公开(公告)号：US4492464A

公开(公告)日：1985-01-08

申请号：US593927

申请日：1984-03-27

Applicant: Gilbert L. Bourdet ,  Michel A. Franco

Inventor： Gilbert L. Bourdet ,  Michel A. Franco

IPC: G01B9/02 ,  G01B11/14 ,  G01C3/00

CPC classification number: G01B9/02057 ,  G01B11/14 ,  G01B9/02004 ,  G01B9/02007 ,  G01B9/02048 ,  G01B9/02067 ,  G01B2290/25 ,  G01B2290/45 ,  G01B2290/70

Abstract: The apparatus and method include adjusting two single frequency lasers to separate longitudinal modes of an interferometer, the plates of which are separated by a distance to be measured. A rough estimate of the distance is made using a tape measure or the like. The rough estimate, together with the frequency distance (.DELTA.F) of the lasers adjusted to the longitudinal modes of the interferometer is used to solve the equation: ##EQU1## where c is the speed of light and L.sub.1 is the rough estimate. The parameter k then calculated by rounding k.sub.1 to the nearest integer and the accurate distance L is calculated according to the equation: ##EQU2##

Abstract translation: 该装置和方法包括调整两个单频激光器以分离干涉仪的纵向模式，其中的板被分离待测量的距离。 使用卷尺等进行距离的粗略估计。 使用粗略估计以及调整到干涉仪的纵向模式的激光器的频率距离（DELTA F）来求解以下等式：其中c是光速，L1是粗略估计。 然后通过将k1舍入到最接近的整数来计算参数k，并且根据以下等式计算精确距离L.

公开(公告)号：US3970389A

公开(公告)日：1976-07-20

申请号：US442463

申请日：1974-02-14

Applicant: Michael J. Mendrin ,  Richard H. Taylor

Inventor： Michael J. Mendrin ,  Richard H. Taylor

IPC: G01B9/02

CPC classification number: G01B9/02069 ,  G01B9/02004 ,  G01B9/02078 ,  G01B2290/25 ,  G01B2290/45 ,  G01B2290/60

Abstract: Distance measurement by conventional optical interferometry requires physical movement of an optical element. The present system obtains interference with a continuous range of radiation wavelengths, providing a direct measurement of a constant optical path difference, in terms of the fringe count and the end wavelengths of the range employed. Variations in the optical path difference occurring during the measurement are compensated by simultaneous interferometry with a fixed wavelength.

Abstract translation: 通过常规光学干涉测量的距离测量需要光学元件的物理移动。 本系统获得对连续范围的辐射波长的干扰，根据所使用范围的条纹计数和结束波长提供恒定光程差的直接测量。 在测量期间发生的光程差的变化通过固定波长的同时干涉测量来补偿。

公开(公告)号：US3891320A

公开(公告)日：1975-06-24

申请号：US41720473

申请日：1973-11-19

Applicant: KONISHIROKU PHOTO IND

Inventor： KIMURA YOSHIAKI ,  KAWAI MASANORI ,  YAJIMA TATSUO ,  MORISHITA TANEJI

IPC: G01M11/00 ,  G01B9/02 ,  G01B11/30 ,  G02B7/00

CPC classification number: G01B11/306 ,  G01B9/02022 ,  G01B2290/25

Abstract: A gauge for measuring flatness by utilizing the interference of light is composed of a block having a reference or standard surface of a high flatness and surfaces intersecting the reference surface. Three supporting members are fixedly secured to said surfaces in an appropriate arrangement. Each of three pins which is anchored to respective supporting member has a pointed top portion jut beyond the reference surface. The object or specimen to be tested is rested on said top portions of the three pins to support the specimen with the tested surface extending substantially in parallel with said reference surfaces in opposing position.

Abstract translation: 通过利用光的干涉来测量平坦度的量规由具有高平坦度的参考或标准表面和与参考表面相交的表面的块组成。 三个支撑构件以适当的布置牢固地固定到所述表面。 锚定到相应的支撑构件的三个销中的每一个具有超过参考表面的尖顶部突出部。 要测试的物体或试样被放置在三个销的所述顶部上，以支撑试样，试验表面在相对的位置基本平行于所述参考表面延伸。

公开(公告)号：US3582212A

公开(公告)日：1971-06-01

申请号：US3582212D

申请日：1968-08-27

Applicant: ZEISS JENA VEB CARL

Inventor： HESSE GERHARD ,  REIMANN WOLFGANG

IPC: G01B9/02

CPC classification number: G01B9/02 ,  G01B2290/25

Abstract: A Fabry-Perot resonator comprises two plates which are displaceable relatively to each other by means of concentric series of electrostrictive rods, the number of rods being the same in each series. The rods of the consecutive series are arranged along radii which enclose given angles. The consecutive rods are interconnected in meanderlike fashion. Two opposite surfaces of each rod bear electrically conductive linings, so that applied voltage produces an electric field between these linings. Differential influences on two radially consecutive rods produce changes in the distance apart of, or the angle between, the plates. Equality in the dimensions and thermal properties of the rods renders the resonator insensitive to thermal influence. Suitable coordination of the plate carriers relative to each other permits relatively great changes in the distances of the plates from each other and at the same time excludes thermal influence.

公开(公告)号：US3532430A

公开(公告)日：1970-10-06

申请号：US3532430D

申请日：1966-04-12

Applicant: PERKIN ELMER CORP

Inventor： VRABEL JOSEPH

IPC: G01B9/02

CPC classification number: G01B9/02057 ,  G01B9/02024 ,  G01B2290/25

公开(公告)号：US12025438B2

公开(公告)日：2024-07-02

申请号：US17919158

申请日：2021-08-24

Applicant: The Curators of the University of Missouri

Inventor： Genda Chen ,  Jie Gao ,  Chuanrui Guo

IPC: G01D5/353 ,  G01B9/02056

CPC classification number: G01B9/02058 ,  G01D5/353 ,  G01B2290/25

Abstract: A miniature, micrometer-accuracy, three-dimensional (3D) position-to-optical displacement sensor that has at least one extrinsic Fabry-Perot interferometer (EFPI) in Z direction and a series of plasmonic metasurface resonators with distinctive wavelength-selective characteristics in X and Y directions. The interferometer comprises at least one single mode optic fiber for light propagation, and a substrate mirror to create a light interference fringe as a function of distance between the mirror and the distal end of the optic fiber. Each plasmonic resonator is capable of modifying the substrate mirror and comprises an array of multiple unit nanostructure unit cells that are arranged in a two-dimensional (2D) square lattice or array in the X-Y plane. The nanostructure unit cells are preferably inscribed in the top layer of a three-layer thin film via the focused ion beam (FIB).

公开(公告)号：US20180051978A1

公开(公告)日：2018-02-22

申请号：US15785142

申请日：2017-10-16

Applicant: Axsun Technologies, Inc.

Inventor： Dale C. Flanders ,  Walid A. Atia ,  Bartley C. Johnson ,  Mark E. Kuznetsov ,  Carlos R. Melendez

IPC: G01B9/02 ,  H01S5/14 ,  H01S5/068 ,  H01S3/08 ,  H01S3/106 ,  H01S5/022 ,  H01S5/024

CPC classification number: G01B9/02091 ,  G01B9/02004 ,  G01B9/02044 ,  G01B9/02059 ,  G01B9/02069 ,  G01B2290/25 ,  H01S3/08013 ,  H01S3/08054 ,  H01S3/1067 ,  H01S5/02248 ,  H01S5/02415 ,  H01S5/068 ,  H01S5/141 ,  H01S5/146

Abstract: A frequency swept laser source for TEFD-OCT imaging includes an integrated clock subsystem on the optical bench with the laser source. The clock subsystem generates frequency clock signals as the optical signal is tuned over the scan band. Preferably the laser source further includes a cavity extender in its optical cavity between a tunable filter and gain medium to increase an optical distance between the tunable filter and the gain medium in order to control the location of laser intensity pattern noise. The laser also includes a fiber stub that allows for control over the cavity length while also controlling birefringence in the cavity.

公开(公告)号：US09829306B2

公开(公告)日：2017-11-28

申请号：US14284756

申请日：2014-05-22

Applicant: attocube Systems AG

Inventor： Klaus Thurner ,  Khaled Karrai ,  Pierre-Francois Braun

IPC: G01B9/02 ,  G01B11/00

CPC classification number: G01B9/02 ,  G01B9/02002 ,  G01B9/02003 ,  G01B9/02004 ,  G01B9/02007 ,  G01B11/00 ,  G01B2290/25

Abstract: A device for absolute distance measurement includes a first tunable light source for emitting a first wavelength light of a first tunable frequency modulated by a first modulating frequency and a second light source for emitting a second wavelength light of a second frequency modulated by a second modulating frequency. An optical coupler couples the first wavelength light and the second wavelength light into an interferometer cavity. An interferometer detector provides an interference measurement signal based on a detected interference pattern. A demodulator unit generates a first demodulation signal based on the interference measurement signal by demodulation with the first modulating frequency and a second demodulation signal based on the interference measurement signal by demodulation with the second modulating frequency. A computation unit computes an absolute distance by evaluating the first demodulation signal acquired during a sweep of the first tunable frequency and the second demodulation signal.

公开(公告)号：US09709745B2

公开(公告)日：2017-07-18

申请号：US14786821

申请日：2014-04-17

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xuewen Shu ,  Miguel Angel Preciado

IPC: G02B6/34 ,  G02B6/293 ,  G02B6/02 ,  G02B6/28 ,  C03B37/14 ,  G03F1/26

CPC classification number: G02B6/29353 ,  C03B37/14 ,  G01B2290/25 ,  G02B6/02085 ,  G02B6/02138 ,  G02B6/2861 ,  G02B6/29356 ,  G02B2006/02166 ,  G03F1/26

Abstract: A delay line interferometer comprising an optical waveguide having a distributed Bragg reflector, e.g. Bragg grating, fabricated therein. The distributed Bragg reflector has a refractive index modulation with a period variation Λ(z) along its length z that is arranged to output in transmission an output optical signal fout(t) in response to a input optical signal fin(t), wherein the output optical signal fout(t) is the result of temporal interference between one or more time-delayed replicas of the input optical signal fin(t). In other words, the distributed Bragg reflector is operable to generate and permit temporal interference between two or more time-delayed replicas of the input optical signal fin(t). The invention may thus mimic the behaviour of one or more MZIs.

公开(公告)号：US20170082422A1

公开(公告)日：2017-03-23

申请号：US15370767

申请日：2016-12-06

Applicant: BAKER HUGHES INCORPORATED

Inventor： CARL M. EDWARDS

IPC: G01B9/02 ,  E21B49/00 ,  E21B47/01

CPC classification number: G01B9/02067 ,  E21B47/011 ,  E21B49/00 ,  G01B9/02052 ,  G01B9/02075 ,  G01B2290/25 ,  G01D5/266 ,  G01D5/34 ,  G01V11/00

Abstract: Methods, systems and devices for estimating a parameter of interest in a borehole. The method may include generating information from an optical displacement device relating to relative motion between two or more reflective surfaces thereof that is indicative of the parameter of interest; and preventing changes in the information resulting from changes at the optical displacement device in at least one of i) temperature, or ii) pressure, by compensating for the changes. Compensating may include adjusting at least one light source generating an electromagnetic beam at least partly received by the optical displacement device responsive to information relating to a control optical displacement device at the optical displacement device. Compensating may include using an optical displacement device and configuring the optical displacement device such that a difference between a first variable gap and a second variable gap is substantially zero while the apparatus is subject to nominal conditions.