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。 An external cavity fiber Fabry-Perot interference type (EFPI) high temperature strain sensor is introduced. The sensor is composed of a hollow optical fiber welded between two flattened single-mode fibers. Experiments show that the sensor can work stably under 1000 ℃, the sensitivity of cavity length variation is 0.17nm / με, the strain measurement sensitivity can reach ± ​​1με and the linearity is up to 0.99998. EFPI high temperature strain sensor compact, simple process, low cost, is a reliable, excellent high temperature strain sensor.