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181 US10605921B2
Full-spectrum covering ultra wideband all photonics-based radar system
Publication/Patent Number: US10605921B2 Publication Date: 2020-03-31 Application Number: 15/833,992 Filing Date: 2017-12-06 Inventor: Zou, Weiwen   Zhang, Hao   Zhang, Siteng   Chen, Jianping   Assignee: Shanghai Jiao Tong University   IPC: G01C3/08 Abstract: A full-spectrum covering ultra wideband full-photonics based radar system comprising a signal transmitter, a transceiver module, and a signal receiver. The signal transmitter comprises a mode-locked laser, a first dispersion module, a first optical coupler, a second optical coupler, a first optical filter, a second dispersion module, a second optical filter, a first adjustable time delay module, a third optical coupler, an optical amplifier, and a first photodetector; the transceiver module comprises a band selector, a first electrical amplifier array, a T/R component array, an antenna array, and a second electrical amplifier array; the signal receiver comprises a third optical filter, a second adjustable time delay module, an electro-optical modulator, a third dispersion module, a second photodetector, an analog-digital conversion module, and a signal processing module. The system has continuous tunability for center frequency, bandwidth, and time width of the wideband signal with high coherence and ranging accuracy.
182 US10598787B2
Method and apparatus for measuring time of flight
Publication/Patent Number: US10598787B2 Publication Date: 2020-03-24 Application Number: 15/343,427 Filing Date: 2016-11-04 Inventor: Mattioli, Della Rocca Francescopaolo   Dutton, Neale   Assignee: STMicroelectronics (Research & Development) Limited   IPC: G01C3/08 Abstract: SPADs detect photons of a return light pulse and output corresponding pulse signals. First and second counters, when enabled in response to phase measurement value, are configured to count the pulse signals. The phase measurement value is set for a subsequent iteration of the return light pulse in response to processing of first and second count values of the first and second counters, respectively, for a current iteration. If the first count value exceeds the second count value by more than a difference threshold limit, the phase measurement value is decremented for the subsequent iteration. Otherwise, the phase measurement value is incremented for the subsequent iteration. If the difference threshold limit is not satisfied, the phase measurement value may be maintained for the subsequent iteration, but one of the counters is preloaded for the subsequent iteration with a value equal to a magnitude of the difference between the count values.
183 US10571677B2
Multi-wavelength Risley prisms for laser bore-sighting
Publication/Patent Number: US10571677B2 Publication Date: 2020-02-25 Application Number: 16/515,356 Filing Date: 2019-07-18 Inventor: Maryfield, Tony   Roes, Michael   Dadkhah, Mahyar   Assignee: Cubic Corporation   IPC: G01C3/08 Abstract: Techniques disclosed herein provide for substantially uniform steering of multiple laser beams of a laser rangefinder having different wavelengths, such as a rangefinder laser beam and a visible laser beam. This can allow a user of the laser rangefinder to use the visible laser beam to bore sight the range-finding laser beam to a weapon onto which the laser rangefinder is mounted. The uniform steering of the multiple laser beams can be done through the utilization of a Risley prism assembly with one or more Risley prisms having a center portion through which one laser beam travels and at least one annulus through which a second laser beam travels.
184 US10627495B2
Time varying gain in an optical detector operating in a lidar system
Publication/Patent Number: US10627495B2 Publication Date: 2020-04-21 Application Number: 16/185,427 Filing Date: 2018-11-09 Inventor: Gaalema, Stephen D.   Russell, Austin K.   Lachapelle, Joseph G.   Campbell, Scott R.   Eichenholz, Jason M.   Tran, Tue   Assignee: Luminar Technologies, Inc.   IPC: G01C3/08 Abstract: To decrease the likelihood of a false detection when detecting light from light pulses scattered by remote targets in a lidar system, a receiver in the lidar system includes a photodetector and a pulse-detection circuit having a gain circuit with a varying amount of gain over time. The gain circuit operates in a low-gain mode for a time period T1 beginning with time t0 when a light pulse is emitted to prevent the receiver from detecting return light pulses during the threshold time period T1. Upon expiration of the threshold time period T1, the gain circuit operates in a high-gain mode to begin detecting return light pulses until a subsequent light pulse is emitted.
185 US10670726B2
Distance measuring device and parallax calculation system
Publication/Patent Number: US10670726B2 Publication Date: 2020-06-02 Application Number: 15/116,399 Filing Date: 2015-02-24 Inventor: Suzuki, Shuichi   Nakajima, Mitsuru   Sekiguchi, Hiroyoshi   Guan, Haike   Yokota, Soichiro   Assignee: RICOH COMPANY, LTD.   IPC: G01C3/08 Abstract: A distance measuring device includes a plurality of image taking parts, a first distance information acquisition part that acquires distance information of an object for distance measuring from taken images that are taken by the plurality of image taking parts, an electromagnetic wave emission part that emits an electromagnetic wave, a reflected-wave receiving part that receives a reflected wave of an electromagnetic wave emitted from the electromagnetic wave emission part, and a second distance information acquisition part that acquires distance information of the object for distance measuring from a reflected wave received by the reflected-wave receiving part, wherein irradiation with an electromagnetic wave emitted from the electromagnetic wave emission part is executed under optical axes of the plurality of image taking parts.
186 US10663296B2
Surveying instrument
Publication/Patent Number: US10663296B2 Publication Date: 2020-05-26 Application Number: 15/878,830 Filing Date: 2018-01-24 Inventor: Sugiura, Akinobu   Ohishi, Masahiro   Assignee: TOPCON CORPORATION   IPC: G01C15/00 Abstract: Provided is a surveying instrument including a light emitting section for emitting distance measuring light having an intensity distribution in which an intensity is high at the center and it became lower as approaching the periphery, a light receiving section for receiving the distance measuring light via a measurement object; and a distance-measurement optical system for guiding the light to the light receiving section via the measurement object. The surveying instrument performs a prism-mode and non-prism-mode measurements. The optical system includes an aperture diaphragm arranged in a distance-measurement optical path during the prism-mode-measurement. An opening of the aperture diaphragm has widths of greater than 0 and not greater than 0.5 times the full width at half maximum of the intensity distribution in a cross-section of non-prism-distance-measurement beam in the horizontal and vertical direction.
187 US2020033449A1
Publication/Patent Number: US2020033449A1 Publication Date: 2020-01-30 Application Number: 16/592,459 Filing Date: 2019-10-03 Inventor: Schwarz, Brent   Haslim, James A.   Iturraran, Nicholas M.   Karasoff, Michael D.   Assignee: Uber Technologies, Inc.   IPC: G01S7/48 Abstract: A LIDAR sensor includes a fiber laser configured to emit an electromagnetic pulse through a fiber cable, and a fiber cable splitter to split the fiber cable into a first fiber cable and a second fiber cable. The electromagnetic pulse is split into an output pulse that propagates through the first fiber cable and a calibration pulse that propagates through the second fiber cable. The LIDAR sensor includes a pulse receiving sensor configured to detect the calibration pulse and a second pulse corresponding to the output pulse being reflected by a surface external from the LiDAR sensor. A processor is included to receive information from the pulse receiving sensor indicating a position of the surface relative to the LiDAR sensor. The processor further measures an intensity of the calibration pulse and determines a reflectance of the surface based at least in part on the intensity of the calibration pulse.
188 US2020300622A1
Publication/Patent Number: US2020300622A1 Publication Date: 2020-09-24 Application Number: 16/896,525 Filing Date: 2020-06-09 Inventor: Li, Tun   Pan, Siming   He, Dawei   Liu, Yi   Sun, Jingdong   Assignee: Sichuan Energy Internet Research Institute, Tsinghua University   IPC: G01C3/08 Abstract: An automated laser calibration kit for calibrating a distance between a testing device and a device-under-test (DUT) of a wireless charging system is disclosed. The calibration kit may be positioned on a wireless charging testing system. The testing system may comprise a testing plane to hold the DUT and a clamp arm to hold the testing device. The calibration kit may comprise a laser pointer configured to emit a laser beam; a reflection mirror positioned on the clamp arm and configured to reflect the laser beam to form a light point on the testing plane; and a camera configured to monitor a position of the light point.
189 US10795000B2
Laser distance and ranging (LADAR) apparatus, array, and method of assembling thereof
Publication/Patent Number: US10795000B2 Publication Date: 2020-10-06 Application Number: 14/796,518 Filing Date: 2015-07-10 Inventor: Singer, Scott   Moss, Robert Douglas   Assignee: The Boeing Company   IPC: G01C3/08 Abstract: A laser distance and ranging (LADAR) apparatus is provided. The LADAR apparatus includes a first substrate, a LADAR module coupled to the first substrate, and an actuation unit coupled between the first substrate and the LADAR module. The LADAR module is configured to scan with a predetermined field of view in a first viewing position from said LADAR module, and the actuation unit is selectively operable to modify an orientation of the LADAR module such that the predetermined field of view moves from the first viewing position towards a second viewing position from the LADAR module.
190 US10803725B2
Means and method for detecting the presence of at least one object to be tidied in a washroom
Publication/Patent Number: US10803725B2 Publication Date: 2020-10-13 Application Number: 15/835,783 Filing Date: 2017-12-08 Inventor: Gustafsson, Anders   Saarväli, Eva-li   Gabrielsson, Urban   Assignee: ESSITY HYGIENE AND HEALTH AKTIEBOLAG   IPC: G01C3/08 Abstract: A method and apparatus for determining presence of an object to be tidied in a washroom. A beam is supplied to a surface of the washroom at a first location. A reflected beam received from the surface of the washroom or received from an object in the path of the beam to the surface is detected. The presence of the object is determined from feedback from the beam based on a comparison of the feedback with a detection result when the beam reflects from the surface at the first location. An object to be tidied output signal is issued indicating that an object to be tidied is present based on the determination on the presence of an object.
191 US10768301B2
System and method for determining a distance to an object
Publication/Patent Number: US10768301B2 Publication Date: 2020-09-08 Application Number: 16/625,827 Filing Date: 2018-12-17 Inventor: Geuens, Filip   Van, Dyck Dirk   Paesen, Rik   Van, Den Bossche Johan   Assignee: XENOMATIX NV   IPC: G01C3/08 Abstract: A system for determining a distance to an object including a solid-state light source, a detector having a plurality of picture elements, and a processor to calculate the distance to the object as a function of exposure values generated by picture elements in response to the detected light. The picture elements generate exposure values by accumulating a first amount of electrical charge representative of reflected light during a first time window and a second electrical charge representative of reflected light during a second predetermined time window. The detecting occurs at the two charge storage wells; and the system interleaves the predetermined time windows with time windows during which the picture elements are used in a function different from the detecting and/or the picture elements include at least one further charge storage well to perform the function different from the detecting of the first and second amount of light.
192 US10731967B2
System for quickly detecting tunnel deformation
Publication/Patent Number: US10731967B2 Publication Date: 2020-08-04 Application Number: 15/787,259 Filing Date: 2017-10-18 Inventor: Yuan, Yong   Assignee: TONGJI UNIVERSITY   IPC: G01C3/08 Abstract: The present invention relates to a system for quickly detecting tunnel deformation, comprising a rail walking mechanism (1) disposed on a subway rail, and an acquisition system (2) disposed on the rail walking mechanism (1); wherein the rail walking mechanism (1) is a T-shaped walking platform, comprising a cross shaft (11), a longitudinal shaft (12) and a stand column (13); the cross shaft (11) and the longitudinal shaft (12) are connected to form the T-shaped platform; tread wheels (16) are disposed at the bottom of the T-shaped platform; one end of the stand column (13) is vertically connected with the cross shaft (11), and the other end of the stand column is used for configuring an operating platform (14) of the acquisition system (2); the acquisition system (2) comprises a fractional laser structured light source (21), industrial focus-fixed cameras (22) and a computer; and the computer is connected with the industrial focus-fixed cameras (22). Compared with the prior art, the quick detection device can effectively solve the problem of detecting cross section deformation of tunnels, the problem of transforming many different local coordinate systems to a global coordinate system, and the problem of unstable test data caused by movements.
193 US10724966B2
Sensor arrangement, measuring device and measuring method
Publication/Patent Number: US10724966B2 Publication Date: 2020-07-28 Application Number: 15/317,209 Filing Date: 2015-06-08 Inventor: Nyyssölä, Jari   Assignee: PKC Wiring Systems Oy   IPC: G01N21/00 Abstract: Measuring equipment for a crimp connection comprises a signal processing unit (150), a ranging sensor arrangement (100) based on using optical radiation, and a moving mechanism (102) that moves a formed crimp connection (104) and the ranging sensor arrangement (100) in relation to each other. The ranging sensor arrangement (100) measures the distance between the ranging sensor arrangement (100) and crimp connection (104) while the ranging sensor arrangement (100) and moving mechanism (102) are moved in relation to each other. The signal processing unit (150) generates surface profile data on the basis of the measured distances, uses the surface profile data of the crimp connection (104) to determine the quality of the crimp connection (104), and displays data related to the crimp connection (104).
194 US10578781B1
Switchable diffuser projection systems and methods
Publication/Patent Number: US10578781B1 Publication Date: 2020-03-03 Application Number: 16/259,812 Filing Date: 2019-01-28 Inventor: Zhu, Li   Lyu, Fanglu   Wang, Bo   Assignee: Shenzhen Guangjian Technology Co., Ltd.   IPC: G01C3/08 Abstract: A system including a light projecting system configured to project collimated beams of light; and a switchable diffuser. The switchable diffuser is coupled to a control source. The switchable diffuser changes from a first state to a second state responsive to the source being changed from a first condition to a second condition (e.g., changing a voltage condition from 0V to 1-50V). In the first state, the switchable diffuser receives collimated beams of light, diffuses them and projects a flood light. In the second state, the switchable diffuser is substantially transparent to the plurality of collimated beams of light, and permits the collimated beams of light to propagate through and out as an array. Systems may also include a detector configured to capture flood light and dot array reflections, and/or a ToF detector configured to measure time differences between different portions of returning light reflected off of a surface.
195 US10564262B2
Optical ranging system having multi-mode light emitter
Publication/Patent Number: US10564262B2 Publication Date: 2020-02-18 Application Number: 15/334,587 Filing Date: 2016-10-26 Inventor: Yang, Liu   Rudmann, Hartmut   Assignee: AMS SENSORS SINGAPORE PTE. LTD.   IPC: G01C3/08 Abstract: An optical ranging system includes a demodulation pixel array and a multi-mode light emitter. The multi-mode light emitter includes an illumination source and can generate a diffuse illumination and a discrete illumination in a first and second mode, respectively. Accordingly, in some implementations, the optical ranging system collects distance data via a time-of-flight technique and a structure-light technique. The illumination source can be operable to produce a diffuse illumination in a first mode and a discrete illumination in a second mode.
196 US10539666B2
Laser radar device
Publication/Patent Number: US10539666B2 Publication Date: 2020-01-21 Application Number: 15/526,659 Filing Date: 2015-08-31 Inventor: Ito, Yusuke   Imaki, Masaharu   Kameyama, Shumpei   Assignee: Mitsubishi Electric Corporation   IPC: G01C3/08 Abstract: A device includes a light source (1) for generating light with a single wavelength; a modulator (3) for modulating the light generated into transmission light; a beam scanner (7) for carrying out beam scanning by which the transmission light modulated is radiated, and the light reflected is received; a beam scanning controller (8) for controlling the radiation direction; a signal processing unit (12) for performing wind measurement through heterodyne detection using the light generated and the corresponding received light; and an optical axis corrector (9) for correcting the optical axis angular shift between the transmission light and the received light, which accompanies the beam scanning, with respect to the received light used by the signal processing unit (12) or the transmission light used by the beam scanner (7), on the basis of the radiation direction of the beam scanner (7), the angular speed of the beam scanning and the wind measurement distance.
197 US10649071B2
Scanning optical system and radar
Publication/Patent Number: US10649071B2 Publication Date: 2020-05-12 Application Number: 15/517,721 Filing Date: 2015-10-06 Inventor: Ishikawa, Ryouta   Kogo, Shoji   Assignee: Konica Minolta, Inc.   IPC: G01C3/08 Abstract: A scanning optical system, includes a mirror unit equipped with a first mirror surface and a second mirror surface each of which inclines to a rotation axis; and a light projecting system which includes at least one light source to emit a light flux toward the first mirror surface. A light flux emitted from the light source is reflected on the first mirror surface of the mirror unit, thereafter, reflected on the second mirror surface, and then, projected so as to scan in a main scanning direction onto an object in accordance with rotation of the mirror unit, and in a case where a direction included in a main scanning plane is set to 0 degree, the light flux reflected on the second mirror surface is polarized in a range within an angle of ±30 degrees to the main scanning plane.
198 US10690774B2
Pathway measurement devices, systems and methods
Publication/Patent Number: US10690774B2 Publication Date: 2020-06-23 Application Number: 16/111,921 Filing Date: 2018-08-24 Inventor: Pearlman, Jonathan L.   Sinagra, Eric Joseph   Duvall, Jonathan Aaron   Brown, Joshua D.   Stuckey, Dianna Rae   Chen, Tianyang   Mcintyre, Ian Patrick   Cooper, Rory Alan   Assignee: University of Pittsburgh—Of the Commonwealth System of Higher Education   The United States Government as represented by the Department of Veterans Affairs   IPC: G01C3/08 Abstract: A pathway measurement system hereof includes a rigid frame and a mobility system attached to the frame. The mobility system includes at least one movable element which is adapted to contact a surface of a pathway via which the frame may be moved relative to the pathway. The pathway measurement system further includes at least one sensor adapted to measure at least one characteristic of a pathway. The pathway measurement system has a first mode of operation in which the mobility system moves the frame along the pathway to move the at least one sensor relative to the pathway. The at least one sensor is connected to the pathway system such that a distance between the at least one sensor and an axis of rotation of one of the moveable elements remains constant in the first mode of operation. In general, the at least one sensor is isolated from any compliance or suspension system.
199 US10641896B2
Distance measurement device, distance measurement method, and distance measurement program
Publication/Patent Number: US10641896B2 Publication Date: 2020-05-05 Application Number: 15/921,658 Filing Date: 2018-03-15 Inventor: Sugimoto, Masahiko   Assignee: FUJIFILM CORPORATION   IPC: G01C3/08 Abstract: A distance measurement device includes a deriving unit that derives a dimension of a real-space region corresponding to an interval between a plurality of pixels associated with in-image irradiation positions derived as positions, which correspond to irradiation positions of laser beams onto a subject, within a captured image acquired by imaging the subject by an imaging unit, based on a distance measured by a measurement unit, an interval between a plurality of designated pixels, and a focal length of the imaging unit, and an output unit that derives derivation accuracy corresponding to an actually present factor based on a first correspondence relation between assumption factors assumed as factors influencing in-image irradiation positions and derivation accuracy derived by the deriving unit, and outputs information based on the derived derivation accuracy.
200 US2020174156A1
Publication/Patent Number: US2020174156A1 Publication Date: 2020-06-04 Application Number: 16/204,816 Filing Date: 2018-11-29 Inventor: Terefe, Nehemia   Assignee: Continental Automotive Systems, Inc.   IPC: G01V8/20 Abstract: A method and apparatus detects foreign material on a window of a LIDAR sensor and determines existence of a bad weather condition (fog, spray, rain). The LIDAR sensor has an illumination portion including a light source; a receiving portion having at least one photodetector for receiving light, sent from the light source, that is reflected from an object in a field of view of receiving optics; a blockage detection portion adjacent to the illumination portion; and a window portion extending from the illumination portion to the blockage detection portion. The method prevents light, from the light source that is scattered when foreign material is on a surface of the window or when a bad weather condition exists, to pass into the receiving portion and permits such scattered light to pass into the blockage detection portion. The scattered light is collected on a photodiode disposed in the blockage detection portion.