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公开(公告)号：US20230417532A1
公开(公告)日：2023-12-28
申请号：US18037655
申请日：2021-10-22
发明人： Guohua SUN , Xiaoliang GAO , Lei XU
IPC分类号： G01B9/02001 , G01B11/14 , G01B9/02055
CPC分类号： G01B9/02001 , G01B11/14 , G01B9/02077 , G01B2290/70
摘要： Interferometer displacement measurement system and method are disclosed, wherein, a measurement light is processed by a first polarization splitting prism, a first ¼ wave plate, a first splitting prism, an optical waveguide component and a reflector, and then is returned to a first photoeletric detector and a second photoeletric detector. The reference light is processed by a second polarization splitting prism, a second ¼ wave plate, a second splitting prism and a reflecting mirror, and then is returned to the first photoeletric detector and the second photoeletric detector. The first photoeletric detector forms a measurement signal according to the processed measurement light and the processed reference light, and the second photoeletric detector forms a reference signal according to the processed measurement light and the processed reference light. Displacement information of the object to be detected is determined according to the measurement signal and the reference signal.
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公开(公告)号：US20180242862A1
公开(公告)日：2018-08-30
申请号：US15870435
申请日：2018-01-12
发明人： Yali Jia , David Huang , Jason Tokayer , Ou Tan
CPC分类号： A61B5/0261 , A61B3/102 , A61B5/7203 , G01B9/02004 , G01B9/02045 , G01B9/02077 , G01B9/02087 , G01B9/02091
摘要： Amplitude decorrelation measurement is sensitive to transverse flow and immune to phase noise in comparison to Doppler and other phase-based approaches. However, the high axial resolution of OCT makes it very sensitive to the pulsatile bulk motion noise in the axial direction, resulting in unacceptable signal to noise ratio (SNR). To overcome this limitation, a novel OCT angiography technique based on the decorrelation of OCT signal amplitude due to flow was created. The full OCT spectrum can be split into several narrower spectral bands, resulting in the OCT resolution cell in each band being isotropic and less susceptible to axial motion noise. Inter-B-scan decorrelation can be determined using the narrower spectral bands separately and then averaged. Recombining the decorrelation images from the spectral bands yields angiograms that use the full information in the entire OCT spectral range. Such images showed significant improvement of SNR for both flow detection and connectivity of microvascular networks when compared to other amplitude-decorrelation techniques. Further, creation of isotropic resolution cells can be useful for quantifying flow having equal sensitivity to axial and transverse flow. Such improved non-invasive imagery can be useful in the diagnosis and management of a variety of diseases.
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公开(公告)号：US20180216927A1
公开(公告)日：2018-08-02
申请号：US15745771
申请日：2016-07-21
发明人： Aranchuk VYACHESLAV
CPC分类号： G01B9/02083 , G01B9/02003 , G01B9/02019 , G01B9/02027 , G01B9/02028 , G01B9/02045 , G01B9/02077 , G01B11/161 , G01B2290/65 , G01B2290/70 , G01H9/004 , G01M7/025
摘要： A sensor for a vibration imaging system is provided. The sensor includes a transmitter configured to project an array of laser beams onto a surface of an object such that neighboring beams in the array of laser beams are frequency shifted relative to each other, an interferometer configured to mix radiations reflected from neighboring points on the surface of the object such that the radiations from neighboring points interfere with one another, a photodetector array configured to produce output signals representative of the interfering beams, a demodulator configured to demodulate the output signals, and a computing device configured to calculate a deformation profile for the object based on the demodulated output signals.
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公开(公告)号：US09857160B1
公开(公告)日：2018-01-02
申请号：US14494878
申请日：2014-09-24
申请人： John M Hoffer, Jr.
发明人： John M Hoffer, Jr.
CPC分类号： G01B9/02077 , G01B9/02004 , G01B9/02028 , G01B9/0207 , G01B9/02075 , G01B9/02081 , G01B2290/25 , G01C3/08
摘要： A multi-mode frequency sweeping interferometer has a single measurement light producing device configured to produce a coherent light source consisting of a single light beam. The single measurement light producing device transitions the single light beam between a fixed light beam and a scanning wavelength light beam. A primary beam splitter produces a first reference beam and a first measurement beam from said single light beam. The first reference beam is configured to travel a fixed path length to a primary reference reflector and the first measurement beam is configured to travel to and from a moveable reflective target over an unknown path length. A first interferometer is created by interfering the first reference beam with the first measurement beam and one or more optoelectronic devices may be configured to determine a measured distance to the movable reflective target.
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公开(公告)号：US09857159B1
公开(公告)日：2018-01-02
申请号：US14494862
申请日：2014-09-24
申请人： John M Hoffer, Jr.
发明人： John M Hoffer, Jr.
CPC分类号： G01B9/02077 , G01B9/02004 , G01B9/02028 , G01B9/0207 , G01B9/02075 , G01B9/02081 , G01B2290/25 , G01C3/08
摘要： A velocity-compensated frequency sweeping interferometer has a single measurement light producing device that produces a coherent light source consisting of a single light beam. The light producing device produces a scanning wavelength light beam. A primary beam splitter produces a first reference beam and a first measurement beam from said single light beam. The first reference beam travels a fixed path length to a primary reference reflector and the first measurement beam travels to and from a moveable reflective target over an unknown path length. A distance measurement interferometer is created by interfering the first reference beam with the first measurement beam. A return frequency measurement interferometer provides a measure of frequency of the return beam from the target which, when compared with the frequency of the outgoing beam, allows for velocity compensation of the target.
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公开(公告)号：US20170343787A1
公开(公告)日：2017-11-30
申请号：US15680962
申请日：2017-08-18
申请人： Thorlabs, Inc.
发明人： Alex CABLE , Jörn Wollenzin , Ross Johnstone , Kirk Gossage , Jeffrey S. Brooker , Jason Mills , James Jiang , Dierck Hillmann
CPC分类号： G02B21/245 , G01B9/02059 , G01B9/02063 , G01B9/02077 , G01B9/0209 , G02B7/28 , G02B21/0004 , G02B21/26
摘要： Disclosed are several technical approaches of using low coherence interferometry techniques to create an autofocus apparatus for optical microscopy. These approaches allow automatic focusing on thin structures that are positioned closely to reflective surfaces and behind refractive material like a cover slip, and automated adjustment of focus position into the sample region without disturbance from reflection off adjacent surfaces. The measurement offset induced by refraction of material that covers the sample is compensated for. Proposed are techniques of an instrument that allows the automatic interchange of imaging objectives in a low coherence interferometry autofocus system, which is of major interest in combination with TDI (time delay integration) imaging, confocal and two-photon fluorescence microscopy.
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公开(公告)号：US20170258318A1
公开(公告)日：2017-09-14
申请号：US15456332
申请日：2017-03-10
申请人： Haag-Streit AG
发明人： Jörg WAGNER , Lucio ROBLEDO , Philippe CATTIN
CPC分类号： A61B3/0025 , A61B3/102 , A61B3/1025 , A61B3/113 , G01B9/02077 , G01B9/02091 , G01B2290/65
摘要： In a method for interferometrically capturing measurement points of a region of an eye, a plurality of measurement points are captured by a measurement beam along a trajectory, wherein the same trajectory is passed over by the measurement beam in the region during at least a first iteration and a second iteration. The trajectory of the first iteration is rotated through an angle and/or displaced by a distance in relation to the trajectory of the second iteration in order to obtain a more homogeneous measurement point distribution.
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公开(公告)号：US09706915B2
公开(公告)日：2017-07-18
申请号：US14861589
申请日：2015-09-22
CPC分类号： A61B3/102 , A61B3/0025 , A61B3/113 , A61B3/1233 , A61B5/0059 , A61B5/0066 , G01B9/02048 , G01B9/02077 , G01B9/02087 , G01B9/02091 , G01N21/4795 , G01N2021/1787
摘要： An image data set acquired by an optical coherence tomography (OCT) system is corrected for effects due to motion of the sample. A first set of A-scans is acquired within a time short enough to avoid any significant motion of the sample. A second more extensive set of A-scans is acquired over an overlapping region on the sample. Significant sample motion may occur during acquisition of the second set. A-scans from the first set are matched with A-scans from the second set, based on similarity between the longitudinal optical scattering profiles they contain. Such matched pairs of A-scans are likely to correspond to the same region in the sample. Comparison of the OCT scanner coordinates that produced each A-scan in a matching pair, in conjunction with any shift in the longitudinal scattering profiles between the pair of A-scans, reveals the displacement of the sample between acquisition of the first and second A-scans in the pair. Estimates of the sample displacement are used to correct the transverse and longitudinal coordinates of the A-scans in the second set, to form a motion-corrected OCT data set.
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公开(公告)号：US09603518B2
公开(公告)日：2017-03-28
申请号：US14831850
申请日：2015-08-20
发明人： Kuo-Jen Wang , Chun-Nan Lin
CPC分类号： A61B3/102 , A61B3/0025 , A61B3/1005 , A61B3/152 , G01B9/0207 , G01B9/02077 , G01B9/02091 , G02B26/105
摘要： An optical measuring device is provided. An actuator of a reference mirror set drives a reference mirror to move back and forth at a scan velocity. A first light source module transmits a first light beam to an optical coupling module transmitting two parts of the first light beam respectively to an examinee object and the reference mirror set. The first light beam then is reflected by the examinee object and reference mirror set and then transmitted to the optical coupling module and the processing unit. The second light source module transmits a second light beam to the examinee object. Then the second light beam is reflected and then transmitted to the second sensing unit. The second sensing unit provides a sensing signal to the processing unit which accordingly provides a value of the relative velocity. The thickness is calculated according to the relative velocity and the scan velocity.
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公开(公告)号：US20160143589A1
公开(公告)日：2016-05-26
申请号：US14922950
申请日：2015-10-26
CPC分类号： A61B5/702 , A61B5/0059 , A61B5/0064 , A61B5/0073 , A61B5/6825 , A61B2017/00557 , A61B2562/168 , G01B9/02049 , G01B9/02077 , G01B9/0209 , G01B11/14
摘要： A biological measurement device includes a phase modulation type interferometer, a first stage, a light transmitting plate, and a second stage. The first stage is able to retain a target which is a biological body. The light transmitting plate is disposed between the first stage and the interferometer in a direction of an optical axis of measurement light of the interferometer. The second stage supports the light transmitting plate. The first stage is configured to expand by a pressure of a gaseous body in the direction of the optical axis of the measurement light of the interferometer and to press the target against the light transmitting plate.
摘要翻译： 生物测量装置包括相位调制型干涉仪，第一级，透光板和第二级。 第一阶段能够保留作为生物体的目标。 透光板在干涉仪的测量光的光轴的方向上设置在第一和干涉仪之间。 第二级支持透光板。 第一阶段被配置为通过气体的压力在干涉仪的测量光的光轴的方向上膨胀并将目标压靠在透光板上。
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