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Fiber-optic Sagnac interferometer for noncontact structural monitoring in power plant applications

机译:Sagnac光纤干涉仪,用于电厂应用中的非接触式结构监测

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The design of a noncontact fiber-optic sensor is described for the detection of acoustic emission for structural integrity monitoring in high-temperature power plant applications. The sensor is based on a Sagnac interferometer and produces an output proportional to target velocity, without the need for active phase stabilization. It is inherently insensitive to low-frequency perturbations of the instrument or the target and incorporates an environmentally insensitive downlead, which may be of arbitrary length. It is shown that the sensor is capable of meeting the specifications for structural integrity monitoring of high-temperature power plant components based on acoustic emission detection and has a velocity resolution of 50 nm s(-1) Hz(-1/2). (C) 1997 Optical Society America
机译:描述了一种用于检测声发射的非接触式光纤传感器的设计,以用于高温电厂应用中的结构完整性监控。该传感器基于Sagnac干涉仪,可产生与目标速度成比例的输出,而无需有源相位稳定。它固有地对仪器或目标的低频扰动不敏感,并且并入了对环境不敏感的下行引线,该引线可以是任意长度。结果表明,该传感器能够满足基于声发射检测的高温发电厂组件结构完整性监控的规范,其速度分辨率为50 nm s(-1)Hz(-1/2)。 (C)1997美国眼镜学会

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