Application of high-temperature optical fiber sensor in temperature and strain testing of hot structure

The application technology of quartz optical fiber sensor in the real-life high-temperature environment was studied. Based on studies of various adhesives agents and manufacturing techniques, the test provides connecting method for ultra-high-temperature ceramic structure at 700°C situation, and specifies adhesive agent and adhesive technique related to the process. The ceramic structure was evaluated at 700°C, and signals reflecting from sensors at different locations and different temperatures were examined. The results show that, at high-temperature situation, wavelength change caused by structural thermal strain and by structure strain demonstrates approximate linearity, the strain sensitivity coefficient is 0.001 26 nm/με. The test realizes the concurrent monitoring of structural temperature and strain at high-temperature environment using only one sensor, which provides a new way for hot structure health monitoring in high-temperature environment.