公开(公告)号：US5308973A

公开(公告)日：1994-05-03

申请号：US795725

申请日：1991-11-21

Applicant: Walter Odoni ,  Rene Dandliker ,  Hanspeter Schad ,  Edwin Schweizer

Inventor： Walter Odoni ,  Rene Dandliker ,  Hanspeter Schad ,  Edwin Schweizer

IPC: G01L1/24 ,  H01J5/16

CPC classification number: G01L1/243

Abstract: A method and the device for fiber-optic measurement of the absolute value of the pretensioning in a highly loaded mechanical structural component part are based on the measurement of the phase displacement of a light wave caused by the strain-induced birefringence in a single-mode light waveguide 4 which is embedded between two metallic disks or washers 3a, 3b. Since the measurement results are ambiguous modulo-2.pi., serial or simultaneous measurement with two light wavelengths .lambda..sub.1, .lambda..sub.2 is used according to a first method variant of the invention. The quantity of 2.pi. periods can be unequivocally determined within a predetermined measuring range by means of comparing the two measurement results. The evaluation is preferably effected according to a quadrature or phase step method, known per se. According to second method variant, the light waveguide 4 is irradiated with polarized white light. The phase difference of the two linear modes due to the influence of force on the structural component part is compensated for in a compensation device 20. The control signal required for the compensation of the path difference is evaluated as a measurement for the force. The compensation method has the advantage that no monochromatic light sources are required.

Abstract translation: 用于光纤测量的方法和用于在高负荷机械结构部件中的预张紧绝对值的装置基于由单模中的应变引起的双折射引起的光波的相位位移的测量 光波导4嵌入在两个金属盘或垫圈3a，3b之间。 由于测量结果是模2 pi，根据本发明的第一种方法变体使用具有两个光波长λ1，λ2的串联或同时测量。 通过比较两个测量结果，可以在预定的测量范围内明确地确定2个pi周期的数量。 评估优选根据本身已知的正交或相位步骤方法进行。 根据第二方法变型，用偏振白光照射光波导4。 在补偿装置20中补偿由于力对结构部件的影响的两个线性模式的相位差。补偿路径差所需的控制信号被评估为力的测量值。 补偿方法的优点是不需要单色光源。

公开(公告)号：US5026984A

公开(公告)日：1991-06-25

申请号：US465710

申请日：1990-01-16

Applicant: David W. Gerdt

Inventor： David W. Gerdt

IPC: G01D5/353 ,  G01F23/14 ,  G01F23/18 ,  G01F23/292 ,  G01K5/52 ,  G01L1/24 ,  G01L11/02

CPC classification number: G01F23/14 ,  G01D5/35345 ,  G01F23/18 ,  G01F23/292 ,  G01K5/52 ,  G01L1/243 ,  G01L11/025

Abstract: Temperature, pressure and liquid level parameters are sensed by the variable ratio fiber optic coupler sensor wherein the optical coupling ratio varies in accordance with stress applied to the coupler encapsulant resulting from application of the parameter being sensed. Such use of the coupler sensor is particularly advantageous in fuel tanks, which are subject to spark hazard. Vertical arrays of such sensors are utilized to determine levels of liquids in such fuel tanks. Various sensor configurations are disclosed.

公开(公告)号：US4911512A

公开(公告)日：1990-03-27

申请号：US117690

申请日：1987-11-05

Applicant: Osamu Yamamoto ,  Hiroshi Hayashi ,  Nobuyuki Miyauchi ,  Shigeki Maei ,  Hidenori Kawanishi

Inventor： Osamu Yamamoto ,  Hiroshi Hayashi ,  Nobuyuki Miyauchi ,  Shigeki Maei ,  Hidenori Kawanishi

IPC: H01L27/15 ,  G01L1/24 ,  G02B6/12 ,  G02B6/122 ,  G02F1/01 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135 ,  H01S5/00 ,  H01S5/022 ,  H01S5/0687 ,  H01S5/14 ,  H01S5/187

CPC classification number: H01S5/141 ,  G01L1/243 ,  G11B7/124 ,  G11B7/125 ,  H01L2224/45144 ,  H01L2224/48463 ,  H01S5/02248 ,  H01S5/02292 ,  H01S5/0687

Abstract: A waveguide type optical head comprises a thin film waveguide of semiconductor or dielectric substance formed on a semiconductor or dielectric substrate, an optical element with an optical signal processing function provided on the thin film waveguide, and a semiconductor laser fixed on the substrate for emitting laser beam into the waveguide, and is characterized in that part of the laser beam emitted from the semiconductor laser is reflected by the incident end surface of the thin film waveguide and returned to the semiconductor laser.

Abstract translation: 波导型光学头包括形成在半导体或电介质基板上的半导体或电介质的薄膜波导，在薄膜波导上提供的具有光信号处理功能的光学元件，以及固定在基板上用于发射激光的半导体激光器 并且其特征在于，从半导体激光器发射的激光束的一部分被薄膜波导的入射端面反射并返回到半导体激光器。

公开(公告)号：US4781056A

公开(公告)日：1988-11-01

申请号：US934614

申请日：1986-11-07

Applicant: Jacques Noel ,  Jean-Claude Bocquet

Inventor： Jacques Noel ,  Jean-Claude Bocquet

IPC: G01L5/00 ,  G01L1/24 ,  G01G3/12 ,  G01G9/00 ,  G01L25/00

CPC classification number: G01L1/245 ,  G01L1/243 ,  Y10S177/06

Abstract: An optical device and method for strain detection. The device is provided with at least one optical fiber arranged so as to form a network. A light emitting device is arranged at one end of the fiber and a receiver is arranged at the other end, enabling the generation of information relative to the light intensity transmitted by the fiber or fibers in the presence of strain, and a measurement corresponding to the strain.

Abstract translation: PCT No.PCT / FR86 / 00071 Sec。 371日期：1986年11月7日 102（e）日期1986年11月7日PCT公布1986年3月5日PCT公布。 公开号WO86 / 05273 日期：1986年9月12日。用于应变检测的光学装置和方法。 设备设置有至少一个布置成形成网络的光纤。 发光器件布置在光纤的一端并且另一端布置有接收器，使得能够在存在应变的情况下相对于由光纤或光纤传输的光强产生信息，并且对应于 应变。

公开(公告)号：US4758087A

公开(公告)日：1988-07-19

申请号：US36183

申请日：1987-04-09

Applicant: John W. Hicks, Jr.

Inventor： John W. Hicks, Jr.

IPC: G01D5/34 ,  G01L1/24 ,  G01B9/02

CPC classification number: G01L1/243 ,  G01D5/344

Abstract: An optical physical condition sensor includes an optical fiber resonant cavity into which optical energy, including wavelengths resonatable within the cavity, is introduced. External physical conditions, such as temperature or pressure, change the effective optical path length within the cavity to cause a corresponding change in the cavity's resonant characteristics. Changes in the sensed condition can be determined as a function of changes in the wavelength of optical energy peaks or minimas in the cavity or changes in the cavity's finesse characteristics.

Abstract translation: 光学物理状况传感器包括光纤谐振腔，其中引入了包括在空腔内可共振的波长的光能。 外部物理条件，例如温度或压力，改变空腔内的有效光程长度，引起腔谐振特性的相应变化。 可以将检测到的条件的变化确定为空腔中的光能峰值或最小值的波长的变化或空腔的精细特性的变化的函数。

公开(公告)号：US4740078A

公开(公告)日：1988-04-26

申请号：US690997

申请日：1985-01-14

Applicant: Rene Daendliker ,  Axel Bertholds

Inventor： Rene Daendliker ,  Axel Bertholds

IPC: G01L1/24

CPC classification number: G01L1/243

Abstract: The force measuring apparatus includes a single-mode optical fiber having a defined anisotropy, whereby coherent light suppled to one end of the optical fiber is guided as two waves having linear orthogonal polarizations, respectively. The optical fiber is arranged between a pair of parallel planar pressure plates, the orientation of the optical fiber being such that the aforementioned linear polarizations are parallel with and normal to the remote surfaces of the pressure plates, respectively. Upon the application of a force to be measured in the compressive direction normal to one remote surface of a plate, a phase shift is produced between the waves which is a function of the magnitude of the load to be measured, as determined by interferometer means arranged at the other end of the optical fiber. The optical fiber may be of a helical configuration having turns that are contained between successive pairs of pressure plates, respectively, arranged in a stack, thereby achieving a multiplication of the measuring effect with increased accuracy of the corresponding measurement.

Abstract translation: 力测量装置包括具有确定的各向异性的单模光纤，由此提供给光纤的一端的相干光分别被​​引导为具有线性正交偏振的两个波。 光纤布置在一对平行的平面压板之间，光纤的取向分别使得上述线性偏振与压板的远程表面平行并垂直于压板的远端表面。 当在垂直于板的一个远程表面的压缩方向施加要测量的力时，在波之间产生相移，该相对于待测量的负载的大小的函数，如通过布置的干涉仪装置 在光纤的另一端。 光纤可以具有螺旋形构造，其具有分别以堆叠布置的连续的压板对之间的匝，从而实现测量效果与相应测量的精度的增加。

公开(公告)号：US4688883A

公开(公告)日：1987-08-25

申请号：US736112

申请日：1985-05-20

Applicant: Franz A. Blaha

Inventor： Franz A. Blaha

IPC: G01D5/353 ,  G01L1/24 ,  G02B6/28 ,  G02B6/30 ,  G02B6/42

CPC classification number: G01D5/35303 ,  G01L1/243 ,  G02B6/2817 ,  G02B6/30

Abstract: An integrated flexible optical transducer element includes an elongate substrate having parallel surfaces. Optical waveguides are disposed on the surfaces. The surfaces are tapered at least at one end of the substrate.

Abstract translation: 集成的柔性光学换能器元件包括具有平行表面的细长衬底。 光波导设置在表面上。 表面至少在基底的一端渐缩。

公开(公告)号：US20230251150A1

公开(公告)日：2023-08-10

申请号：US18135337

申请日：2023-04-17

Applicant: Bard Access Systems, Inc.

Inventor： Anthony K. Misener ,  Steffan Sowards ,  Shayne Messerly ,  William Robert McLaughlin

IPC: G01L1/24 ,  A61B5/318 ,  A61B5/00 ,  G01D5/353

CPC classification number: G01L1/246 ,  A61B5/318 ,  A61B5/6852 ,  G01D5/35383 ,  G01L1/243

Abstract: A system, apparatus and method directed to detecting damage to an optical fiber. The optical fiber includes core fibers including a plurality of sensors configured to (i) reflect a light signal based on received incident light, and (ii) change a characteristic of the reflected light signal based on experienced strain. The system can include a console having memory storing logic that, when executed, causes operations of providing receiving reflected light signals of different spectral widths of the broadband incident light by one or more of the plurality of sensors, processing the reflected light signals to detect fluctuations of a portion of the optical fiber, and determining a location of the portion of the optical fiber or a defect affecting a vessel in which the portion is disposed based on the detected fluctuations. The portion may be a distal tip of the optical fiber.

公开(公告)号：US20170350774A1

公开(公告)日：2017-12-07

申请号：US15612993

申请日：2017-06-02

Applicant: Mark B. Woodbury

Inventor： Mark B. Woodbury

IPC: G01L1/24

CPC classification number: G01L1/243

Abstract: A direct light bend sensor is disclosed. A system that includes direct light bend sensor and method for measuring the force using a direct light bend sensor are also disclosed. In some embodiments, the direct light and sensor includes a tube that is elastically flexible, made of a darkening material, and has a light absorbing inner surface. In the embodiment, a light source is disposed in a first end portion of the tube and a photodetector is disposed in a second end portion of the tube. In the embodiment, an inner surface of the tube defines a bend-dependent direct light path from the light source to the photodetector through the tube.

公开(公告)号：US09568339B2

公开(公告)日：2017-02-14

申请号：US13990617

申请日：2011-12-02

Applicant: Kazi S. Abedin ,  Paul S. Westbrook

Inventor： Kazi S. Abedin ,  Paul S. Westbrook

IPC: G01D5/26 ,  G01J1/04 ,  G01L11/02 ,  G01H9/00 ,  G01L1/24 ,  G01N21/77 ,  H04R23/00 ,  G01D5/353

CPC classification number: G01D5/268 ,  G01D5/35316 ,  G01D5/3537 ,  G01D5/3538 ,  G01H9/004 ,  G01J1/0425 ,  G01L1/243 ,  G01L1/246 ,  G01L11/025 ,  G01N2021/7716 ,  H04R23/008

Abstract: Methods and systems using one or more distributed feedback (DFB) lasers for capturing changes in the lasing environment are disclosed. Specifically, a sensor for measuring a measurand, such as pressure or temperature, or changes in a measurand, includes a fiber with at least one core, at least one fiber laser cavity formed by a single fiber grating in the core, wherein the laser operates on at least two modes along at least part of its length. The DFB laser includes a section that is bent into a non-linear shape and at least one pump laser connected to the fiber laser cavity. When the DFB laser experiences a perturbation or measurand change that changes the spacing of the modes, a change in an RF beat note is generated. This beat note can then be measured and related to the measurand change.

Abstract translation: 公开了使用一个或多个分布式反馈（DFB）激光器捕获激光环境变化的方法和系统。 具体地说，用于测量诸如压力或温度的被测量或被测量的变化的传感器包括具有至少一个芯的光纤，由芯中的单个光纤光栅形成的至少一个光纤激光腔，其中激光器操作 沿其长度的至少一部分的至少两个模式。 DFB激光器包括弯曲成非线性形状的部分和连接到光纤激光腔的至少一个泵浦激光器。 当DFB激光器经历改变模式间距的扰动或被测量的变化时，产生RF拍音的变化。 然后可以测量这个拍音，并与被测量的变化相关。