Patents Examined by Eric L Bolda
  • Patent number: 10386384
    Abstract: A method of extracting particles from a two-dimensional (2D) hologram recorded as part of a digital inline holography system includes reconstructing a three-dimensional (3D) optical field from the recorded 2D hologram. In addition, particles are extracted/segmented from the 3D optical field, wherein segmented particles are identified by particle location in three-dimensional space and a cross-sectional area of the segmented particle. Based on the identified particle location and cross-sectional area, extracted particles are removed from the 2D hologram to generate an updated 2D hologram. These steps are repeated iteratively until a threshold is met.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: August 20, 2019
    Assignee: REGENTS OF THE UNIVESITY OF MINNESOTA
    Inventors: Jiarong Hong, Mostafa Toloui
  • Patent number: 10386466
    Abstract: A distance calculating unit includes a first filter that receives a detection signal of reference pulsed light, a second filter that receives a detection signal of measuring pulsed light, an adder circuit that adds the outputs from the two filters together, an A/D converter that receives the output signal from the adder circuit, and a separated-signal calculating unit that analyzes the output from the A/D converter and that generates a first separated signal corresponding to a reference detection signal and a second separated signal corresponding to a measurement detection signal. The distance calculating unit further includes a conversion processing unit that converts the phase of at least one of the two separated signals into a phase of a predetermined frequency, and a distance calculating unit that calculates a distance to an object by using a phase difference between the two separated signals in the predetermined frequency.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: August 20, 2019
    Assignee: TOPCON CORPORATION
    Inventor: Yoshikatsu Tokuda
  • Patent number: 10386463
    Abstract: A system includes: a light source; a detector configured to spectrally resolve light across an operative wavelength range; a retroreflector module including a reflector and an optical filter integrated with the reflector, the reflector being configured to retroreflect at least some of incident light across the operative wavelength range; an optical filter configured to filter light across the operative wavelength range, the optical filter having an angular-dependent optical characteristic for light across the operative wavelength range; and an electronic processing module in communication with the detector.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: August 20, 2019
    Assignee: X Development LLC
    Inventors: Martin Friedrich Schubert, Michael Jason Grundmann
  • Patent number: 10381797
    Abstract: A flexible TOF processing block having power measurement circuitry comprising separate modules that can be modified using parameterizable registers, without complete reconstruction, allows development to continue while the overall design is optimized.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: August 13, 2019
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Martin F Ryba, Robert T Carlson, Steven G Santee, Forrest C Vatter
  • Patent number: 10371803
    Abstract: A distance calculating unit includes a first filter for a detection signal of reference pulsed light, a second filter for measuring pulsed light, an adder circuit that adds outputs from the two filters together, an A/D converter that receives output from the adder circuit, a separated-signal calculating unit that analyzes output from the A/D converter and that generates a first separated signal and a second separated signal, a conversion processing unit that converts the phase of at least one of the two separated signals into a phase of a predetermined frequency, and a distance calculating unit that calculates a distance to an object by using a phase difference between the two separated signals and a correction parameter, which is obtained by making the reference pulsed light pass through the first filter and the second filter at the same time and by calculating a phase difference between outputs from these filters.
    Type: Grant
    Filed: March 8, 2017
    Date of Patent: August 6, 2019
    Assignee: TOPCON CORPORATION
    Inventor: Yoshikatsu Tokuda
  • Patent number: 10374379
    Abstract: A fiber amplifier includes an isolator, a gain fiber to amplify an input laser signal, and an optical filter disposed between the isolator and the gain fiber. The optical filter transmits the laser signal and reflects amplified spontaneous emission (ASE) propagating from the gain fiber toward the isolator. The reflected ASE reenters the gain fiber and is absorbed by the gain fiber for amplifying the input laser signal. The optical filter in the amplifier can protect the usually expensive isolator and reduce potential damage to the gain fiber induced by fluctuation of the input laser signal power, as well as reduce potential photodarkening at the input of the gain fiber.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: August 6, 2019
    Assignee: Massachusetts Institute of Technology
    Inventor: Steven J. Augst
  • Patent number: 10365093
    Abstract: The invention relates to a system and to a method for determining the displacement of two bodies relative to each other, wherein the system comprises a first camera, a second camera, a first lamp, and a second lamp, wherein both the first camera and the second camera comprise an objective and an image sensor having a sensor surface.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: July 30, 2019
    Assignee: Prüftechnik Dieter Busch AG
    Inventor: Heinrich Lysen
  • Patent number: 10353144
    Abstract: Embodiments of optical fiber may include cladding features that include a material (e.g., fluorine-doped silica glass) that may produce a very low relative refractive index difference with respect to cladding material in which the cladding features are disposed. This relative refractive index difference may be characterized by (n1?n2)/n1, where n1 is the index of refraction of the cladding material in which the cladding features are included, and n2 is the index of refraction of the cladding features. In certain embodiments, the relative refractive index difference may be less than about 4.5×10?3. In various embodiments, the configuration of the cladding features including, for example, the size and spacing of the cladding features, can be selected to provide for confinement of the fundamental mode yet leakage for the second mode and higher modes, which may provide mode filtering, single mode propagation, and/or low bend loss.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: July 16, 2019
    Assignee: IMRA America, Inc.
    Inventors: Liang Dong, Jun Li, Hugh McKay, Libin Fu, Andrius Marcinkevicius
  • Patent number: 10348051
    Abstract: In one embodiment, a fiber-optic amplifier includes an optical gain fiber configured to amplify input light received from a seed laser. The optical gain fiber includes a first gain section configured to: receive the seed-laser input light and co-propagating pump light; and amplify the seed-laser input light as it propagates along the first gain section. The seed-laser input light and the co-propagating pump light propagate along the first gain section in a same direction. The optical gain fiber also includes a second gain section configured to: receive the amplified input light from the first gain section; receive counter-propagating pump light; and further amplify the amplified input light as it propagates along the second gain section. The amplified input light and the counter-propagating pump light propagate along the second gain section in opposite directions. The fiber-optic amplifier also includes a first pump laser diode and a second pump laser diode.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: July 9, 2019
    Assignee: Luminar Technologies, Inc.
    Inventors: Lawrence Shah, Alain Villeneuve, Cheng Zhu, Laurance S. Lingvay
  • Patent number: 10338186
    Abstract: Optical positional tracking systems that may be used in virtual reality (VR)/augmented reality (AR) applications are described. Exemplary implementations comprise one or more receivers and one or more transmitters. Exemplary transmitters contains two orthogonal rotors that each emit a fan-shaped laser beam. Each beam is swept as the rotors are spun at constant speed. Exemplary optical receivers can be relatively small, and mounted at convenient locations on the VR display. These receivers consist of small optical detectors that may be mounted on head-mounted VR displays. Exemplary systems determine position by measuring the time at which each swept beam crosses each receiver/detector.
    Type: Grant
    Filed: November 10, 2015
    Date of Patent: July 2, 2019
    Assignee: Valve Corporation
    Inventors: Alan Yates, Jeremy Selan
  • Patent number: 10330922
    Abstract: In a biaxial optical deflector, multiple mirror units are arranged in an array. Each of the mirror units includes one mirror and one mirror driver coupled to said mirror for rocking the mirror.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: June 25, 2019
    Assignee: STANLEY ELECTRIC CO., LTD.
    Inventor: Yoshiaki Yasuda
  • Patent number: 10330778
    Abstract: We disclose a lidar system that includes a modulator-based probe-light generator and a coherent optical receiver. The probe-light generator uses tunable carrier-suppressed single-sideband modulation to generate frequency-chirped optical pulses for the optical-probe beam directed at the target. The coherent optical receiver uses a homodyne detection scheme in which a split portion of the optical-probe beam is used as an optical local oscillator signal for detecting a corresponding optical beam reflected by the target. The resulting electrical RF signals generated by the receiver can be processed, e.g., using a disclosed signal-processing method, to determine one or both of the distance to the target and the velocity of the target.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: June 25, 2019
    Assignee: NOKIA OF AMERICA CORPORATION
    Inventor: Noriaki Kaneda
  • Patent number: 10310288
    Abstract: In systems and methods for adjusting the position of a headset element (e.g., a display and/or other optical element), coherent light (e.g., a laser beam) is transmitted through a display of a headset to produce a diffraction pattern on a detector, which detects the diffraction pattern. The orientation of the headset element is determined based in part on the detected diffraction pattern. Based on the determined orientation and a target orientation, an adjustment to the orientation of the headset element is determined. The position of the headset element is adjusted based on the determined adjustment. This method may be repeated until the headset element is determined to be correctly oriented.
    Type: Grant
    Filed: September 28, 2016
    Date of Patent: June 4, 2019
    Assignee: Facebook Technologies, LLC
    Inventors: Samuel Redmond D'Amico, Evan M. Richards
  • Patent number: 10302746
    Abstract: Mounting a LIDAR above or external to a vehicle can enhance the LIDAR field of view but can conflict with vehicle aesthetics and ergonomics. Within embodiments, vehicle-integrated systems for distributing laser beams around a vehicle to increase coverage with a low-profile laser range finder are disclosed. A LIDAR can be embedded beneath a roof or body panel of a vehicle as part of a laser distribution system including a set of reflectors and lenses operable to adapt the LIDAR field of view to the vehicle shape. The set of embedded reflectors can guide laser beams parallel (e.g. within the roof structure), to and from the set of lenses at the roof edge to transmit the guided laser into regions of the surrounding beyond the direct field of view of the LIDAR. In other embodiments a beam guide (e.g. including a headlight assembly) can enable a LIDAR to perform ranging from behind a vehicle body panel.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: May 28, 2019
    Inventor: James Thomas O'Keeffe
  • Patent number: 10297968
    Abstract: A system includes a master oscillator configured to generate a low-power optical beam. The system also includes a planar waveguide (PWG) amplifier configured to receive the low-power optical beam and generate a high-power optical beam having a power of at least about ten kilowatts. The PWG amplifier includes a single laser gain medium configured to generate the high-power optical beam. The single laser gain medium can reside within a single amplifier beamline of the system. The master oscillator and the PWG amplifier can be coupled to an optical bench assembly, and the optical bench assembly can include optics configured to route the low-power optical beam to the PWG amplifier and to route the high-power optical beam from the PWG amplifier. The PWG amplifier could include a cartridge that contains the single laser gain medium and a pumphead housing that retains the cartridge.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: May 21, 2019
    Assignee: Raytheon Company
    Inventors: David M. Filgas, Stephen H. McGanty
  • Patent number: 10297970
    Abstract: A multi-stage optical amplifier has an input port for receiving an optical signal and a relatively short erbium doped optical fiber is coupled to the input port. Complex costly pump feedback is not required as a constant non-varying saturation pump is configured to provide non varying output power pump light of a predetermined wavelength suitable for excitation and full saturation of the erbium ions such that a full population inversion occurs. The length of the short erbium doped fiber and rare earth doping concentration of the erbium doped fiber is such that when pumped by said pump provides amplification of the optical signal of less than 15 dB. Locating a gain flattening filter after the short erbium doped optical fiber provides a relatively flat amplified output signal. Multi-stages of similar short erbium doped fibers pumped and saturated by the same pump signal economically provide increased amplification of the signal and filters after each state flatten the gain.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: May 21, 2019
    Inventor: Lijie Qiao
  • Patent number: 10297972
    Abstract: An erbium doped block of glass has input port and reflective end faces arranged such that a signal is launched into the block and is amplified as it traverses the block following a zig-zag path. A laser diode pump is focused to excite erbium ions within the block thereby amplifying the input signal light traversing the block numerous times. A gain flattening filter flattens the gain of the signal being amplified numerous times as the filter is within the path upon each pass across the block.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: May 21, 2019
    Inventor: Lijie Qiao
  • Patent number: 10297971
    Abstract: A multi-stage optical amplifier has an input port for receiving an optical signal and a relatively short erbium doped optical fiber is coupled to the input port. Complex costly pump feedback is not required as a constant non-varying saturation pump is configured to provide non varying output power pump light of a predetermined wavelength suitable for excitation and full saturation of the erbium ions such that a full population inversion occurs. The length of the short erbium doped fiber and rare earth doping concentration of the erbium doped fiber is such that when pumped by said pump provides amplification of the optical signal of less than 15 dB. Locating a gain flattening filter after the short erbium doped optical fiber provides a relatively flat amplified output signal. Multi-stages of similar short erbium doped fibers pumped and saturated by the same pump signal economically provide increased amplification of the signal and filters after each state flatten the gain.
    Type: Grant
    Filed: April 7, 2017
    Date of Patent: May 21, 2019
    Inventor: Lijie Qiao
  • Patent number: 10297981
    Abstract: The disclosed embodiments relate to the design of a hybrid laser comprising a shared ring mirror coupled to a pair of buses by a 3 dB coupler (also referred to as a “symmetric splitter”), which is described in more detail below. Each bus is also coupled to an array of ring filters, wherein each ring filter couples an associated reflective silicon optical amplifier (RSOA) to the shared ring mirror and in doing so forms a Verniered ring pair with the shared ring mirror. The resulting system provides a comb source with redundant channels that can provide individual outputs or a shared output. This hybrid laser provides a significant improvement over existing comb-based lasers by providing redundancy for at least one laser channel.
    Type: Grant
    Filed: October 13, 2016
    Date of Patent: May 21, 2019
    Assignee: Oracle International Corporation
    Inventors: Jock T. Bovington, Xuezhe Zheng, Ashok V. Krishnamoorthy
  • Patent number: 10288423
    Abstract: A measuring apparatus, for measuring the distance to a surface having fluctuating reflectivity, the measuring apparatus comprising, a measuring light source and sensor unit positioned at an angle to the perpendicular of the surface to allow the light to be reflected to a diffuse target surface in a known position; and a processor unit, wherein the processor unit is adapted to collect and analyze data from the a measuring light source and sensor unit and classify whether the reading of the measuring light source and sensor unit is a direct reading or a reflected reading.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: May 14, 2019
    Assignee: HATCH LTD.
    Inventor: Owen Pearcey