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基于光纤布拉格光栅(FBG)高温传感特性,设计了一种基于波长调制的耐高温光纤光栅传感网络。系统设计了新型封装结构的耐高温光栅传感头。并针对传统FBG传感网络结构可靠性低的缺点,设计了一种高可靠分布式传感网络结构。采用InGaAs图像传感衍射解调技术对光反射波长进行解调。20～290℃范围测试实验表明,所设计的传感网络温度响应曲线平均线性度达0.9991,灵敏度为0.0258nm/℃,测量精度达±0.6℃,响应时间小于16s,稳定性高,适用于实际工作环境中的高温测量。
Based on the high temperature sensing characteristics of fiber Bragg grating (FBG), a fiber-optic sensing network based on wavelength modulation was designed. The system has designed a new type of high temperature grating sensor package structure. In view of the low reliability of the traditional FBG sensing network structure, a highly reliable distributed sensing network structure is designed. InGaAs image sensing diffraction demodulation technology to demodulate the light reflection wavelength. The experimental results show that the average linearity of the temperature response curve of the sensor network is 0.9991, the sensitivity is 0.0258nm / ℃, the measurement accuracy is ± 0.6 ℃, the response time is less than 16s, and the stability is high. It is suitable for practical High temperature measurement in the working environment.