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首页> 外文期刊>Journal of Lightwave Technology >Merged Sagnac-Michelson interferometer for distributed disturbance detection
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Merged Sagnac-Michelson interferometer for distributed disturbance detection

机译：合并的Sagnac-Michelson干涉仪用于分布式干扰检测

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摘要

An interferometric technique is described to detect and locate perturbations along an optical fiber. This distributed sensor has a position dependent response to time-varying disturbances such as strain or temperature. These disturbances cause a phase shift which is detected and converted to spatial information, The sensor consists of a Sagnac interferometer merged with a Michelson interferometer. This is achieved by a frequency selective mirror in the center of the Sagnac-loop. The sensor is illuminated by two light sources with wavelengths /spl lambda//sub 1/ and /spl lambda//sub 2/, respectively. The mirror reflects /spl lambda//sub 1/ and transmits /spl lambda//sub 2/, causing the interferometer to operate as a Michelson at wavelength /spl lambda//sub 1/ and as a Sagnac at wavelength /spl lambda//sub 2/. Any time-varying perturbation on, the fiber will, result in a signal at /spl lambda//sub 2/ proportional to the product of the rate of phase change caused by the perturbation and the distance of the perturbation relative to the position of the mirror. The output of the Michelson interferometer at wavelength /spl lambda//sub 1/ is proportional to the phase change caused by the unknown perturbation. By dividing the output of the Sagnac interferometer by the time rate of change of the Michelson interferometer signal, the position of the disturbance relative to the mirror is located. Results obtained with a 200 m-distributed fiber sensor are discussed.
机译：描述了一种干涉测量技术来检测和定位沿光纤的扰动。这种分布式传感器对随时间变化的干扰（例如应变或温度）具有与位置有关的响应。这些干扰引起相移，该相移被检测并转换为空间信息。该传感器由Sagnac干涉仪与Michelson干涉仪合并而成。这是通过Sagnac回路中心的频率选择镜实现的。传感器分别由两个波长分别为/ spl lambda // sub 1 /和/ spl lambda // sub 2 /的光源照明。反射镜反射/ spl lambda // sub 1 /并透射/ spl lambda // sub 2 /，从而使干涉仪在波长/ spl lambda // sub 1 /下作为迈克尔逊工作，并在波长/ spl lambda /下作为Sagnac工作。 / sub 2 /。光纤上的任何随时间变化的扰动都会在/ spl lambda // sub 2 /处产生信号，该信号与扰动引起的相变速率和扰动距离相对于光纤位置的乘积成正比。镜子。迈克尔逊干涉仪在波长/ splλ// sub 1 /下的输出与未知扰动引起的相位变化成正比。通过将萨格纳克干涉仪的输出除以迈克尔逊干涉仪信号的时间变化率，可以确定干扰相对于反射镜的位置。讨论了使用200 m分布式光纤传感器获得的结果。

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