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1. 发明授权

US5986784A Adaptive polarization diversity detection scheme for coherent communications and interferometric fiber sensors 失效
公开(公告)号：US5986784A
公开(公告)日：1999-11-16
申请号：US354931
申请日：1994-12-12
申请人： Alan D. Kersey , Michael J. Marrone , Anthony Dandridge
发明人： Alan D. Kersey , Michael J. Marrone , Anthony Dandridge
IPC分类号： H04B10/148 , G02B5/30
CPC分类号： H04B10/61 , H04B10/614 , H04B10/6151 , H04B10/64
摘要： A method and apparatus for overcoming polarization induced signal fading in both heterodyne communication and interferometric sensing. An adjustable birefringent element in series with a linear-polarization beam splitter forms an elliptical-polarization beam splitter. The birefringent element controllably evolves the states of polarization of two input signals thereby controlling the power contribution of each signal onto the orthogonal axes used by the linear beam splitter. When the states of polarization are evolved such that there are equal signal to reference power ratios on the beam splitter axes, subsequent detectors generate a constant, optimum amplitude signal without the need for weighting or decision circuits.

2. 发明授权

US5104222A System and method for minimizing input polarization-induced phase noise in an interferometric fiber-optic sensor depolarized input light 失效
标题翻译：用于在干涉光纤传感器去极化输入光中最小化输入偏振引起的相位噪声的系统和方法
公开(公告)号：US5104222A
公开(公告)日：1992-04-14
申请号：US584221
申请日：1990-09-18
申请人： Alan D. Kersey , Michael J. Marrone , Anthony Dandridge
发明人： Alan D. Kersey , Michael J. Marrone , Anthony Dandridge
IPC分类号： G01D5/353
CPC分类号： G01D5/35303
摘要： A system and method for minimizing polarization-induced phase noise in an interferometric fiber sensor is disclosed. The system includes an optical source of light; a single mode input fiber; means coupled between the optical source and the input fiber for scrambling the polarization state of the light from the optical source at a first frequency to effectively produce and pass depolarized light to the input fiber; an interferometric fiber sensor responsive to light from the input fiber for producing at its output an interference pattern proportional to a phase shift produced by a field being sensed by the interferometric fiber sensor; detection means responsive to the interference pattern for developing a photocurrent signal averaged over a period of time longer than the period of the first frequency; and demodulation means responsive to the photocurrent signal for producing an electrical output signal substantially proportional to the phase shift produced by the field being sensed by the interferometric sensor.
摘要翻译：公开了一种用于使干涉光纤传感器中的偏振相位噪声最小化的系统和方法。该系统包括光源光源; 单模输入光纤; 耦合在所述光源和所述输入光纤之间的装置，用于以第一频率扰乱来自所述光源的光的偏振状态，以有效地产生并将去偏振光传递到所述输入光纤; 响应于来自输入光纤的光的干涉光纤传感器，用于在其输出处产生与由干涉光纤传感器感测的场产生的相移成比例的干涉图案; 响应于所述干涉图案的检测装置，用于显影在比所述第一频率的周期长的时间段内平均的光电流信号; 以及响应于光电流信号的解调装置，用于产生基本上与由干涉测量传感器感测的场产生的相移成比例的电输出信号。

3. 发明授权

US5140154A Inline fiber optic sensor arrays with delay elements coupled between sensor units 失效
标题翻译：具有耦合在传感器单元之间的延迟元件的内联光纤传感器阵列
公开(公告)号：US5140154A
公开(公告)日：1992-08-18
申请号：US641843
申请日：1991-01-16
申请人： Aileen M. Yurek , Anthony Dandridge , Alan D. Kersey
发明人： Aileen M. Yurek , Anthony Dandridge , Alan D. Kersey
IPC分类号： G01D5/353 , G02B6/28
CPC分类号： G01D5/35383 , G02B6/2861
摘要： An improved inline fiber optic sensor array is achieved by packaging a pllity of fiber optic sensor units such that each fiber optic sensor unit incorporates a complete functional sensor and adjacent fiber optic sensor units are separated by a delay element connected in series between each pair of fiber optic sensor units. Delay elements temporally separate measureand signals received from the individual fiber optic sensor units and permit decoupling of signals produced in response to environmental stress on the non-sensor unit portions of the array.
摘要翻译：通过包装多个光纤传感器单元来实现改进的在线光纤传感器阵列，使得每个光纤传感器单元包括完整的功能传感器，并且相邻的光纤传感器单元由在每对光纤之间串联连接的延迟元件隔开光学传感器单元。延迟元件在时间上分离从各个光纤传感器单元接收的测量和信号，并且允许响应于阵列的非传感器单元部分上的环境应力产生的信号的去耦合。

4. 发明授权

US6081633A Fiber optic sensor array system with forward coupled topology 失效
标题翻译：具有正向耦合拓扑的光纤传感器阵列系统
公开(公告)号：US6081633A
公开(公告)日：2000-06-27
申请号：US552422
申请日：1995-11-03
申请人： Alan D. Kersey , Anthony Dandridge
发明人： Alan D. Kersey , Anthony Dandridge
IPC分类号： G01D5/353 , G02B6/00
CPC分类号： G01D5/35383
摘要： A forward-coupled array topology is used for a ladder-type fiber optic ser system in which each optical path in the system includes the same total number of input and output optical fiber sections and approximately the same total number of input and output couplers and splices so that the coupler splitting ratios for optimum optical performance are independent of light losses in the system.
摘要翻译：前向耦合阵列拓扑用于梯形光纤传感器系统，其中系统中的每个光路包括相同的输入和输出光纤部分的总数以及大致相同的输入和输出耦合器和接头总数使得用于最佳光学性能的耦合器分离比与系统中的光损耗无关。

5. 依法登记的发明

USH1626H Fiber optic network system with low crosstalk using code-division multiplexing 失效
标题翻译：使用码分复用的低串扰的光纤网络系统
公开(公告)号：USH1626H
公开(公告)日：1997-01-07
申请号：US10252
申请日：1993-01-28
申请人： Alan D. Kersey , Anthony Dandridge
发明人： Alan D. Kersey , Anthony Dandridge
IPC分类号： H04J14/00 , H04J14/02 , H04J13/02
CPC分类号： H04J14/005 , H04J14/02
摘要： A code-division multiplexed system comprising an optical source, a code generator for developing and applying a pseudo-random bit sequence code to the optical source to cause the optical source to develop a unipolar coded optical signal, a means for dividing the unipolar coded optical signal into N optical paths separated from each other by associated successive integer multiples of a bit period T of delay, N information signal sources responsive to the unipolar coded optical signals for selectively producing N differently-delayed optical information signals, a means for combining the N differently-delayed optical information signals into an output optical signal comprised of an intensity sum of the overlapping N differently-delayed optical unipolar information signals, a photodetector responsive to the output optical signal for developing an input electrical signal corresponding to the sum of N overlapping unipolar optical signals, an adjustable delay circuit responsive to the pseudo-random bit sequence code for producing a desired bipolar reference code corresponding to the delay associated with an associated desired one of the N differently-delayed optical information signals, and a correlation circuit responsive to the input electrical signal and to the desired bipolar reference code for synchronously correlating the desired bipolar reference code with the input electrical signal to extract a desired electrical signal corresponding to the desired one of the N differently-delayed optical information signals and to substantially suppress any other electrical signal that is asynchronously aligned with the desired bipolar reference code.
摘要翻译：一种码分复用系统，包括光源，代码发生器，用于将光学源开发并应用伪随机位序列以使光源产生单极编码的光信号;用于将单极编码光通过延迟的位周期T的相关联的连续整数倍的信号分离为N个光路，响应于单极编码光信号的N个信息信号源，用于选择性地产生N个不同延迟的光信息信号;组合N 不同延迟的光信息信号转换成由重叠的N个不同延迟的光学单极信息信号的强度和组成的输出光信号，响应于输出光信号的光电检测器，用于产生对应于N重叠单极性之和的输入电信号光信号，可调延迟电路，随机比特序列码，用于产生对应于与N个不同延迟的光信息信号中的相关联的期望的一个相关联的延迟的所需双极参考码，以及响应于输入电信号和期望的双极参考码用于同步的相关电路将期望的双极参考码与输入电信号相关联以提取对应于N个不同延迟的光信息信号中期望的一个的期望的电信号，并且基本上抑制与期望的双极性参考码异步对准的任何其它电信号。

6. 发明授权

US4907849A Integrated-optic, polarization-selective phase modulator 失效
标题翻译：集成光学，偏振选择相位调制器
公开(公告)号：US4907849A
公开(公告)日：1990-03-13
申请号：US233519
申请日：1988-08-18
申请人： Alan D. Kersey , Catherine Bulmer , Anthony Dandridge
发明人： Alan D. Kersey , Catherine Bulmer , Anthony Dandridge
IPC分类号： G02F1/01 , G02F1/035
CPC分类号： G02F1/035 , G02F2001/0144 , G02F2201/066
摘要： An integrated-optic, polarization-selective phase modulator is disclosed. a preferred embodiment of the invention a channel waveguide provides a path therethrough for polarized light having horizontal and vertical polarization components, and an electrode structure is disposed above the channel waveguide and is responsive to the application of a control voltage to the electrode structure for substantially phase modulating only the vertical component of the polarized light.
摘要翻译：公开了一种集成光学偏振选择相位调制器。在本发明的优选实施例中，通道波导为具有水平和垂直偏振分量的偏振光提供穿过其中的通路，并且电极结构设置在通道波导上方，并且响应于向电极结构施加控制电压，只调制偏振光的垂直分量。

7. 发明授权

US4889986A Serial interferometric fiber-optic sensor array 失效
标题翻译：串行干涉光纤传感器阵列
公开(公告)号：US4889986A
公开(公告)日：1989-12-26
申请号：US233521
申请日：1988-08-18
申请人： Alan D. Kersey , Anthony Dandridge
发明人： Alan D. Kersey , Anthony Dandridge
IPC分类号： G01D5/353
CPC分类号： G01D5/35383
摘要： A new serial interferometric fiber-optic sensor array configuration is diosed. In a preferred embodiment of the invention pulsed light from a laser source is transmitted into a long input fiber which forms a series of N sensor elements, each of optical path length L. Each sensor element is responsive to any change in an associated predetermined physical parameter for changing its optical path length. A small portion of the optical power in the input fiber is tapped-off to a long output fiber at tap points between adjacent sensor elements and at tap points before the first and after the last sensor elements in order to produce at the output of the last sensor element a series of N+1 pulses separated in the time domain. This series of N+1 pulses from the output of the last sensor element is applied to each of two paths in a compensating interferometer of optical path imbalance L. The compensating interferometer coherently mixes pulses obtained from each adjacent pair of tap points to obtain a series of interferometric signals respectively indicative of any change in the physical parameters to which the sensor elements are respectively responsive.
摘要翻译：公开了一种新的串行干涉光纤传感器阵列配置。在本发明的优选实施例中，来自激光源的脉冲光被传输到形成一系列N个传感器元件的长输入光纤，每个传感器元件具有光路长度L.每个传感器元件响应相关联的预定物理参数中的任何变化用于改变其光程长度。输入光纤中的光功率的一小部分在相邻传感器元件之间的分接点处和在最后一个传感器元件之前的抽头点处被分接到长输出光纤，以便在最后的传感器元件的输出处产生传感器元件在时域中分离出一系列N + 1个脉冲。将来自最后一个传感器元件的输出的这一系列N + 1个脉冲施加到光路不平衡L的补偿干涉仪中的两个路径中的每一个。补偿干涉仪相干地混合从每个相邻的抽头点获得的脉冲，以获得串联分别表示传感器元件分别响应的物理参数的任何变化的干涉信号。

8. 发明授权

US06285806B1 Coherent reflectometric fiber Bragg grating sensor array 失效
标题翻译：相干反射光纤布拉格光栅传感器阵列
公开(公告)号：US06285806B1
公开(公告)日：2001-09-04
申请号：US09093827
申请日：1998-05-31
申请人： Alan D. Kersey , Anthony Dandridge , Sandeep T. Vohra
发明人： Alan D. Kersey , Anthony Dandridge , Sandeep T. Vohra
IPC分类号： G02B600
CPC分类号： G01D5/35383 , G01H9/004 , G01M11/3118
摘要： A fiber optic sensor array has multiple segments, each capable of detecting a physical condition such as an acoustic wave. The segments are separated by weak reflectors such as fiber optic Bragg gratings. Light from a light source is input into the input end of the array. Light reflected by each of the reflectors has a phase shift representing the effects of the physical condition on all of the segments from the input end to that reflector. To address a specific reflector, the return light is demultiplexed. This demultiplexing is done by modulating the light input into the input end of the array with a pseudo-random bit sequence and correlating the output with a time-shifted version of the pseudo-random bit sequence to isolate the part of the output caused by that reflector. To address a specific segment, the phase shifts from two adjacent reflectors are determined. The return light can be strengthened by mixing it with a portion of the light picked off from the light source.
摘要翻译：光纤传感器阵列具有多个段，每个段能够检测诸如声波的物理条件。这些段由诸如光纤布拉格光栅的弱反射器分开。来自光源的光被输入到阵列的输入端。由每个反射器反射的光具有代表从输入端到该反射器的所有段的物理条件的影响的相移。为了寻址特定的反射器，返回光被解复用。这种解复用是通过用伪随机比特序列调制输入到阵列的输入端的光进行的，并将输出与伪随机比特序列的时移版本进行相关，以隔离由该随机比特序列引起的输出部分反射器。为了寻址特定的段，确定了两个相邻反射器的相移。可以通过将返回光与从光源拾取的光的一部分混合来加强返回光。

9. 发明授权

US4739661A Fiber-optic accelerometer having cantilevered acceleration-sensitive mass 失效
标题翻译：具有悬臂加速度敏感质量的光纤加速度计
公开(公告)号：US4739661A
公开(公告)日：1988-04-26
申请号：US37271
申请日：1987-04-10
申请人： Frank Bucholtz , Alan Kersey , Anthony Dandridge
发明人： Frank Bucholtz , Alan Kersey , Anthony Dandridge
IPC分类号： G01P15/093 , G01P15/08 , G01H9/00
CPC分类号： G01P15/093
摘要： An optical fiber accelerometer with a rectilinear actuator, such as a push rod, acting on a middle region of an optical fiber pass tautly strung between two supports so that linear actuator motion during sensed acceleration causes lateral displacement of the pass's middle region causing nonlinear (i.e., quadratic) strain in the fiber. This nonlinear response allows the accelerometer to detect acceleration signals in a noisy, low-frequency signal environment through use of a high frequency signal carrier whose amplitude is determined by a low-frequency measured acceleration signal using an optical fiber interferometer.
摘要翻译：作用在光纤中间区域的直线致动器（例如推杆）的光纤加速度传感器紧紧地夹在两个支架之间，使得在感测加速过程中的线性致动器运动导致通过中间区域的横向位移导致非线性（即，二次）应变。该非线性响应允许加速度计通过使用其频率由使用光纤干涉仪的低频测量加速度信号确定的高频信号载波来检测噪声低频信号环境中的加速度信号。

10. 发明授权

US4653915A Method for reduction of polarization fading in interferometers 失效
标题翻译：降低干涉仪偏振衰落的方法
公开(公告)号：US4653915A
公开(公告)日：1987-03-31
申请号：US722580
申请日：1985-04-12
申请人： Nicholas J. Frigo , Anthony Dandridge , Alan B. Tveten
发明人： Nicholas J. Frigo , Anthony Dandridge , Alan B. Tveten
IPC分类号： G01B9/02 , G02F1/01
CPC分类号： G01B9/02027
摘要： A passive device for reducing polarization fading in interferometers with significantly degrading the signal-to-noise ratio. In one embodiment, light from an interferometer output is passed through a lens to a polarization mask. The polarization mask comprises at least three distinct polarizers which pass distinct states of polarization. After passing through the polarizers each independently polarized signal is detected, demodulated and passed to a means for signal extraction.
摘要翻译：用于减少干涉仪中的偏振衰落的无源器件，而不会明显降低信噪比。在一个实施例中，来自干涉仪输出的光通过透镜到达偏振掩模。偏振掩模包括通过不同极化状态的至少三个不同的偏振器。在通过偏振器之后，每个独立的偏振信号被检测，解调并传递到用于信号提取的装置。

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