of making the optical magnetometer.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: October 30, 2018
    Assignee: THE UNIVERSITY OF QUEENSLAND
    Inventors: Stefan Forstner, Eoin Sheridan, Warwick P. Bowen
  • Patent number: 10080091
    Abstract: A signal processing device is provided for acquisition of predetermined information. The signal processing device includes a light source unit configured to radiate beams of coherent light having a plurality of wavelengths; an imaging unit configured to capture a speckle image representing an interference state of reflected light caused by the light radiated from the light source unit to an object; and a processing unit configured to process, for each of the wavelengths, the speckle image captured by the imaging unit. The processing unit acquires the predetermined information by analyzing a variation amount of the speckle image acquired for each of the wavelengths. The light source unit radiates beams of light having different wavelengths to a plurality of respective objects. The present technology can be applied to a sensor.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: September 18, 2018
    Assignee: SONY CORPORATION
    Inventor: Masanori Iwasaki
  • Patent number: 10048444
    Abstract: An optical system for optical communications includes: a signal light exit portion, a first coupler optical system that collects the signal light, a first collimator optical system that collimates the signal light into a parallel light, an optical signal-operating portion that reflects the parallel light, a second collimator optical system that collects the parallel light reflected, a second coupler optical system that collects signal light, and a signal light-receiving portion that receives the signal light incident, wherein: the first collimator optical system is defined by a decentered optical system that includes a reflective surface that tilts with respect to an optical axis of incident signal light and is capable of reflection, and the second collimator optical system is defined by a second decentered optical system that includes a reflective surface that tilts with respect to an optical axis of incident signal light and is capable of internal reflection.
    Type: Grant
    Filed: April 4, 2017
    Date of Patent: August 14, 2018
    Assignee: OLYMPUS CORPORATION
    Inventor: Koichi Takahashi
  • Patent number: 10012704
    Abstract: Methods and configurations are disclosed for providing band-pass magnetic filtering of signals in magnetic communications and anomaly detection using diamond nitrogen-vacancy (DNV).
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: July 3, 2018
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventor: David Nelson Coar
  • Patent number: 9910105
    Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.
    Type: Grant
    Filed: June 10, 2016
    Date of Patent: March 6, 2018
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Brian P. Boesch, Gregory Scott Bruce, Jeff D. Cammerata, David Nelson Coar, Laird Nicholas Egan, Bryan Neal Fisk, Wilbur Lew, Arul Manickam, Stephen Michael Sekelsky, John B. Stetson, Jr., Peter G. Kaup, Julie Lynne Miller, Jon C. Russo, Emanuel Solomon Stockman, Thomas J. Meyer, James Michael Krause, James P. Mabry, Elton Pepa
  • Patent number: 9910104
    Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: March 6, 2018
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Brian P. Boesch, Gregory Scott Bruce, Jeff D. Cammerata, David Nelson Coar, Laird Nicholas Egan, Bryan Neal Fisk, Wilbur Lew, Arul Manickam, Stephen Michael Sekelsky, John B. Stetson, Jr., Peter G. Kaup, Julie Lynne Miller, Jon C. Russo, Emanuel Solomon Stockman
  • Patent number: 9844405
    Abstract: Described is an apparatus for locally monitoring nerve activity that may be incorporated into a nerve ablation catheter. Such a catheter is equipped with magnetic sensing for both identifying nerves and assessing the success of the ablation. The catheter is also equipped with an ablation instrument for both stimulating and destroying nerve tissue.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: December 19, 2017
    Assignee: Cardiac Pacemakers, Inc.
    Inventors: Jan Weber, Torsten Scheuermann, Roger Hastings
  • Patent number: 9829544
    Abstract: One example embodiment includes an atomic sensor system. The system includes a magnetic field generator configured to generate a magnetic field in a volume. The system also includes a vapor cell arranged within the volume and comprising a polarized alkali metal vapor. The system further includes at least one magnetic field trimming system configured to generate a magnetic field gradient within the vapor cell separate from the magnetic field to provide a substantially uniform collective magnetic field within the vapor cell.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: November 28, 2017
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventor: Michael D. Bulatowicz
  • Patent number: 9829728
    Abstract: Methods for forming magneto-optical films for integrated photonic devices and integrated photonic devices incorporating same are described. An optical isolator or any nonreciprocal photonic component for an integrated photonic device can be fabricated by depositing a functional garnet layer directly onto a non-garnet substrate; depositing a seed garnet layer on the functional garnet layer; and after depositing both the functional garnet layer and the seed layer performing an annealing process. Since the seed garnet layer crystalizes faster than the functional garnet layer, crystallization of the functional garnet layer can be accomplished directly on the non-garnet substrate during a single annealing step for the seed layer and the functional garnet layer.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: November 28, 2017
    Assignee: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventors: Xueyin Sun, Mehmet Cengiz Onbasli, Caroline Anne Ross
  • Patent number: 9823314
    Abstract: A device includes a diamond with one or more nitrogen vacancies, a light emitting diode configured to emit light that travels through the diamond, and a photo sensor configured to sense the light. The device also includes a processor operatively coupled to the photo sensor. The processor is configured to determine, based on the light sensed by the photo sensor, a magnetic field applied to the diamond.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: November 21, 2017
    Assignee: Lockheed Martin Corporation
    Inventors: Joseph W. Hahn, Gregory S. Bruce, Wilbur Lew
  • Patent number: 9817081
    Abstract: A device includes a diamond assembly. The diamond assembly includes a diamond with a plurality of nitrogen vacancy centers and electrical components that emit electromagnetic waves. The device also includes a light source configured to emit light toward the diamond and a photo detector configured to detect light from the light source that traveled through the diamond. The device further includes an attenuator between the diamond assembly and the photo detector. The attenuator is configured to attenuate the electromagnetic waves emitted from the electrical components of the diamond assembly.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: November 14, 2017
    Assignee: Lockheed Martin Corporation
    Inventors: Joseph W. Hahn, Gregory S. Bruce, Duc Huynh, Wilbur Lew
  • Patent number: 9784804
    Abstract: Long spin coherence lifetimes are realized for ensembles of electronic spin impurities in solid state spin systems, for example NV color centers in diamond, by using spin-control RF pulse sequences to provide dynamic decoupling of the ensembles of spin impurities from environmental sources of decoherence such as dipolar and hyperfine interactions with proximal spin and other paramagnetic impurities in diamond. In this way, the measurement sensitivity of the coherent evolution of ensembles of solid state spin impurities are increased. Using the Carr-Purcell-Meiboom-Gill (CPMG) pulse sequence, the spin coherence lifetimes of NV ensembles can be extended to more than 2 ms in room temperature diamond, and sensitivity of magnetometry that uses NV ensembles can be increased.
    Type: Grant
    Filed: June 13, 2012
    Date of Patent: October 10, 2017
    Assignee: PRESIDENT AND FELLOWS OF HARVARD COLLEGE
    Inventors: Ronald Walsworth, Linh My Pham
  • Patent number: 9768876
    Abstract: A method of suppressing polarization-dependent loss in a signal. A constant-intensity, analog, optical signal with modulating polarization is transmitted through an optical communications link. The constant-intensity, analog, optical signal with modulating polarization includes an analog radio frequency signal impressed upon a polarization-modulated, laser signal. A polarization-dependent loss of the communications link is determined, the polarization-dependent loss inducing an induced phase shift in the constant-intensity, analog, optical signal with modulating polarization. The constant-intensity, analog, optical signal with modulating polarization is re-oriented using a polarization transformer so as to suppress the induced phase shift.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: September 19, 2017
    Assignee: The Government of the United States of America, as represented by the Secretary of the Navy
    Inventors: Meredith N. Hutchinson, Nicholas Frigo, Vincent J. Urick
  • Patent number: 9733381
    Abstract: In some embodiments, an apparatus and a system, as well as a method and an article, may operate to acquire a monitoring output from a first distributed feedback (DFB) fiber laser sensor at least partially bonded to a piezoelectric portion of a downhole device, to demodulate the monitoring output to determine a frequency shift in a lasing frequency of the DFB fiber laser sensor, and to correlate the frequency shift to a measure of magnetic field strength to determine a strength of a downhole magnetic field. Additional apparatus, systems, and methods are disclosed.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: August 15, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Tasneem A. Mandviwala
  • Patent number: 9720055
    Abstract: A device includes a diamond assembly. The diamond assembly includes a diamond with a plurality of nitrogen vacancy centers and electrical components that emit electromagnetic waves. The device also includes a light source configured to emit light toward the diamond and a photo detector configured to detect light from the light source that traveled through the diamond. The device further includes an attenuator between the diamond assembly and the photo detector. The attenuator is configured to attenuate the electromagnetic waves emitted from the electrical components of the diamond assembly.
    Type: Grant
    Filed: November 15, 2016
    Date of Patent: August 1, 2017
    Assignee: Lockheed Martin Corporation
    Inventors: Joseph W. Hahn, Gregory S. Bruce, Duc Huynh, Wilbur Lew
  • Patent number: 9709638
    Abstract: An implant with magnetic field recognition, such as an implant that recognizes fields generated by a magnetic resonance imaging (MRI) device. The implant includes at least one voltage source, at least one control unit, at least one communication coil and an optical structure with a Faraday element. The optical structure includes at least one first and second polarization filters and at least one light detector.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: July 18, 2017
    Assignee: Biotronik SE & Co. KG
    Inventors: Holger Lippitz, Ingo Weiss
  • Patent number: 9702900
    Abstract: A method for performing sub-nanometer three-dimensional magnetic resonance imaging of a sample under ambient conditions using a diamond having at least one shallowly planted nitrogen-vacancy (NV) center. A driving radio-frequency (RF) signal and a microwave signal are applied to provide independent control of the NV spin and the target dark spins. A magnetic-field gradient is applied to the sample with a scanning magnetic tip to provide a narrow spatial volume in which the target dark electronic spins are on resonance with the driving RF field. The sample is controllably scanned by moving the magnetic tip to systematically bring non-resonant target dark spins into resonance with RF signal. The dark spins are measured and mapped by detecting magnetic resonance of said nitrogen-vacancy center at each of said different magnetic tip positions. The dark-spin point-spread-function for imaging the dark spins is directly measured by the NV center.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: July 11, 2017
    Assignees: President and Fellows of Harvard College, University College London
    Inventors: Amir Yacoby, Michael Grinolds, Marc Warner, Kristiaan De Greve, Yuliya Dovzhenko
  • Patent number: 9660315
    Abstract: A distributed electromagnetic (EM) wave filter includes: a cavity; upper and lower ground planes on top and bottom surfaces of the cavity, wherein the upper and lower ground planes are in electrical contact; a plurality of electromagnetically coupled resonators in said cavity between the upper and lower ground planes that define respective transmission lines, wherein the plurality of resonators are not connected to each other by a conductive connection; an input port coupled to a first one of the plurality of resonators to receive an EM wave; an output port coupled to a last one of the plurality of resonators to output a filtered EM wave; and a plurality of conductive structures between adjacent resonators, respectively and connected to one or more of the upper and lower ground planes.
    Type: Grant
    Filed: June 10, 2015
    Date of Patent: May 23, 2017
    Assignee: RAYTHEON COMPANY
    Inventors: Jeremy B. Baldwin, Kevin W. Patrick
  • Patent number: 9658301
    Abstract: Absorption based detection of spin states of spin impurities within a solid-state spin system, such as NV centers in diamond, is implemented by measuring the absorption intensity of an optical signal applied to the spin impurities, i.e. change in intensity of the optical signal after the signal has been transmitted through the solid-state spin system. During optical excitation of the spin impurities, microwave pulses are applied to the sample at a frequency tuned to the ESR frequency. The relative populations of the spin states of the impurities, which provides information regarding variables of interest such as an external magnetic field or a quantum information protocol, is determined from the ratio of the absorption intensity of the optical signal when the microwave pulses are turned on, to the absorption intensity of the optical signal when the microwave pulses turned off.
    Type: Grant
    Filed: June 12, 2012
    Date of Patent: May 23, 2017
    Assignee: President and Fellows of Harvard College
    Inventor: Ronald Walsworth
  • Patent number: 9568545
    Abstract: Systems and methods for precision optical imaging of electrical currents and temperature in integrated circuits are disclosed herein. In one aspect of the disclosed subject matter, a method for detecting a characteristic of an integrated circuit can include depositing at least one diamond structure, having at least one color center therein, onto a side of the integrated circuit.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: February 14, 2017
    Assignee: The Trustees of Columbia University in the City of New York
    Inventors: Dirk R. Englund, Matthew E. Trusheim
  • Patent number: 9557391
    Abstract: A system for magnetic detection may include a nitrogen vacancy (NV) diamond material, a radio frequency (RF) excitation source, an optical excitation source, an optical detector, a magnetic field generator, and a controller. The controller may control the excitation sources to apply a first pulse sequence. The controller may receive a first light detection signal due to the first pulse sequence, measure first and second values of the first light detection signal at first and second reference periods, and compute a first measurement. The controller may further control the excitation sources to apply a second pulse sequence, receive a second light detection signal due to the second pulse sequence, measure first and second values of the second light detection signal at first and second reference periods, and compute a second measurement. The first and second measurements may be based on high and low resonance frequencies of the NV diamond material.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: January 31, 2017
    Assignee: Lockheed Martin Corporation
    Inventors: Laird Nicholas Egan, David Nelson Coar, Jon C. Russo
  • Patent number: 9515670
    Abstract: An atomic cell includes: alkaline metallic atoms, a body portion and window portions forming an inner space in which alkaline metallic atoms are sealed, and a getter material disposed in the inner space. The getter material is an alloy including at least one of titanium, barium, tantalum, zirconium, aluminum, vanadium, indium, and calcium, or an Al—Zr—V—Fe based alloy.
    Type: Grant
    Filed: October 7, 2015
    Date of Patent: December 6, 2016
    Assignee: Seiko Epson Corporation
    Inventor: Naoki Ishihara
  • Patent number: 9494809
    Abstract: A high-resolution sensor of magnetic field sensor system and materials for use in such a system are described. The sensor systems measure a magnetic field using inorganic and/or organic magneto-optically active materials, e.g. polymer material and have an interferometer based on Faraday rotation. The polymer material is preferably in the form of a film. The polymer material has an optical property that is sensitive to the magnetic field, e g the Faraday rotation effect. The present invention also provides a sensor head structure comprising the above polymer material. The sensor head may be designed for use with an optical fiber or with mirrors In particular the present invention provides a fiber Sagnac interferometer to measure the rotation of polarized plane of light. The present invention provides a fiber or mirror based Sagnac interferometer with passive phase bias applied to magnetic field sensing.
    Type: Grant
    Filed: August 28, 2013
    Date of Patent: November 15, 2016
    Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, KATHOLIEKE UNIVERSITEIT LEUVEN
    Inventors: Hitoshi Yamada, Kazuhiro Shintani, Akinobu Fujii, Norio Sato, Thierry Verbiest, Andre Persoons, Pavel Polynkin, Nasser Peyghambarian
  • Patent number: 9482612
    Abstract: A crystal film with nitrogen vacancy centers is placed in close proximity to a photon emitter. Excitation illumination is produced to cause the nitrogen vacancy centers to produce photoluminescence. Illumination is produced by the photon emitter, which may be near field or far field and which quenches the photoluminescence intensity using an effect known as Stimulated Emission Depletion (STED). The quenching caused by the photon emitter is detected and analyzed to determine characteristics of the photon emitter. The analysis takes into account the characteristic dependence of the STED on the depletion light power, i.e. the photon source, and a spatial distribution of the light intensity. The analysis may be applied to spatially resolved measurements or an integral value of the photoluminescence quenching. The analysis may determine characteristics such as peak power, power scaling factor, and FWHM of the illumination profile of the photon emitter.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: November 1, 2016
    Assignee: Infinitum Solutions, Inc.
    Inventor: Juergen Heidmann
  • Patent number: 9459329
    Abstract: There is provided a system (100) for magnetic field detection, comprising a fiber optic interrogator (104) adapted to interrogate a first length of optical fiber (102) with interrogating radiation, detect radiation backscattered from said optical fiber and analyze said detected radiation to provide distributed sensing indicative of mechanical disturbances of said optical, wherein the optic fiber is mechanically coupled to a material whose dimensions vary dependent on applied magnetic field. Changes in dimensions of the optic fiber as can be detected by virtue of changes in back-scattering of light from said fiber using the principles of fiber optic distributed acoustic sensing.
    Type: Grant
    Filed: August 31, 2011
    Date of Patent: October 4, 2016
    Assignee: Optasense Holdings Limited
    Inventors: Magnus McEwen-King, David John Hill, Alastair Godfrey
  • Patent number: 9442152
    Abstract: A fault location system for a distribution network is disclosed. The fault location system includes at least one sensor and a fault location evaluation apparatus. The at least one sensor is located on the distribution network, for sensing current and dividing the distribution network into at least two regions. The fault location evaluation apparatus includes a fault region determination unit for determining which one of the at least two regions is a fault region where a fault occurs therein by calculating the sensed current from the at least one sensor.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: September 13, 2016
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Zhilin Wu, Ilia Voloh, Lihan He, Zhihan Xu
  • Patent number: 9416005
    Abstract: A solid state system comprising a host material and a quantum spin defect, wherein the quantum spin defect has a T2 at room temperature of about 300 ?s or more and wherein the host material comprises a layer of single crystal CVD diamond having a total nitrogen concentration of about 20 ppb or less, wherein the surface roughness, Rq of the single crystal diamond within an area defined by a circle of radius of about 5 ?m centered on the point on the surface nearest to where the quantum spin defect is formed is about 10 nm or less, methods for preparing solid state systems and the use of single crystal diamond having a total nitrogen concentration of about 20 ppb or less in spintronic applications are described.
    Type: Grant
    Filed: July 22, 2009
    Date of Patent: August 16, 2016
    Assignee: Element Six Technologies Limited
    Inventors: Geoffrey Alan Scarsbrook, Daniel James Twitchen, Matthew Lee Markham
  • Patent number: 9351651
    Abstract: A magnetic field measurement apparatus includes a probe beam irradiating unit that radiates a probe beam. A gas cell is arranged on an optical axis of the probe beam and shows a linear dichroism with respect to the probe beam between a first axis and a second axis. Another gas cell is arranged on the optical axis of the probe beam on the opposite side of the probe beam irradiating unit with respect to the gas cell, and shows a linear dichroism with respect to the probe beam between a third axis and a fourth axis, which are different from the first and the second axes. A measuring unit measures a difference between magnetic fields in the gas cells and on the basis of amounts of change of a plane of polarization of the probe beam that has passed through the gas cell and the gas cell.
    Type: Grant
    Filed: April 2, 2014
    Date of Patent: May 31, 2016
    Assignee: SEIKO EPSON CORPORATION
    Inventor: Kimio Nagasaka
  • Patent number: 9348000
    Abstract: A resistive electromagnet assembly comprises a pair of coils with a gap defined between the coils. The resistive electromagnet assembly is configured to generate a field having a magnetic flux density of at least about 4 Tesla and at a sweep rate to complete a hysteresis loop in less than about 1 minute. A support assembly is configured to support a sample of magnetic material within the gap. An optics module is configured to expose a test region of the magnetic material sample to an optical beam probe while the test region is subjected to the field and to receive a reflected beam from the test region. A processor is coupled to the optics module and configured to measure one or more properties of the magnetic material using the received reflected beam.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 24, 2016
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jason L. Pressesky, Ganping Ju
  • Patent number: 9304336
    Abstract: A magneto-optic surface includes a support; at least two moving elements; each of the moving elements including at least one anchoring point to the support and at least one moving part movable with respect to the support, the moving part including at least one magnetic part; the support and the moving elements being laid out in such a way that under the effect of an external magnetic field, at least one of the moving elements moves with respect to the support such that the optical properties of the magneto-optic surface are modified.
    Type: Grant
    Filed: October 14, 2013
    Date of Patent: April 5, 2016
    Assignees: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
    Inventors: Helene Joisten, Bernard Dieny, Philippe Sabon, Roberto Calemczuk
  • Patent number: 9245551
    Abstract: A sensor may be configured with a nanocrystal that has a nitrogen-vacancy. The nanocrystal can be positioned proximal a magnetic source, mount, and articulable stage. Various embodiments configure the articulable stage configured to align the nanocrystal and the magnetic source along a common axis to sense magnetic fields about the magnetic source with a sub-nanometer resolution.
    Type: Grant
    Filed: March 18, 2015
    Date of Patent: January 26, 2016
    Assignee: Seagate Technology LLC
    Inventors: Fadi El Hallak, Marcus B. Mooney
  • Patent number: 9188694
    Abstract: A method of measuring an electromagnetic field in a formation can include installing an electromagnetic sensor with improved sensitivity, the sensor including multiple optical waveguides and respective multiple materials, and in response to exposure to the electromagnetic field, the materials changing shape in opposite directions. A well system can include an optical electromagnetic sensor which measures an electromagnetic field in a formation, and wherein optical path lengths or phases in optical waveguides of the sensor change both positively and negatively in response to exposure to the electromagnetic field.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: November 17, 2015
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Mikko Jaaskelainen, Tasneem A. Mandviwala
  • Patent number: 9170129
    Abstract: A system for sensing the position of a movable object includes a polarization maintaining fiber configured to receive light from a light source; an optical system configured to rotate an angle of polarization of the light by a first predetermined angle; a low birefringence fiber connected to the optical system at a first end and having a mirror connected to a second end configured to reflect the light and rotate the angle of polarization at a second predetermined angle, the second end being configured to overlap a magnetic field of the a magnet attached to the object. The angle of polarization is rotated to a third predetermined angle proportional to at least one of the strength of the magnetic field and an amount of the overlap. The optical system is configured to decompose the third predetermined angle into a first component and a second component. A detector is configured to detect a differential between the first and second components indicative of the amount of the overlap.
    Type: Grant
    Filed: October 17, 2013
    Date of Patent: October 27, 2015
    Assignee: General Electric Company
    Inventors: Sachin Narahari Dekate, Glen Peter Kose, Aaron Jay Knobloch, Boon Kwee Lee, Sameer Dinkar Vartak, Seema Somani
  • Patent number: 9103863
    Abstract: Provided are a method and apparatus for measuring a location of a terminal using a magnetic field. For example, the apparatus may measure a location of a terminal using a magnetic field obtained by a magnetic field sensor and one or more sensor values obtained by a plurality of other sensors.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: August 11, 2015
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Eung Sun Kim, Do Hyung Park, Yong Kim
  • Publication number: 20150123653
    Abstract: A light divider includes a light guide having a first surface and a second surface that reflect light incident on the light guide, the light guide causing the light to propagate through a portion between the first surface and the second surface, light dividing films that are provided in the light guide and so characterized that the light dividing films not only reflect but also transmit the light, and a plurality of light extracting portions that are provided on the first surface and allow light fluxes that the light dividing films have transmitted to exit through the first surface.
    Type: Application
    Filed: November 4, 2014
    Publication date: May 7, 2015
    Inventor: Kimio NAGASAKA
  • Patent number: 9024397
    Abstract: A micro-fabricated atomic clock structure is thermally insulated so that the atomic clock structure can operate with very little power in an environment where the external temperature can drop to ?40° C., while at the same time maintaining the temperature required for the proper operation of the VCSEL and the gas within the vapor cell.
    Type: Grant
    Filed: January 7, 2012
    Date of Patent: May 5, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Peter J. Hopper, William French, Paul Mawson, Steven Hunt, Roozbeh Parsa, Martin Fallon, Ann Gabrys, Andrei Papou
  • Publication number: 20150115948
    Abstract: A beam that passes through a plurality of gas cells a number of times is led to a deflection meter from a light ejecting section, detection of a deflected surface angle is performed and a strength of a magnetic field is measured by a structure in which the plurality of the gas cells is arranged along a light beam between two reflection units or light concentrating units that have a light beam incidence section and a light beam ejecting section and are opposite to each other, and a laser beam that is incident from the light beam incidence section passes through the plurality of the gas cells and then is multiply reflected by both reflection units.
    Type: Application
    Filed: January 5, 2015
    Publication date: April 30, 2015
    Inventor: Kimio NAGASAKA
  • Patent number: 8957677
    Abstract: A beam that passes through a plurality of gas cells a number of times is led to a deflection meter from a light ejecting section, detection of a deflected surface angle is performed and a strength of a magnetic field is measured by a structure in which the plurality of the gas cells is arranged along a light beam between two reflection units or light concentrating units that have a light beam incidence section and a light beam ejecting section and are opposite to each other, and a laser beam that is incident from the light beam incidence section passes through the plurality of the gas cells and then is multiply reflected by both reflection units.
    Type: Grant
    Filed: October 28, 2010
    Date of Patent: February 17, 2015
    Assignee: Seiko Epson Corporation
    Inventor: Kimio Nagasaka
  • Patent number: 8947080
    Abstract: A magnetometer for sensing a magnetic field may include a solid state electronic spin system, and a detector. The solid state electronic spin system may contain one or more electronic spins that are disposed within a solid state lattice, for example NV centers in diamond. The electronic spins may be configured to receive optical excitation radiation and to align with the magnetic field in response thereto. The electronic spins may be further induced to precess about the magnetic field to be sensed, in response to an external control such as an RF field, the frequency of the spin precession being linearly related to the magnetic field by the Zeeman shift of the electronic spin energy levels. The detector may be configured to detect output optical radiation from the electronic spin, so as to determine the Zeeman shift and thus the magnetic field.
    Type: Grant
    Filed: December 3, 2008
    Date of Patent: February 3, 2015
    Assignee: President and Fellows of Harvard College
    Inventors: Mikhail Lukin, Ronald L. Walsworth
  • Patent number: 8941377
    Abstract: An optically pumped magnetometer and a magnetic sensing method acquire information as to strengths of magnetic fields in two different directions. A pump light having a circularly polarized component, first probe light having a liner polarized component and second probe light having a linearly polarized component are emitted to a cell containing a group of alkali metal atoms so as to form a crossing region A magnetic field applying unit applies a static magnetic field in a direction of the pump light incident on the crossing region during the emission of the pump light, the first probe light and the second probe light. And, information as to strengths of magnetic fields in two different directions perpendicular to the direction of the static magnetic field in the cell from the rotation angles of a polarization planes of the first and second probe lights during passage through the cell is calculated.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: January 27, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Natsuhiko Mizutani, Tetsuo Kobayashi