介绍了一种外腔式光纤Fabry-Perot干涉型(EFPI)高温应变传感器, 传感器是在两段切割平整的单模光纤之间熔接一段空心光纤构成。实验证明, 传感器在1000℃以下时能够稳定工作, 腔长变化灵敏度为0.17nm/με, 应变测量灵敏度可达±1με, 线性度高达0.99998。EFPI高温应变传感器结构紧凑, 工艺简洁, 成本低廉, 是一种可靠、优秀的高温应变传感器。

A high temperature strain sensor based on the fiber optic extrinsic Fabry-Perot interferometer(EFPI) is presented. A section of hollow capillary is spliced with two sections of cleaved single-mode fibers to form an extrinsic Fabry-Perot cavity. Experimental results show that the sensor can work stably at 1000℃. The sensitivity of the cavity length change and the strain sensitivity are 0.17nm/με and ±1με, respectively. The linearity is 0.99998. The sensor has many advantages, such as compact in construction, simple fabricating process and low cost, which is a reliable and excellent high temperature strain sensor.