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公开(公告)号：US06328837B1
公开(公告)日：2001-12-11
申请号：US09453024
申请日：1999-12-02
申请人： Sandeep T. Vohra , Bruce Danver , Alan Tveten , Anthony Dandridge
发明人： Sandeep T. Vohra , Bruce Danver , Alan Tveten , Anthony Dandridge
IPC分类号： B65H8100
CPC分类号： G01P15/093
摘要： The interferometric fiber optic accelerometer is viewed as a mass-spring transducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure. Fabrication of the optical fiber coils is accomplished by winding the optical fiber, with a specially designed chuck to form reference and sensing fiber coils which are then bonded to the flexural disk to form the accelerometer.
摘要翻译： 干涉光纤加速度计被视为容纳在传感器壳体中的质量弹簧传感器。 传感器外壳安装在运动部分上，运动是通过质量传感器和传感器外壳之间的相对运动来推断的。 弯曲盘被容纳在传感器壳体中，该传感器壳体沿垂直于板表面的方向被加速。 板经受位移，导致板表面上的应变。 将制成光干涉仪的一部分的光纤线圈连接到弯曲盘上，将来自盘的应变传递到光纤，从而改变光纤干涉仪的路径长度。 干涉仪输出解调后提供加速响应。 加速度计壳体的设计使得其对外部信号（即动态和静水压力）是高度免疫的。 通过用专门设计的卡盘卷绕光纤来形成光纤线圈的制造，以形成参考和感测纤维线圈，然后将纤维线圈结合到弯曲盘以形成加速度计。
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公开(公告)号：US6056032A
公开(公告)日：2000-05-02
申请号：US138018
申请日：1998-08-21
申请人： Sandeep T. Vohra , Bruce Danver , Alan Tveten , Anthony Dandridge
发明人： Sandeep T. Vohra , Bruce Danver , Alan Tveten , Anthony Dandridge
IPC分类号： G01P15/093 , B31C3/16 , B65H81/00
CPC分类号： G01P15/093
摘要： The interferometric fiber optic accelerometer is viewed as a mass-spring nsducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure. Fabrication of the optical fiber coils is accomplished by winding the optical fiber, with a specially designed chuck to form reference and sensing fiber coils which are then bonded to the flexural disk to form the accelerometer.
摘要翻译： 干涉光纤加速度计被视为容纳在传感器壳体中的质量弹簧传感器。 传感器外壳安装在运动部分上，运动是通过质量传感器和传感器外壳之间的相对运动来推断的。 弯曲盘被容纳在传感器壳体中，该传感器壳体沿垂直于板表面的方向被加速。 板经受位移，导致板表面上的应变。 将制成光干涉仪的一部分的光纤线圈连接到弯曲盘上，将来自盘的应变传递到光纤，从而改变光纤干涉仪的路径长度。 干涉仪输出解调后提供加速响应。 加速度计壳体的设计使得其对外部信号（即动态和静水压力）是高度免疫的。 通过用专门设计的卡盘卷绕光纤来形成光纤线圈的制造，以形成参考和感测纤维线圈，然后将纤维线圈结合到弯曲盘以形成加速度计。
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公开(公告)号：US5903349A
公开(公告)日：1999-05-11
申请号：US845244
申请日：1997-04-21
申请人： Sandeep T. Vohra , Bruce Danver , Alan Tveten , Anthony Dandridge
发明人： Sandeep T. Vohra , Bruce Danver , Alan Tveten , Anthony Dandridge
IPC分类号： G01P15/093 , G01B9/02
CPC分类号： G01P15/093
摘要： The interferometric fiber optic accelerometer is viewed as a mass-spring transducer housed in a sensor case. The sensor case is attached to a moving part whose motion is inferred from the relative motion between the mass and the sensor case. A flexural disk is housed in a sensor case which is accelerated in a direction normal to the plate surface. The plate undergoes displacement resulting in strains on the plate surface. A coil of optical fiber, made to be part of an optical interferometer, is attached to the flexural disk, the strain from the disk is transferred to the fiber thus changing the path length of the fiber interferometer. The interferometer output in demodulated providing the acceleration response. The design of the accelerometer housing is such that it is highly immune to extraneous signals, i.e., dynamic and hydrostatic pressure. Fabrication of the optical fiber coils is accomplished by winding the optical fiber, with a specially designed chuck to form reference and sensing fiber coils which are then bonded to the flexural disk to form the accelerometer.
摘要翻译： 干涉光纤加速度计被视为容纳在传感器壳体中的质量弹簧传感器。 传感器外壳安装在运动部分上，运动是通过质量传感器和传感器外壳之间的相对运动来推断的。 弯曲盘被容纳在传感器壳体中，该传感器壳体沿垂直于板表面的方向被加速。 板经受位移，导致板表面上的应变。 将制成光干涉仪的一部分的光纤线圈连接到弯曲盘上，将来自盘的应变传递到光纤，从而改变光纤干涉仪的路径长度。 干涉仪输出解调后提供加速响应。 加速度计壳体的设计使得其对外部信号（即动态和静水压力）是高度免疫的。 通过用专门设计的卡盘卷绕光纤来形成光纤线圈的制造，以形成参考和感测纤维线圈，然后将纤维线圈结合到弯曲盘以形成加速度计。
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4.发明授权公开(公告)号：US06611633B1
公开(公告)日：2003-08-26
申请号：US09534047
申请日：2000-03-24
IPC分类号： G02B600
摘要： This invention pertains to a sensor comprising of glass optical fiber, a cellular pressure release material surrounding the fiber, and means for determining responsivity of the sensor, the sensor having responsivity of at least about −160 dB re rad/m-&mgr;/Pa, which corresponds to sensitivity of about 50 times better than prior art. The sensor can be made part of an optical interferometer which is characterized by splitting of an entering light beam and measurement of an optical phase shift caused by light traversing different paths. The sensor can form a part of a fiber Bragg grating geometry characterized by a fiber Bragg grating in the glass fiber covered by the cellular pressure release material wherein shift of the Bragg wavelength induced by strain on to the cellular pressure release material is measured.
摘要翻译： 本发明涉及包括玻璃光纤，围绕光纤的蜂窝压力释放材料和用于确定传感器的响应度的装置的传感器，该传感器具有至少约-160dB雷达/ m-mu / Pa的响应度， 这对应于比现有技术好约50倍的灵敏度。 传感器可以制成光干涉仪的一部分，其特征在于分离进入的光束和由穿过不同路径的光引起的光学相移的测量。 传感器可以形成光纤布拉格光栅几何的一部分，其特征在于由细胞压力释放材料覆盖的玻璃纤维中的光纤布拉格光栅，其中测量由应变引起的布拉格波长向细胞压力释放材料的偏移。
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公开(公告)号：US06285806B1
公开(公告)日：2001-09-04
申请号：US09093827
申请日：1998-05-31
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。
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6.发明授权Inline fiber optic sensor arrays with delay elements coupled between sensor units 失效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
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。
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7.发明授权
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。
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公开(公告)号：US4653915A
公开(公告)日：1987-03-31
申请号：US722580
申请日：1985-04-12
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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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
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。
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公开(公告)号：US5986784A
公开(公告)日：1999-11-16
申请号：US354931
申请日：1994-12-12
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.
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