cncnA contactless high temperature in-situ sensing system based on fiber Bragg grating(FBG) is proposed to implement accurate temperature measurements of bearing bushing, which is the core component of reciprocating compressor(RC). The system consists of a sensing probe of a FBG putting in a metal capillary to eliminate the cross-sensitivity problem and a pair of optical fiber collimators to send the original optical signal and collect the reflected sensing modulation signal. Considering the intermittent variation of FBG reflection spectrum transmitted by optical fiber collimators with reciprocating relative motion, a demodulation algorithm of wireless FBG signal is proposed and implemented. The experimental results show that the in-situ FBG sensing system has good temperature measurement performance in the range of 10–350 °C, the sensitivity is 9.49pm/°C, and the linearity is more than 99.93%

提出了一种基于光纤布拉格光栅（FBG）的非接触式高温原位传感系统，以实现轴承衬套温度的准确测量，该轴承衬套是往复式压缩机（RC）的核心部件。该系统包括一个FBG传感探头，该传感探头放在金属毛细管中以消除交叉灵敏度问题，以及一对光纤准直仪，用于发送原始光信号并收集反射的传感调制信号。考虑到光纤准直器传输的FBG反射频谱具有间歇性的相对运动的间歇性变化，提出并实现了无线FBG信号的解调算法。实验结果表明，原位FBG传感系统在10–350°C的范围内具有良好的温度测量性能，灵敏度为9。