公开(公告)号：US5618108A

公开(公告)日：1997-04-08

申请号：US434948

申请日：1995-05-04

申请人： Yukio Sai ,  Hiroyuki Kaneko ,  Yuji Miyane

发明人： Yukio Sai ,  Hiroyuki Kaneko ,  Yuji Miyane

IPC分类号： G01K11/32

CPC分类号： G01K11/32

摘要： An apparatus for measuring a temperature distribution along an optical fiber, comprises a light source for inputting pulsed-light into the optical fiber, an optical filter for receiving backward Raman-scattered light from the optical fiber and extracting anti-Stokes' light and Stokes' light, an optical attenuator for attenuating the intensity of the Stokes' light extracted by the optical filter, first and second signal paths each of which includes a light-receiving element and an analog-to-digital converter, a signal processor for calculating a temperature distribution along the optical fiber on the basis of the first and second signal paths, and an optical switch having a first input port for receiving the anti-Stokes' light, a second input port for receiving the Stokes' light, a first output port, and a second output port, the optical switch transmitting the anti-Stokes' light and the Stokes' light to the first output port and the second output port in a first switching position and transmitting the Stokes' light and the anti-Stokes' light to the first output port and the second output port in a second switching position.

摘要翻译： 一种用于测量沿着光纤的温度分布的装置，包括用于将脉冲光输入到光纤中的光源，用于从光纤接收反向拉曼散射光并提取反斯托克斯光和斯托克斯光的滤光器， 光，用于衰减由光滤波器提取的斯托克斯光的强度的光衰减器，第一和第二信号路径，每个信号路径包括光接收元件和模数转换器，用于计算温度的信号处理器 基于第一信号路径和第二信号路径沿着光纤的分布，以及具有用于接收反斯托克斯光的第一输入端口的光开关，用于接收斯托克斯光的第二输入端口，第一输出端口， 以及第二输出端口，所述光开关在第一切换位置将所述反斯托克斯光和斯托克斯光发射到所述第一输出端口和所述第二输出端口，以及 在第二切换位置将斯托克斯灯和反斯托克斯灯发射到第一输出端口和第二输出端口。

公开(公告)号：US5449233A

公开(公告)日：1995-09-12

申请号：US78751

申请日：1993-06-16

申请人： Yukio Sai ,  Hiroyuki Kaneko ,  Yuji Miyane

发明人： Yukio Sai ,  Hiroyuki Kaneko ,  Yuji Miyane

IPC分类号： G01K11/32

CPC分类号： G01K11/32

摘要： A temperature distribution measuring apparatus, which inputs pulsed-light into an optical fiber, measures backward Raman-scattered light generated in the optical fiber, and calculates a temperature distribution along the optical fiber in accordance with the ratio of the intensity of anti-Stokes' light to the intensity of Stokes' light of the backward Raman-scattered light. The apparatus comprises an optical filter for extracting the anti-Stokes' light and Stokes' light from the backward Raman-scattered light, an optical attenuator for attenuating the Stokes' light extracted by the optical filter, an optical switch for receiving the anti-Stokes' light extracted by the optical filter and the Stokes' light output from the optical attenuator, and selectively outputting one of the anti-Stokes' flight and Stokes' light, a light-receiving element for detecting the intensity of the light output from the optical switch, an amplifier for amplifying an analog electrical signal produced by the light-receiving element, an amplified analog-to-digital converter for converting the analog electrical signal into a digital signal, and a signal processor for measuring the temperature distribution along the optical fiber by processing the digital signal.

摘要翻译： 将脉冲光输入到光纤中的温度分布测量装置测量在光纤中产生的向后的拉曼散射光，并且根据反斯托克斯的强度的比率计算沿着光纤的温度分布。 照亮到反射拉曼散射光的斯托克斯光的强度。 该装置包括用于从后向拉曼散射光中提取反斯托克斯光和斯托克斯光的光学滤波器，用于衰减由滤光器提取的斯托克斯光的光衰减器，用于接收反斯托克斯 通过光学滤波器提取的光和从光衰减器输出的斯托克斯光，并且选择性地输出反斯托克斯飞行和斯托克斯光中的一个;光接收元件，用于检测从光学器件输出的光的强度 开关，用于放大由光接收元件产生的模拟电信号的放大器，用于将模拟电信号转换为数字信号的放大模数转换器，以及用于测量沿着光纤的温度分布的信号处理器 通过处理数字信号。

公开(公告)号：US5880376A

公开(公告)日：1999-03-09

申请号：US937595

申请日：1997-09-29

申请人： Yukio Sai ,  Yousuke Kubota

发明人： Yukio Sai ,  Yousuke Kubota

IPC分类号： G01F1/00 ,  G01F1/58 ,  G01F1/60 ,  G01F1/56

CPC分类号： G01F1/588 ,  G01F1/002 ,  G01F1/584 ,  G01F1/586 ,  G01F1/60

摘要： An electromagnetic flowmeter generates a magnetic filed perpendicular to a ring earth electrode contacting fluid at an end portion of a measuring tube and a point electrode attached to a lower portion of the measuring tube so as to measure a flow rate without depending on a fluid level. The electromagnetic flowmeter comprises magnetic field generation means for generating the magnetic field in the measuring tube to be perpendicular to an axial direction of the measuring tube such that electromotive force generated in fluid is not influenced by the fluid level, flow rate output means for calculating a flow rate of fluid flowing in the measuring tube based on a potential developed in the fluid by said magnetic filed generated by the magnetic field generation means so as to output the calculated flow rate, and display means for displaying the flow rate calculated by the flow rate calculation means.

摘要翻译： 电磁流量计产生垂直于测量管的端部处的环形接地电极接触流体的磁场和附接到测量管的下部的点电极，以便不依赖于液位而测量流量。 电磁流量计包括磁场产生装置，用于在测量管中产生垂直于测量管的轴向的磁场，使得在流体中产生的电动势不受流体水平的影响，流量输出装置用于计算流量 基于由磁场产生装置产生的所述磁场在流体中产生的电位，流体流过测量管中的流体，以输出计算出的流量;以及显示装置，用于显示由流量计算出的流量 计算方法。

公开(公告)号：US5099144A

公开(公告)日：1992-03-24

申请号：US458803

申请日：1989-12-28

申请人： Yukio Sai

发明人： Yukio Sai

IPC分类号： H02J17/00

CPC分类号： H02J17/00

摘要： An apparatus for optical power transmission capable of reducing a number of photo cells and improving a power transmission efficiency, and an optically powered system using the apparatus capable of maximizing lifetime of light sources. The apparatus includes an alternating current transformer for transforming the electric power to a desired level for a load. The system further includes a device for detecting magnitude of the electric power, and a device for controlling an amount of light emission by the light source in accordance with the detected magnitude of the electric power such that the magnitude of the electric power to be given to the load is maintained to be substantially constant.

摘要翻译： 一种能够减少光电池数量并提高电力传输效率的光功率传输装置，以及使用能够使光源寿命最大化的装置的光学系统。 该装置包括用于将电力转换到用于负载的期望水平的交流电流互感器。 该系统还包括用于检测电力的大小的装置，以及用于根据检测到的电力的大小来控制光源的发光量的装置，使得给予的电力的大小 负载保持基本恒定。

公开(公告)号：US5825804A

公开(公告)日：1998-10-20

申请号：US813980

申请日：1997-03-10

申请人： Yukio Sai

发明人： Yukio Sai

IPC分类号： G01J3/45 ,  G01K11/00 ,  G01K11/32 ,  G01K3/06

CPC分类号： G01K11/32 ,  G01K2007/166

摘要： A temperature distribution measuring apparatus and related method uses optical time domain reflectometry to determine temperature distribution along an optical fiber. A light pulse enters the fiber at one end, and backscattered light at each of various points in the optical fiber has a Raman spectrum which contains temperature information. An impulse response to the Raman spectra of backscattered light is produced using a transformation to provide a temperature distribution along the optical fiber. An impulse response on the anti-Stokes component and an impulse response of the Stokes component of the Raman spectrum are each produced, and the ratio between them indicates temperature distribution. Each impulse response is obtained by performing deconvolution on the Stokes component and the anti-Stokes component using an inverse matrix of measured incident light, the inverse matrix being obtained by an iteration method with an optimum number of iterations.

摘要翻译： 温度分布测量装置及相关方法使用光时域反射测定来确定沿着光纤的温度分布。 光脉冲在一端进入光纤，光纤中的各个点的各个点的后向散射光具有含有温度信息的拉曼光谱。 使用转换来产生沿着光纤的温度分布的反向散射光的拉曼光谱的脉冲响应。 分别产生反斯托克斯分量的脉冲响应和拉曼光谱的斯托克斯分量的脉冲响应，它们之间的比率表示温度分布。 通过使用测量的入射光的逆矩阵对斯托克斯分量和反斯托克斯分量进行去卷积获得每个脉冲响应，逆矩阵通过具有最佳迭代次数的迭代方法获得。

公开(公告)号：US5272334A

公开(公告)日：1993-12-21

申请号：US961177

申请日：1992-10-16

申请人： Yukio Sai

发明人： Yukio Sai

IPC分类号： G01K11/32 ,  H01J5/16

CPC分类号： G01K11/32

摘要： An apparatus for measuring temperature along an optical fiber uses backscattered light and optical time domain reflectometry to obtain a measure of the temperature distribution along the fiber. The ratio of anti-Stokes Raman to Stokes Raman backscattered light is used to determine the temperature distribution. In order to compensate for fluctuations in the wavelength of a laser source there is provided in a first embodiment an optical filter which passes Fresnel components of the light reflected from a distal end of the fiber. Changes in the ratio of the filtered Fresnel components correspond to changes in the source wavelength which may then be compensated by adjusting the source wavelength. In a second embodiment, the optical filter is used to measure the ratio of anti-Stokes Raman and Stokes Raman backscattered components derived from a reference temperature section of the fiber in which the temperature is held constant. Variations in this ratio result from source fluctuations which may again be compensated so as to maintain the laser source at a substantially constant output frequency thus permitting more accurate measurement of the temperature distributed along the fiber.

摘要翻译： 用于沿着光纤测量温度的装置使用反向散射光和光学时域反射测量法来获得沿着光纤的温度分布的测量。 反斯托克斯拉曼与斯托克斯拉曼反向散射光的比值用于确定温度分布。 为了补偿激光源的波长波动，在第一实施例中提供了一种滤光器，其使从光纤的远端反射的光的菲涅尔分量通过。 滤波的菲涅尔分量的比率变化对应于源波长的变化，然后可以通过调节源波长来补偿。 在第二实施例中，光学滤波器用于测量由温度保持恒定的纤维的参考温度部分导出的反斯托克斯拉曼和斯托克斯拉曼反向散射分量的比率。 该比率的变化由源波动产生，其可以再次被补偿，以便将激光源保持在基本上恒定的输出频率，从而允许更准确地测量沿着光纤分布的温度。

公开(公告)号：US4607162A

公开(公告)日：1986-08-19

申请号：US531086

申请日：1983-09-12

申请人： Yukio Sai

发明人： Yukio Sai

IPC分类号： G01B11/00 ,  G01D5/26 ,  G01D5/30 ,  G01D5/347 ,  G01D5/353 ,  G01D5/38 ,  G02B6/28 ,  G02B27/00 ,  G08C23/04 ,  G08C25/00 ,  H01J5/16 ,  H01J3/14 ,  H01J40/14

CPC分类号： G01D5/268

摘要： According to the instant invention, two input light transmitting lines or paths are used which transmit the wavelength input light of the same wavelength. A detecting portion modulates the two inputs according to the physical quantity to be measured and produces separate outputs along two output transmitting paths. A processing portion processes the two outputs and calculates the physical quantity to be measured.In the detecting portion, each of the inputs is split into two separate light signals each of which varies at a different rate due to the effects of the physical quantity. The two separated light signals follow a respective output transmitting paths. As a result, two output signals are produced along the output paths for each input light applied to the detecting portion. The processing portion calculates one intensity ratio corresponding to the ratio of the two output signals when one input light is supplied, and calculates another intensity ratio corresponding to the ratio of two output signals when the other input light is supplied. These intensity ratios are multiplied and the physical quantity is then calculated based on the resulting multiplied value.

摘要翻译： 根据本发明，使用传输相同波长的波长输入光的两个输入光传输线或路径。 检测部根据被测量的物理量对两个输入进行调制，并沿着两个输出发送路径产生分离的输出。 处理部分处理两个输出并计算要测量的物理量。 在检测部分中，每个输入被分成两个单独的光信号，每个光信号由于物理量的影响以不同的速率变化。 两个分离的光信号遵循相应的输出传输路径。 结果，对于施加到检测部分的每个输入光，沿着输出路径产生两个输出信号。 当提供一个输入光时，处理部分计算与两个输出信号的比率对应的一个强度比，并且当提供另一个输入光时，计算与两个输出信号的比率相对应的另一个强度比。 将这些强度比相乘，然后基于所得到的乘积值来计算物理量。

公开(公告)号：US5765948A

公开(公告)日：1998-06-16

申请号：US606797

申请日：1996-02-26

申请人： Yukio Sai

发明人： Yukio Sai

IPC分类号： G01K11/12 ,  G01K11/32 ,  G01N21/65 ,  G02B6/00

CPC分类号： G01K11/32

摘要： In a light-temperature distribution sensor, Raman scattering light is extracted from back scattering light produced by a light pulse supplied into an optical fiber, thereby calculating a temperature distribution. An intensity distribution signal of anti-Stokes Raman scattering light is extracted from the back scattering light. An intensity distribution signal of Stokes Raman scattering light is extracted from the back scattering light. An intensity distribution signal of Rayleigh scattering light is extracted from the back scattering light. The intensity distribution signal of the anti-Stokes Raman scattering light and the intensity distribution signal of the Stokes Raman scattering light are normalized, with the intensity distribution signal of the Rayleigh scattering light used as reference signal. A temperature distribution on the light transmission medium is calculated on the basis of the value of a product of the normalized intensity distribution signals of the anti-Stokes Raman scattering light and the Stokes Raman scattering light.

摘要翻译： 在光温度分布传感器中，从由提供给光纤的光脉冲产生的背散射光中提取拉曼散射光，从而计算温度分布。 从反向散射光中提取反斯托克斯拉曼散射光的强度分布信号。 从背散射光中提取斯托克斯拉曼散射光的强度分布信号。 从背散射光中提取瑞利散射光的强度分布信号。 反射斯托克斯拉曼散射光的强度分布信号和斯托克斯拉曼散射光的强度分布信号用瑞利散射光的强度分布信号作为参考信号进行归一化。 基于反斯托克斯拉曼散射光和斯托克斯拉曼散射光的归一化强度分布信号的乘积值计算光传输介质上的温度分布。

公开(公告)号：US5639162A

公开(公告)日：1997-06-17

申请号：US528594

申请日：1995-09-15

申请人： Yukio Sai

发明人： Yukio Sai

IPC分类号： G01J3/45 ,  G01K11/00 ,  G01K11/32 ,  G01K3/06

CPC分类号： G01K11/32 ,  G01K2007/166

摘要： In a temperature distribution measuring apparatus which projects pulsed-light into an optical fiber, measures Raman spectrum of backscattered light occurred in the optical fiber, and obtains a temperature distribution along the optical fiber, to improve the positional resolution, it is necessary to narrow the width of the incident pulsed-light. A response of the backscattered light to a pulsed-light of a finite width is considered to be convolution and deconvolution of the measured value of the backscattered light is performed to obtain an impulse response. Deconvolution which is an inverse transform requires a waveform of the incident light and which is previously measured. When deconvolution is performed by using an inverse matrix of the incident light, it is necessary to calculate the inverse matrix by means of an iteration method. An optimum number of iterations of the iteration method is determined such that an error of a measured value for a known temperature used as an evaluation function is minimum or a result of deconvolution on Fresnel reflected light shows a linear waveform.

摘要翻译： 在将脉冲光投射到光纤中的温度分布测量装置中，测量光纤中发生的背散射光的拉曼光谱，并且获得沿着光纤的温度分布，以提高位置分辨率，有必要缩小 入射脉冲光的宽度。 后向散射光对有限宽度的脉冲光的响应被认为是卷积，并且执行反向散射光的测量值的去卷积以获得脉冲响应。 作为逆变换的解卷积需要入射光的波形，并且预先测量。 当通过使用入射光的逆矩阵进行去卷积时，需要通过迭代方法计算逆矩阵。 确定迭代方法的最佳迭代次数，使得用作评估函数的已知温度的测量值的误差最小，或者对菲涅尔反射光进行去卷积的结果显示线性波形。