公开(公告)号：US09791335B2

公开(公告)日：2017-10-17

申请号：US15025334

申请日：2014-09-30

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Il-Bum Kwon ,  Joo Eun Im ,  Mi Hyun Kim ,  Ki Sun Choi

IPC: G01B11/16 ,  G01L1/24 ,  G01B1/00 ,  G01D5/353

CPC classification number: G01L1/246 ,  G01B1/00 ,  G01B11/16 ,  G01B11/165 ,  G01B11/18 ,  G01D5/353 ,  G01D5/35316 ,  G01D5/3537

Abstract: The present invention relates to an FBG sensor for measuring a maximum strain of an object being measured, a method for manufacturing the sensor, and a method of using the sensor. To this end, provided is the FBG sensor for measuring a maximum strain, comprising: an optical fiber (130) having an FBG sensor (150) therein; a first metallic foil (120) contacting the optical fiber (130) on one surface thereof; a second metallic foil (120) which comes into surface-contact with the one surface; an adhesive layer (140) provided between the first and second metallic foils (100, 120); a means for measuring a residual strain of the first and second metallic foils (100, 120) through the FBG sensor (150); and a means for calculating a maximum strain on the basis of the measured residual strain and a sensitivity coefficient (Csen) obtained through experimentation.

公开(公告)号：US20170284835A1

公开(公告)日：2017-10-05

申请号：US15631677

申请日：2017-06-23

Applicant: Weatherford Technology Holdings, LLC

Inventor： Domino TAVERNER

IPC: G01D5/353

CPC classification number: G01D5/35354 ,  G01D5/353 ,  G01D5/35316 ,  G01D5/35387 ,  G01K11/3206 ,  G01L1/246 ,  G02B6/29319

Abstract: Methods and apparatus for fast sweeping a spectral bandwidth in order to distinguish among signals received from effectively wavelength division multiplexed (WDMed) and time division multiplexed (TDMed) optical components on a single fiber. For some embodiments, a method for interrogating optical elements having characteristic wavelengths spanning a sweep range is provided. The method generally includes introducing a pulse of light, by an optical source, into an optical waveguide to interrogate at least a first set of optical elements having different characteristic wavelengths by performing a sweep of wavelengths over a period of the pulse, wherein the period is less than a round-trip time for light reflected from an optical element closest to the optical source to reach a receiver and processing the reflected light to determine a parameter based on the times at which signals are received.

公开(公告)号：US20170248480A1

公开(公告)日：2017-08-31

申请号：US15597539

申请日：2017-05-17

Applicant: SENTEK INSTRTUMENT LLC

Inventor： Bo Dong ,  Fabin Shen ,  Anbo Wang

IPC: G01L1/24 ,  E21B47/12 ,  G01D18/00 ,  G01D5/353

CPC classification number: G01L1/246 ,  E21B47/123 ,  G01D5/35312 ,  G01D5/35316 ,  G01D18/00

Abstract: A serial weak FBG interrogator is disclosed. The serial weak FBG interrogator may include a CW tunable laser or pulsed laser utilized as a laser source and an EDFA. The serial weak FBG interrogator may also be an interrogation of a single sensor system by utilization of a DFB laser which utilizes a single sensor, which may be an interferometer sensor, an extrinsic Fabry-Perot interferometer or a wavelength-modulated sensor. The serial weak FBG interrogator may also include a computer system or CSPU.

公开(公告)号：US09726538B2

公开(公告)日：2017-08-08

申请号：US14513458

申请日：2014-10-14

Applicant: OPTILAB, LLC

Inventor： Henry H. Hung

IPC: G01J1/42 ,  G01J3/02 ,  G01J3/42 ,  G01L1/24 ,  G01K11/32 ,  G01J3/28

CPC classification number: G01J3/0218 ,  G01J3/0245 ,  G01J3/42 ,  G01J2003/2859 ,  G01J2003/425 ,  G01K11/3206 ,  G01L1/246

Abstract: Various implementations of an apparatus for sensing one or more parameters are disclosed herein. The apparatus includes a sweeping wavelength laser configured to generate a sweeping wavelength optical signal; an optical fiber including a Fiber Bragg Grating (FBG) structure configured to sense a parameter, wherein the optical fiber is configured to receive the sweeping wavelength optical signal, wherein the FBG structure is configured to produce a reflected optical signal with a particular wavelength in response to the sweeping wavelength optical signal, and wherein the particular wavelength varies as a function of the parameter; a photo detector configured to generate an electrical signal based on the reflected optical signal; a comparator configured to generate a pulse based on a comparison of the electrical signal to a threshold; and a processor configured to generate an indication of the parameter based on the pulse. The comparator may be configured as a Schmitt trigger.

公开(公告)号：US09707032B2

公开(公告)日：2017-07-18

申请号：US15194040

申请日：2016-06-27

Applicant: COVIDIEN LP

Inventor： Duane E. Kerr ,  William H. Nau, Jr.

IPC: A61B18/18 ,  A61B17/00 ,  A61B18/14 ,  G01K11/32 ,  G01L1/24 ,  A61B18/12 ,  A61B18/00 ,  A61B90/00

CPC classification number: A61B18/1445 ,  A61B18/1206 ,  A61B18/1482 ,  A61B90/06 ,  A61B2017/00057 ,  A61B2018/00077 ,  A61B2018/00095 ,  A61B2018/00178 ,  A61B2018/0063 ,  A61B2018/00648 ,  A61B2018/00791 ,  A61B2018/00797 ,  A61B2018/126 ,  A61B2090/064 ,  A61B2562/0266 ,  G01K11/3206 ,  G01L1/246

Abstract: A surgical instrument includes an end effector including first and second jaw members movable relative to one another between a first, spaced-apart position and a second position proximate tissue. In the second position, the jaw members cooperate to grasp tissue therebetween. A first optical fiber is disposed within the first jaw member and is configured to provide a first signal, and a second optical fiber is disposed within the first jaw member and is configured to provide a second signal. A controller is coupled to the first and second fibers and is configured to determine the temperature and the strain of the first jaw member as a function of the first and second signals, respectively.

公开(公告)号：US20170176270A1

公开(公告)日：2017-06-22

申请号：US15382012

申请日：2016-12-16

Applicant: Gabriel P. Kern ,  Kenneth M. Bueche ,  Timothy Daugherty

Inventor： Gabriel P. Kern ,  Kenneth M. Bueche ,  Timothy Daugherty

IPC: G01L1/24 ,  G01K11/32 ,  A61B5/0215 ,  G02B6/44

CPC classification number: G01L1/246 ,  A61B5/0215 ,  G01K11/3206 ,  G02B6/4402 ,  G02B6/4415 ,  G02B6/4486

Abstract: A miniature pressure sensor has been designed based on an optical fiber with fiber bragg grating (FBG). The fiber can be attached to a portion of tubing by co-extrusion, braiding, gluing, or other equivalent methods, where the portion of tubing is flexible and a first side is exposed to the fluid/gas being measured (Pm) and a second side is exposed to a reference pressure (Pref).

公开(公告)号：US20170146338A1

公开(公告)日：2017-05-25

申请号：US15321934

申请日：2015-06-07

Applicant: ILLINOIS TOOL WORKS INC.

Inventor： Roy D. ALLEN

IPC: G01B11/16

CPC classification number: G01B11/161 ,  G01B11/165 ,  G01L1/246

Abstract: This disclosure presents a method of measuring the strain response of a test material remotely by optical devices using a thin multi-layer assembly, called an optical strain gauge, which is attached directly to the test specimen by pair of adhesive patches built into the assembly. The optical strain gauge assembly attaches quickly and easily by just pressing it onto the specimen by virtue of the two pressure-activated adhesive patches. There is typically no surface preparation necessary for the test specimen. The spatial separation between the two patches adhered to the specimen surface serves to establish an initial gauge length for calculating strain by measuring the stress induced changes to this separation when a load is applied to the test specimen.

公开(公告)号：US20170052091A1

公开(公告)日：2017-02-23

申请号：US14829778

申请日：2015-08-19

Applicant: ANRITSU CORPORATION

Inventor： Takashi Mori

IPC: G01M11/08 ,  G02B6/27 ,  G01B11/14 ,  G02B6/35 ,  G01L1/24 ,  G01B11/24 ,  G02B6/02 ,  H01S3/08

CPC classification number: G01M11/088 ,  G01B11/14 ,  G01B11/2441 ,  G01L1/246 ,  G02B6/02042 ,  G02B6/02085 ,  G02B6/2753 ,  G02B2006/12138

Abstract: To eliminate a need for polarization adjustment, to simplify a configuration, and to make a configuration at low cost. Wavelength swept light is provided to a measurement-target optical fiber having an FBG with a chirped grating interval. A polarization multiplexing unit generates polarization multiplexed reference light by multiplexing first reference light and second reference light, which are swept in a wavelength in the same manner as wavelength swept light and have polarizations orthogonal to each other. Polarization multiplexed reference light is input to combine means along with reflected light from measurement-target optical fiber and is made to interfere with reflected light. A signal processing unit performs Fourier transform processing on the digital signal by dividing a time domain into a plurality of periods, and synthesizes the Fourier transform results on a distance axis to obtain a measurement result of orthogonal polarization components of reflected light.

Abstract translation: 为了消除极化调整的需要，简化配置，并以低成本进行配置。 波长扫描光被提供给具有啁啾光栅间隔的FBG的测量目标光纤。 偏振复用单元通过以与波长扫描光相同的方式以波长扫描并且具有彼此正交的偏振的第一参考光和第二参考光多路复用生成偏振复用参考光。 偏振多路复用参考光被输入到组合装置以及来自测量目标光纤的反射光，并使其与反射光干涉。 信号处理单元通过将时域划分为多个周期对数字信号进行傅立叶变换处理，并且在距离轴上合成傅里叶变换结果，以获得反射光的正交偏振分量的测量结果。

公开(公告)号：US20170033414A1

公开(公告)日：2017-02-02

申请号：US14810919

申请日：2015-07-28

Applicant: Palo Alto Research Center Incorporated

Inventor： Anurag Ganguli ,  Julian Schwartz ,  Ajay Raghavan ,  Peter Kiesel ,  Bhaskar Saha ,  Saroj Sahu ,  Lars Wilko Sommer

IPC: H01M10/42 ,  G01L1/24 ,  G01R31/36 ,  H01M10/48

CPC classification number: H01M10/4285 ,  G01D3/036 ,  G01D5/353 ,  G01L1/246 ,  G01R31/392 ,  H01M10/425 ,  H01M10/48 ,  H01M10/486

Abstract: A system includes a first optical sensor sensitive to both a parameter of interest, Parameter1, and at least one confounding parameter, Parameter2 and a second optical sensor sensitive only to the confounding parameter. Measurement circuitry measures M1 in response to light scattered by the first optical sensor, where M1=value of Parameter1+K*value of Parameter2. The measurement circuitry also measures M2 in response to light scattered by the second optical sensor, where M2=value of Parameter2. Compensation circuitry determines a compensation factor, K, for the confounding parameter based on measurements of M1 and M2 taken over multiple load/unload cycles or over one or more thermal cycles. The compensation factor is used to determine the parameter of interest.

Abstract translation: 系统包括对感兴趣的参数，参数1和至少一个混杂参数（Parameter2）敏感的第一光学传感器和仅对混杂参数敏感的第二光学传感器。 测量电路响应于由第一光学传感器散射的光而测量M1，其中M1 = Parameter2的参数1 + K *值的值。 测量电路还响应于由第二光学传感器散射的光来测量M2，其中M2 = Parameter2的值。 补偿电路基于多个负载/卸载循环或超过一个或多个热循环的M1和M2的测量值，确定混合参数的补偿因子K。 补偿因子用于确定感兴趣的参数。

公开(公告)号：US09523354B2

公开(公告)日：2016-12-20

申请号：US13809977

申请日：2011-07-12

Applicant: Ib Svend Olesen

Inventor： Ib Svend Olesen

IPC: F03D80/40 ,  F03D17/00 ,  G01L1/24 ,  F03D11/00 ,  G01M5/00

CPC classification number: F03D17/00 ,  F03D80/40 ,  F05B2260/845 ,  F05B2270/331 ,  F05B2270/802 ,  F05B2270/808 ,  G01L1/246 ,  G01M5/0016 ,  Y02E10/72 ,  Y02E10/722

Abstract: The invention provides a method and system of detecting ice or other foreign matter on a wind turbine blade or damage to a wind turbine blade. The method in one aspect comprises: measuring twisting torque on the blade about its longitudinal axis to provide a detected torque signal; comparing a value based on the detected torque signal with a comparison value, the comparison value derived from one or more measured parameters having a predetermined relationship with the twisting torque about the longitudinal axis of the blade when the blade is operating under normal operating conditions; and determining that ice or other foreign matter is on the blade or that the blade is damaged if the value based on the detected torque signal differs from the comparison value by more than a predetermined amount. Wind turbine blades are designed such that any change in the shape of the blade reduces twisting torque on the blades significantly. Torque about the longitudinal axis of the blade can therefore be used as a sensitive indicator of ice on the blade and of damage to the blade.

Abstract translation: 本发明提供了一种在风力涡轮机叶片上检测冰或其它异物或损坏风力涡轮机叶片的方法和系统。 在一个方面中的方法包括：测量叶片围绕其纵向轴线的扭转扭矩以提供检测到的扭矩信号; 将基于所检测到的扭矩信号的值与比较值进行比较，所述比较值从当在所述叶片在正常操作条件下操作时围绕所述叶片的纵向轴线的扭转扭矩具有预定关系的一个或多个测量参数导出; 并且如果基于检测到的扭矩信号的值与比较值不同于预定量，则确定冰或其它异物在叶片上或者叶片被损坏。 风力涡轮机叶片被设计成使得叶片的形状的任何变化显着降低了叶片上的扭转扭矩。 因此，关于叶片的纵向轴线的扭矩因此可以用作叶片上的冰的敏感指示器和叶片的损坏。