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根据大型结构全尺度分布式高精度温度测量要求,组合应用布里渊时域分析(BOTDA)技术和光纤布拉格光栅(FBG)温度传感技术,设计了一种由BOTDA分析仪、FBG解调仪、共线传感探头和光开关组成的温度传感测试系统。实验测试证明,该系统具备大范围分布式温度测量与局部高精度温度测量功能,而且实现了BOTDA测温技术与FBG温度传感技术的有效互补,解决了测量范围和测量精度的矛盾问题,并且具有良好的温度重复性,达到了预期的设计要求。该共线测试技术方案在大规模结构温度监测中具有广阔的应用前景。
According to the requirements of full-scale distributed high-precision temperature measurement of large scale structures, a combination of BOTDA and FBG temperature sensing technology is used in combination with Brillouin time-domain analysis (BOTDA) and FBG demodulator , Collinear sensor probe and optical switch composed of temperature sensing test system. Experimental tests show that the system has a wide range of distributed temperature measurement and local high-precision temperature measurement functions, but also realize the BOTDA temperature measurement technology and FBG temperature sensing technology effectively complement each other to solve the contradiction between measurement range and measurement accuracy, and Has a good temperature repeatability, to meet the expected design requirements. The collinear testing technology scheme has broad application prospect in large-scale structure temperature monitoring.