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1. 发明授权

US11796406B2 Apparatus and method for detecting composite material damage due to impact by using distributed optical fibers 有权
公开(公告)号：US11796406B2
公开(公告)日：2023-10-24
申请号：US16961160
申请日：2019-01-10
申请人： KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE
发明人： Il-Bum Kwon , Dae-Cheol Seo , Chi Yup Kim
IPC分类号： G01L1/24 , G01D5/353 , G01M5/00
CPC分类号： G01L1/242 , G01D5/35351 , G01M5/0033
摘要： An apparatus and method for detecting composite material damage due to impact by using distributed optical fiber are disclosed. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, the position and level of damage occurring in a composite material due to low-velocity impact can be effectively and economically detected by measuring the residual strain of optical fiber distributed on the surface of the composite material or inside the composite material. In the apparatus and method for detecting composite material damage due to impact by using distributed optical fiber, there is no need to always operate a sensor in real time, so that detection errors due to temporary failures, malfunctions, etc. of the sensor, as well as a problem of constantly supplying power to the sensor, can be essentially removed.

2. 发明申请

US20180299301A1 MONITORING TRANSPORTATION SYSTEMS 审中-公开
公开(公告)号：US20180299301A1
公开(公告)日：2018-10-18
申请号：US15488021
申请日：2017-04-14
申请人： Palo Alto Research Center Incorporated
发明人： Ajay Raghavan , Kyle Arakaki , Andreas Schuh , Alex Hegyi , Peter Kiesel , Anurag Ganguli
IPC分类号： G01D5/353 , G01P3/36
CPC分类号： G01D5/35387 , B61L23/044 , B61L23/045 , B61L27/0088 , G01B11/18 , G01D5/35351 , G01D5/3539 , G01L1/246 , G01L1/247 , G01M5/0008 , G01M5/0025 , G01M5/0033 , G01M5/0041 , G01M5/0066 , G01M5/0091 , G01M11/085 , G01P3/36
摘要： A monitoring system includes optical sensors disposed on one or more fiber optic waveguides. Each optical sensor is spaced apart from other optical sensors and is disposed at a location along a route defined by a transportation structure that supports a moveable conveyance. The plurality of optical sensors are mechanically coupled to one or both of the transportation structure and the moveable conveyance. Each optical sensor provides an optical output signal responsive to vibrational emissions of one or both of the transportation structure and the conveyance. The monitoring system includes a detector unit configured to convert optical output signals from the optical sensors to electrical signals. A data acquisition controller synchronizes recordation of the electrical signals with movement of the conveyance.

3. 发明授权

US07359586B2 Fiber optic strain sensor and associated data acquisition system 失效
标题翻译：光纤应变传感器及相关数据采集系统
公开(公告)号：US07359586B2
公开(公告)日：2008-04-15
申请号：US11164113
申请日：2005-11-10
申请人： Gennadii Ivtsenkov
发明人： Gennadii Ivtsenkov
IPC分类号： G02B6/00
CPC分类号： G01H9/004 , G01D5/344 , G01D5/35351 , G01F1/206 , G01F1/28 , G01F1/80 , G01L1/243 , G01L9/0007 , G01L9/0032 , G01L9/0039 , G01P15/093 , G01P15/18
摘要： A fiber optic polarimetric strain sensor and associated data acquisition system capable of all-optical measurements of physical parameters, such as structural strain, gas and liquid pressure, acceleration and vibration, gas and liquid flow rate, and force without fire and explosion hazards associated with conventional strain gage technologies, such as resistance foil strain gages. The polarimetric strain sensor houses a sensitive element—a length of single-mode optic fiber—changing polarization of a single-mode optical signal running in the fiber under some mechanical effects, specifically twisting and radial compressing. A multi-channel time division multiplexing data acquisition system indicates the polarization state deviation caused by the strain, so allow measuring the parameters. The invention may be embodied for measurements of any phenomenon that can be transformed in stress on an optical fiber.
摘要翻译：一种光纤偏振应变传感器和相关的数据采集系统，能够对物理参数进行全光学测量，如结构应变，气体和液体压力，加速度和振动，气体和液体流速以及与此相关的无火灾和爆炸危险的力常规应变计技术，如电阻箔应变计。偏振应变传感器容纳一个敏感元件 - 在一些机械效应下，特别是扭曲和径向压缩，在光纤中运行的单模光信号的单模光纤变化极化的长度。多通道时分复用数据采集系统表示由应变引起的极化状态偏差，因此可以测量参数。本发明可以被实施用于测量可以在光纤上应力变化的任何现象。

4. 发明授权

US5471546A Fiber-optic transmission sensor with modulator 失效
标题翻译：带调制器的光纤传输传感器
公开(公告)号：US5471546A
公开(公告)日：1995-11-28
申请号：US354809
申请日：1994-12-13
申请人： Markus Meier
发明人： Markus Meier
IPC分类号： G01C19/72 , G01D5/353 , G01N21/21 , G01N21/41 , G01R15/24 , G01C19/64 , G02B6/17
CPC分类号： G01R15/246 , G01D5/344 , G01D5/35351
摘要： Fiber-optic sensors are used in reflection or transmission operation in almost all fields of measuring technology, inter alia for monitoring industrial installations, in medical diagnostics and in aerospace. In this context, the effects of mechanical, electrical, magnetic, acoustic, thermal and chemical signals are evaluated. In order to make possible a simpler signal evaluation, laser light from a light source is coupled into a feed line optical fiber parallel to one of its two principal axes. At a 1st splice point, the light is introduced into a 1st reference optical fiber, whose principal axes are rotated with respect to those of the feed line optical fiber by 45.degree.. At a 2nd splice point, the light reaches a 2nd reference optical fiber of the same length as the 1st reference optical fiber and with its principal axes rotated with reference to the 1st reference optical fiber by 90.degree.. At a 3rd splice point, the light is coupled into a low-birefringent optical fiber, which firstly forms a .lambda./4-fiber-optic loop and subsequently forms an optical sensor. By means of a phase modulator (M) in conjunction with the 1st reference optical fiber, the phase shift of the light can be influenced statically or dynamically.
摘要翻译：光纤传感器几乎用于测量技术的各个领域，用于反射或传输操作，特别是用于监测工业设备，医疗诊断和航空航天。在这方面，评估了机械，电，磁，声，热和化学信号的影响。为了使得更简单的信号评估成为可能，来自光源的激光被耦合到平行于其两个主轴之一的馈线光纤中。在第一个拼接点，将光引入第一个参考光纤，其主轴相对于馈线光纤旋转45度。在第二个接合点处，光到达与第一个参考光纤相同长度的第二个参考光纤，其主轴相对于第一个参考光纤旋转90°。在第三拼接点，光被耦合到低双折射光纤中，其首先形成λ/ 4光纤环路并随后形成光学传感器。通过与第一参考光纤结合的相位调制器（M），可以静态地或动态地影响光的相移。

5. 发明授权

US4944571A Optical fibers 失效
标题翻译：光纤
公开(公告)号：US4944571A
公开(公告)日：1990-07-31
申请号：US97826
申请日：1987-09-17
申请人： Alan J. Rogers
发明人： Alan J. Rogers
IPC分类号： G01R33/032 , G01D5/353 , G01J5/08 , G01J5/10 , G01M11/00 , G01R15/24 , G02B6/00 , G02F1/01 , G02F1/11
CPC分类号： G01M11/088 , G01D5/344 , G01D5/35351 , G01M11/3181 , G01R15/246 , G02F1/0134
摘要： Simultaneous time-variable and position-variable control of the polarization properties from any position along the length of an optical fibre, is effected by launching an acoustic disturbance into the fibre, thereby locally modifying the birefringence of the fibre. A current measurement device incorporating a monomode optical fiber 1 may be made insensitive to vibration by launching an acoustic wave from one end of the fiber. This wave 7 consists of two linearly polarized shear waves orthogonal in direction, and in phase quadrature is of such an amplitude and frequency as to provide a circular birefringence very much greater than the vibrationally-induced linear birefringence.

6. 发明申请

US20180058886A1 OPTICAL FIBER SENSOR DEVICE AND VIBRATION POSITION SPECIFYING METHOD 审中-公开
公开(公告)号：US20180058886A1
公开(公告)日：2018-03-01
申请号：US15640677
申请日：2017-07-03
申请人： Oki Electric Industry Co., Ltd.
发明人： Yoshihiro KANDA
IPC分类号： G01D5/353 , G01D5/34 , G01N29/24
CPC分类号： G01D5/353 , G01D5/344 , G01D5/35351 , G01N29/2418
摘要： The optical fiber sensor device comprises a probe light supply unit, an optical fiber sensor unit, and a polarization state measuring unit. The probe light supply unit generates and outputs a polarization switched light beam by alternately switching a polarized CW light beam in polarization directions orthogonal to each other with elapse of time. The optical fiber sensor unit includes a loop-state optical fiber into which the polarization switched light beam is input and which outputs a light wave reflecting a change of birefringence according to a stress applied from an outside in the polarization switched light beam. The polarization state measuring unit observes polarization states of the respective light waves propagating clockwise and counterclockwise through the optical fiber. The polarization state measuring unit calculates an angular velocity vector ωb defined by an equation that specifies a relationship between a temporal change rate dsout(t)/dt of a Stokes vector sout(t) giving a polarization state of the light wave from the optical fiber and the Stokes vector sout(t) for each of the clockwise and counterclockwise light waves. The angular velocity vector ωb gives a direction of a rotation center axis and a rotation angular velocity of the Stokes vector sout(t).

7. 发明申请

US20170005721A1 METHOD AND APPARATUS FOR DETERMINING A SIGNAL TRANSMISSION QUALITY OF A LIGHT TRANSMISSION PATH 有权
标题翻译：用于确定光传输路径的信号传输质量的方法和装置
公开(公告)号：US20170005721A1
公开(公告)日：2017-01-05
申请号：US15038881
申请日：2014-10-27
申请人： LEMFÖRDER ELECTRONIC GMBH
发明人： Thomas Erdmann , Jorg Jahn
IPC分类号： H04B10/07 , G01J1/16 , F16H59/10 , G01J1/42
CPC分类号： H04B10/07 , F16H59/105 , G01D5/35351 , G01J1/16 , G01J1/42 , H04B10/0775
摘要： The approach relates to a procedure for determining a signal transmission quality of a light transmission path, which consists of a light transmitter on one end and a light receiver on its other end. A transmitter code is received in a first step. The transmitter code hereby represents a signal which is transmitted from the light transmitter to the light receiver. In a further step the receiver code is read in. The receiver code hereby represents a signal which was provided by the light receiver by using the transmitter code. The determining of a degree of correspondency between the transmitter code and the receiver code is performed in a final step of determining, in order to define the signal transmission quality of the light transmission path.
摘要翻译：该方法涉及一种用于确定光传输路径的信号传输质量的过程，该传输路径由一端的光发射器和另一端的光接收器组成。在第一步骤中接收发射机代码。发射机代码在此表示从光发射机发射到光接收器的信号。在另一步骤中，接收器代码被读入。接收器代码在此表示由光接收器通过使用发送器代码提供的信号。在确定光传输路径的信号传输质量的最后步骤中，执行发射机码和接收码之间的对应度的确定。

8. 发明申请

US20150069996A1 OPTICAL FIBER FOR A SENSOR AND A POWER DEVICE MONITORING SYSTEM 审中-公开
标题翻译：用于传感器和功率器件监测系统的光纤
公开(公告)号：US20150069996A1
公开(公告)日：2015-03-12
申请号：US14373833
申请日：2013-01-21
申请人： KABUSHIKI KAISHA TOYOTA JIDOSHOKKI , NATIONAL UNIVERSITY CORPORATION KAGAWA UNIVERSITY , INSTITUTE OF NATIONAL COLLEGES OF TECH. JAPAN
发明人： Ko Imaoka , Yoshifumi Suzaki , Hiromu Iwata , Kiyoshi Nakagawa
IPC分类号： G01R19/00 , G01D5/353 , G01R1/44 , G02B6/34
CPC分类号： G01R19/00 , G01D5/35316 , G01D5/35345 , G01D5/35351 , G01D5/35377 , G01D5/3538 , G01K11/3206 , G01R1/44 , G01R15/22 , G01R15/24 , G01R19/03 , G02B6/02204 , G02B6/34
摘要： An optical fiber for a sensor that can measure a current or a voltage precisely is provided. The optical fiber for the sensor 10 comprises: an FBG 12 wherein a refractive index of a core changes periodically; a metal layer 13 for sheathing the FBG 12; and a pair of electrodes 14 and 15 provided at the metal layer 13. The electrodes 14 and 15 are connected to an object to be measured in desired positions. Current flowing through the metal layer 13 is calculated based on variation in Bragg wavelength of the FBG 12.
摘要翻译：提供了可以精确地测量电流或电压的用于传感器的光纤。用于传感器10的光纤包括：FBG 12，其中芯的折射率周期性地变化; 用于包覆FBG 12的金属层13; 以及设置在金属层13的一对电极14和15.电极14和15在期望的位置连接到被测量物体。基于FBG 12的布拉格波长的变化计算流过金属层13的电流。

9. 发明授权

US08736826B2 Monitoring for disturbance of optical fiber 有权
标题翻译：监测光纤干扰
公开(公告)号：US08736826B2
公开(公告)日：2014-05-27
申请号：US13355406
申请日：2012-01-20
申请人： Peter Scott Lovely , Michael James Brown
发明人： Peter Scott Lovely , Michael James Brown
IPC分类号： G01N21/00 , H04B17/00
CPC分类号： G01D5/353 , G01D5/35351 , G01M11/33
摘要： Problems of excessive fading in systems for monitoring single-mode optical fiber for physical disturbances are addressed by launching into the fiber polarized light having at least two different predetermined launch states of polarization whose respective Stokes vectors are linearly-independent of each other; downstream from the first location, receiving the light from the fiber; analyzing the received light using polarization state analyzer means having at least two different analyzer states of polarization that are characterized by respective Stokes vectors that are linearly-independent of each other and detecting the analyzed light to provide corresponding detection signals; deriving from the detection signals measures of changes in polarization transformation properties of the fiber between different times that are substantially independent of said launch states and said detection states; and, on the basis of predefined acceptable physical disturbance criteria determining whether or not the measures are indicative of a reportable physical disturbance.
摘要翻译：用于监测用于物理扰动的单模光纤的系统中的过度衰落的问题通过发射到具有至少两个不同的预定的极化发射状态的光纤偏振光来解决，其各自的斯托克斯矢量彼此线性独立; 从第一位置下游，接收来自光纤的光; 使用具有至少两个不同的偏振分析器状态的极化状态分析器装置来分析所接收的光，所述分析器状态由彼此线性相关的相应的斯托克斯矢量表征，并且检测分析的光以提供相应的检测信号; 从所述检测信号中得出的测量在与所述发射状态和所述检测状态基本上无关的不同时间之间的所述光纤的偏振变换特性的变化; 并且基于预定的可接受的身体干扰标准，确定措施是否指示可报告的身体干扰。

10. 发明申请

US20100315621A1 PHASE MODULATOR, PHASE MODULATOR ASSEMBLY, AND PHOTOSENSOR 有权
标题翻译：相位调制器，相位调制器总成和光电传感器
公开(公告)号：US20100315621A1
公开(公告)日：2010-12-16
申请号：US12812320
申请日：2009-01-09
申请人： Kinichi Sasaki , Masao Takahashi , Masahiro Hamaguchi , Takashi Miyabe , Tsuyoshi Kuwabara , Tokihiro Umemura
发明人： Kinichi Sasaki , Masao Takahashi , Masahiro Hamaguchi , Takashi Miyabe , Tsuyoshi Kuwabara , Tokihiro Umemura
IPC分类号： G01N21/17 , G02F1/01 , G01N21/00
CPC分类号： G01C19/721 , G01D5/344 , G01D5/35351 , G01D5/3538 , G02B6/024 , G02B6/274 , G02F1/0134 , G02F2203/15 , G02F2203/50
摘要： The present invention provides a photosensor that uses a phase modulation technique for optical detection and conducts a highly accurate measurement. The photosensor uses a phase change difference of light propagated through a polarization preserving fiber with respect to tensile stress and employs proper polarization preserving fibers for a phase modulator 10, light-transmitting polarization preserving fiber 23, and coil-shaped polarization preserving fiber 30, to achieve a highly accurate measurement.
摘要翻译：本发明提供一种光传感器，其使用相位调制技术进行光学检测，并进行高精度的测量。光传感器使用相对于拉伸应力通过偏振保留光纤传播的光的相变差，并且对于相位调制器10，透光偏振保留光纤23和线圈状偏振保留光纤30采用适当的偏振保留光纤，实现高精度测量。

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