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1
US10168139B2
Publication/Patent Number: US10168139B2
Publication date: 2019-01-01
Application number: 15/182,969
Filing date: 2016-06-15
Inventor: Yablon, Andrew D.  
Abstract: Briefly, embodiments of methods and/or systems for tomographic imaging are disclosed. In an example embodiment, optical measurements may be obtained for at least a portion of an illuminated object at a plurality of focal positions between the illuminated object and an imaging lens and at a plurality of angular orientations. Rotated representations of the optical measurements may be projected onto a coordinate plane in which in-focus and out-of-focus rotated representations of the optical measurements may form a cross-sectional image of the illuminated portion of the object. Briefly, embodiments of methods and/or systems for tomographic imaging are disclosed. In an example embodiment, optical measurements may be obtained for at least a portion of an illuminated object at a plurality of focal positions between the illuminated object and an imaging ...more ...less
2
US10175046B1
Publication/Patent Number: US10175046B1
Publication date: 2019-01-08
Application number: 15/990,761
Filing date: 2018-05-28
Inventor: Biren, Marvin A.  
Abstract: Methods and apparatus optically measure acceleration, without Sagnac-effect corruption, without requiring slow light and without moving parts. Each optical accelerometer includes at least one measurement cell and at least one reference cell. Two optical signals traverse the cells in opposite directions around a figure-8-configured optical path and then interfere to produce an output signal. The reference cells have different indices of refraction than the measurement cells. Acceleration differentially affects speeds of the optical signals traversing the measurement and reference cells through differentially affecting the indices of refraction of the measurement and reference cells. These differences are evident in changes in the interference in the output signal, thereby enabling measurement of the acceleration. Several embodiments, including optical bench, vertical slab multi-pass, toroidal prism, planar waveguide, cylindrical waveguide, wound waveguide and optical fiber, are described. Methods and apparatus optically measure acceleration, without Sagnac-effect corruption, without requiring slow light and without moving parts. Each optical accelerometer includes at least one measurement cell and at least one reference cell. Two optical signals traverse the ...more ...less
3
US10180315B2
Publication/Patent Number: US10180315B2
Publication date: 2019-01-15
Application number: 15/511,852
Filing date: 2015-09-17
Inventor: Hong, Jong Kyu  
Abstract: The present disclosure relates to a three-dimensional shape measurement apparatus for obtaining height information of a measurement target object using a prism. The three-dimensional shape measurement apparatus includes an illumination unit irradiating light on the measurement target object, a prism unit receiving reflective light reflected from the measurement target object and directing the reflective light to an image formation lens, an imaging unit receiving the reflective light from the prism unit and capturing an image of the reflective light, and a height measurement unit measuring a height of the measurement target object based on the image captured by the imaging unit. The present disclosure relates to a three-dimensional shape measurement apparatus for obtaining height information of a measurement target object using a prism. The three-dimensional shape measurement apparatus includes an illumination unit irradiating light on the measurement ...more ...less
4
US10188286B2
Publication/Patent Number: US10188286B2
Publication date: 2019-01-29
Application number: 15/553,681
Filing date: 2016-02-26
Abstract: The tomographic image capturing device of the present invention includes a tomographic image capturing means that scans measurement light on a subject's eye fundus (E) to capture tomographic images of the subject's eye fundus and an image processing means that compresses a picture of the captured tomographic images in a scan direction to generate a new tomographic picture. The tomographic image capturing means performs scan at a second scan pitch (PL) narrower than a first scan pitch (PH) to capture the tomographic images of the subject's eye fundus. The image processing means compresses the picture (B11) of the tomographic images captured at the second scan pitch (PL) in the scan direction to generate the new tomographic picture (B12). The measurement width in the scan direction of the new tomographic picture (B12) is a width of a picture corresponding to a measurement width in the scan direction of a tomographic picture (Bn (n=1 to 10)) obtained by scan at the first scan pitch (PH). The tomographic image capturing device of the present invention includes a tomographic image capturing means that scans measurement light on a subject's eye fundus (E) to capture tomographic images of the subject's eye fundus and an image processing means that compresses a ...more ...less
5
US10190977B2
Publication/Patent Number: US10190977B2
Publication date: 2019-01-29
Application number: 15/585,495
Filing date: 2017-05-03
Abstract: A method of identifying the material and determining the physical thickness of each layer in a multilayer structure is disclosed. The method includes measuring the optical thickness of each of the layers of the multilayer object as a function of wavelength of a light source and calculating a normalized group index of refraction dispersion curve for each layer in the multilayer structure. The measured normalized group index of refraction dispersion curves for each of the layers is then compared to a reference data base of known materials and the material of each layer is identified. The physical thickness of each layer is then determined from the group index of refraction dispersion curve for the material in each layer and the measured optical thickness data. A method for determining the group index of refraction dispersion curve of a known material is also disclosed. A method of identifying the material and determining the physical thickness of each layer in a multilayer structure is disclosed. The method includes measuring the optical thickness of each of the layers of the multilayer object as a function of wavelength of a light source and ...more ...less
6
US10192095B2
Publication/Patent Number: US10192095B2
Publication date: 2019-01-29
Application number: 15/633,439
Filing date: 2017-06-26
Inventor: Hogan, Joshua Noel  
Abstract: The invention provides a system and method for rapid validation of identity from tissue using registered two dimensional and optical coherence tomography (OCT) scan images. The preferred embodiment provides, for a human fingerprint, validation that the surface fingerprint matches the primary fingerprint. An alternate embodiment provides validation of “aliveness” by ascertaining blood flow. Various embodiments are taught. The invention provides a system and method for rapid validation of identity from tissue using registered two dimensional and optical coherence tomography (OCT) scan images. The preferred embodiment provides, for a human fingerprint, validation that the surface fingerprint ...more ...less
7
US10285594B2
Publication/Patent Number: US10285594B2
Publication date: 2019-05-14
Application number: 15/699,005
Filing date: 2017-09-08
Inventor: Maeda, Takuya  
Abstract: An electric motor including a rotor including magnetic pole units and a stator including slots facing an outer peripheral surface of the rotor. Each of the magnetic pole units is bulged to an outside in a radial direction so that a waveform of a magnetic flux density generated from the rotor is a sine wave shape, and a concave part or convex part which is small enough to prevent changing of a waveform cycle of cogging torque determined by a least common multiple of the number of slots and the number of magnetic poles of the rotor, is formed at a central part in a circumferential direction of an outer peripheral surface in each of the magnetic pole units. An electric motor including a rotor including magnetic pole units and a stator including slots facing an outer peripheral surface of the rotor. Each of the magnetic pole units is bulged to an outside in a radial direction so that a waveform of a magnetic flux density generated ...more ...less
8
US10288522B2
Publication/Patent Number: US10288522B2
Publication date: 2019-05-14
Application number: 16/144,277
Filing date: 2018-09-27
Abstract: The system and methods are made to apply interferometry to ophthalmic applications. The system makes use of a low-coherence interferometer to obtain a plurality of measurements of a contacts lens. The system and methods characterizes the surface profile of both surfaces of a contact lens, a thickness profiles, and combines these measurements with an index information to reconstruct a complete model of the contact lens. The system and methods are made to apply interferometry to ophthalmic applications. The system makes use of a low-coherence interferometer to obtain a plurality of measurements of a contacts lens. The system and methods characterizes the surface profile of both surfaces of a ...more ...less
9
US10309836B2
Publication/Patent Number: US10309836B2
Publication date: 2019-06-04
Application number: 15/331,036
Filing date: 2016-10-21
Abstract: A collimation evaluation device includes a first reflection member, a second reflection member, a screen, and a housing. A first reflection surface of the first reflection member and a first reflection surface of the second reflection member face each other and are parallel to each other. Further, interference fringes are formed on the screen by light L12 reflected on the first reflection surface of the first reflection member and a second reflection surface of the second reflection member and light L21 reflected on a second reflection surface of the first reflection member and the first reflection surface of the second reflection member, and collimation of incident light is evaluated on the basis of a direction of the interference fringes. A collimation evaluation device includes a first reflection member, a second reflection member, a screen, and a housing. A first reflection surface of the first reflection member and a first reflection surface of the second reflection member face each other and are parallel to ...more ...less
10
US10302409B1
Publication/Patent Number: US10302409B1
Publication date: 2019-05-28
Application number: 15/789,892
Filing date: 2017-10-20
Abstract: An apparatus includes a number of photonic integrated circuit (PIC) imaging detector arrays, and multiple electronic integrated circuits (ICs) coupled to the PIC imaging detector arrays. Each PIC imaging detector array of includes a number of lenslets and a number of waveguides. At least some of the lenslets are coupled to multiple waveguides, and sets of two lenslets are configured to form interferometer channels. An apparatus includes a number of photonic integrated circuit (PIC) imaging detector arrays, and multiple electronic integrated circuits (ICs) coupled to the PIC imaging detector arrays. Each PIC imaging detector array of includes a number of lenslets and a number of waveguides ...more ...less
11
US10302411B2
Publication/Patent Number: US10302411B2
Publication date: 2019-05-28
Application number: 15/696,095
Filing date: 2017-09-05
Abstract: In order to measure the contrast of interference in an interference-based, closed-loop, phase-modulating optical sensor device, the gain of the feedback loop in a feedback controller is evaluated. This gain is found to be a measure for the contrast. The contrast evaluated in this way can e.g. be used for period-disambiguation when determining the measurand of the sensor device. The sensor device can e.g. be a high-voltage sensor or a current sensor. In order to measure the contrast of interference in an interference-based, closed-loop, phase-modulating optical sensor device, the gain of the feedback loop in a feedback controller is evaluated. This gain is found to be a measure for the contrast. The contrast evaluated in ...more ...less
12
US10325362B2
Publication/Patent Number: US10325362B2
Publication date: 2019-06-18
Application number: 15/832,854
Filing date: 2017-12-06
Abstract: At a first timing when a tightening machine temporarily tightens a bolt, a distance sensor acquires a first distance image. A distance sensor controller measures a first recess amount of the head of the bolt at the first timing by the first distance image. A manipulator controller is configured to change a relative posture of an image sensor relative to the head of the bolt in accordance with a rotation angle by which the bolt is rotated from the first timing to a second timing. The distance sensor acquires a second distance image at the second timing, and the distance sensor controller measures a second recess amount of the head of the bolt at the second timing by the second distance image, so as to measure an axial tension of the bolt by use of a difference between the first recess amount and the second recess amount. At a first timing when a tightening machine temporarily tightens a bolt, a distance sensor acquires a first distance image. A distance sensor controller measures a first recess amount of the head of the bolt at the first timing by the first distance image. A manipulator ...more ...less
13
US10274377B1
Publication/Patent Number: US10274377B1
Publication date: 2019-04-30
Application number: 15/782,327
Filing date: 2017-10-12
Abstract: A ladar device that has a linear frequency-modulated laser source that produces a primary beam. An optical shear generator spectrally shears the primary beam into no less than three sensing beams. An optical output delivers at least one of the sensing beams toward a target. The sensing beams reflect from the target to produce reflected beams. An optical receiver receives the reflected beams and produces reflected beam signals corresponding to characteristics of the reflected beams. A processor receives the reflected beam signals and produces a deviation matrix, without the use of a local oscillator. The deviation matrix is used to produce a reconstruction of the target, which is output on an electrical signal output. A ladar device that has a linear frequency-modulated laser source that produces a primary beam. An optical shear generator spectrally shears the primary beam into no less than three sensing beams. An optical output delivers at least one of the sensing beams toward a target. The ...more ...less
14
US10274432B1
Publication/Patent Number: US10274432B1
Publication date: 2019-04-30
Application number: 15/390,669
Filing date: 2016-12-26
Abstract: A guided mode resonance (GMR) sensor assembly and system are provided. The GMR sensor includes a waveguide structure configured for operation at or near one or more leaky modes, a receiver for input light from a source of light onto the waveguide structure to cause one or more leaky TE and TM resonant modes and a detector for changes in one or more of the phase, waveshape and/or magnitude of each of a TE resonance and a TM resonance to permit distinguishing between first and second physical states of said waveguide structure or its immediate environment. A guided mode resonance (GMR) sensor assembly and system are provided. The GMR sensor includes a waveguide structure configured for operation at or near one or more leaky modes, a receiver for input light from a source of light onto the waveguide structure to cause one or more ...more ...less
15
US10254105B2
Publication/Patent Number: US10254105B2
Publication date: 2019-04-09
Application number: 15/369,355
Filing date: 2016-12-05
Inventor: Kay, David B.  
Abstract: An interferometric measuring machine includes an exchangeable lens module system for an optical probe. The probe includes a lens body containing the optical apparatus of an interferometer and a lens module containing an objective lens along an object arm of the interferometer that can be exchanged with other lens modules for varying the measuring characteristics of the probe. The lens modules are adapted to accommodate objective lenses having different focal lengths while maintaining a desired optical path length of the object arm of the interferometer. An interferometric measuring machine includes an exchangeable lens module system for an optical probe. The probe includes a lens body containing the optical apparatus of an interferometer and a lens module containing an objective lens along an object arm of the interferometer ...more ...less