光纤光栅与法珀微腔温度应变双参量传感器

针对光纤应变传感器的温度-应变交叉敏感性问题,研究了一种结合光纤布拉格光栅(FBG)与法布里-珀罗(FP)微腔的光纤FBG-FP混合型温度应变双参量传感器.该传感器由两根垂直切割的单模光纤穿入一段石英毛细管(Glass capillary),并在石英毛细管两端固定制成,其中一根光纤端面附近预刻FBG,两根光纤端面间距为...

A fiber grating and Fabry-Perot microcavity sensor for temperature and strain measurement

To solve the problem of temperature-strain cross-sensitivity in fiber-optic strain sensors,a fiber Bragg grating(FBG)-Fabry-Perot(FP)hybrid temperature and strain dual-parameter sensor is investigated.The sensor is made of two vertically cut single-mode optical fibers penetrated into a section of fused silica capillary and fixed at its two ends.One of the single mode fibers is pre-inscribed with a FBG near the fiber facet,and fiber facets separation is in the order of micrometers,which forms a FP microcavity.The FBG in the free state measures the temperature,and the FP microcavity measures the strain,and the temperature result from the FBG is used to compensate the influence of the temperature on the FP microcavity,thereby the temperature-strain cross-sensitivity problem in fiber-optic strain sensing can be effectively resolved.In this paper,an fiber-optic FBG-FP hybrid temperature-strain dual-parameter sensor with an initial FP cavity length of 30.6μm was successfully made.The sensitivity of the temperature and strain reached 12 pm/℃and 175.2 nm/με,respectively,and the temperature compensation for the strain measurement is successfully realized.