EFPI-FBG复合光纤传感器高温大应变试验研究

Due to the lack of effective detection technology and devices for blade temperature and strain in the aero-engine or gas turbine service environment, the shortage of key data such as the temperature environment, load environment and strain distribution of the working blade was one of the biggest difficulties in troubleshooting.Using extrinsic Fabry-Perot interferometric and fiber bragg grating sensing technologies, a single-mode fiber-based EFPI-FBG composite optic fiber sensor and its demodulation equipment were developed.By building a high temperature tensile test platform, the performance tests of composite fiber sensor based on a specimen with DZ125 material were carried out under high temperature and large strain. The test results show that the working temperature range of the composite optic fiber sensor is 26 ℃ to 1 100 ℃, the accuracy of temperature measurement shall not exceed 5% of full scale and the resolution is 0.066 ℃; the strain measurement range of F-P sensor is 0 to 19 468 με, the relative error is 1.96% and the resolution is 0.053 με at 1 100 ℃.