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光纤光栅作为一种传感单元可以测试应变、温度和压力等物理量。近年来,可用于光纤光栅信号解调的技术和仪器相继出现,并在不同的场合得到了很好的应用。但由于制造、安装和操作等原因,这些仪器的可靠性问题也开始引起不同程度的关注。仪器的可靠性分析是其设计过程中不可缺少的重要环节之一。以一种基于匹配解调技术的准分布式光纤光栅解调仪为例,介绍了该仪器的基本组成和原理;采用故障树法从机械和光电器件的可能出现的如光纤光栅脆断、螺钉松动和脱焊等故障和失效形式出发,根据光路配置、电路以及机械结构分析了可能的故障模式,计算了可靠性。结论有利于对这类仪器的故障诊断和维护。
Fiber grating as a sensing unit can test the strain, temperature and pressure and other physical quantities. In recent years, the technologies and instruments that can be used for the demodulation of fiber grating signals have appeared one after another and are well applied in different occasions. However, due to manufacturing, installation and operation, the reliability of these instruments has begun to attract different degrees of concern. The reliability analysis of the instrument is an indispensable part of the design process. A kind of quasi-distributed FBG demodulator based on matched demodulation technology is introduced as an example to introduce the basic composition and principle of the instrument. The fault tree method is used to detect the possible defects of mechanical and optoelectronic devices such as brittle fiber grating, Loosening and desoldering failure and failure forms, starting from the light path configuration, circuit and mechanical structure of the possible failure modes, calculated the reliability. Conclusion is conducive to the diagnosis of such equipment failure and maintenance.