Aiming at the difficult problem of large strain health monitoring of space rocket fuel tank under ultra-low temperature environment,a double ring desensitized type ultra-low temperature strain sensor based on fiber Bragg grating(FBG)is proposed. In the experiment,the low-temperature glue is used for packaging,and the strain of the sensor is tested at room temperature in liquid nitrogen enironment. In the measuring range of (0～490)× 10-6,the strain sensitivity of the sensor is 0.18 pm/10-6 and 0.67 pm/10-6,respectively,and the desensitization ratio is 2.68. The designed sensor has good strain desensitization characteristics under ultra-low temperature environment.
关键词
光纤传感器/光纤光栅/超低温/应变减敏/有限元分析
Key words
optical fiber sensor/fiber grating/ultra-low temperature/strain desensitization/finite element analysis
维普
万方数据