Study on double-ring desensitized type ultra-low temperature strain sensor based on FBG
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.
optical fiber sensorfiber gratingultra-low temperaturestrain desensitizationfinite element analysis
万方数据
维普
