基于啁啾光纤光栅的温度自补偿位移传感器

基于双三角结构的悬臂梁,提出了一种使用啁啾光纤光栅测定位移的方法.悬臂梁受到应力时引起刚性粘接在悬臂梁上的啁啾光栅反射谱带宽压缩,通过测量反射谱带宽进行位移的测量.该结构克服了位移测量时温度的交叉敏感问题,温度变化引起反射谱整体移动但不会改变带宽.测试结果表明该传感器具有较高精度、良好的线性和可重复性等优点.

Displacement Sensor with Temperature Compensation Based on Chirp Fiber Grating

A way to measure displacement with chirp fiber grating is proposed based on beam cantilever. When the strain is acting on the cantilever beam, the reflection spectrum of the chirp grating pasted on the cantilever beam is compressed and the displacement can be measured according to the bandwidth of the reflection spectrum. The structure resolves the cross sensitization of the temperature to the displacement measurement. The variation in temperature results in the displacement of the whole reflection spectrum but does not change the bandwidth. The test result shows that this sensor has high accuracy, well linearity and repeatability.