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提出了一种基于光纤干涉原理的同时测量温度和应变的传感器,通过在Lyot滤波器(LFF)中熔接一段长周期光纤光栅(LPFG)构成。其中LFF由在起偏器(PL1)和检偏器(PL2)中嵌入一段保偏光纤(PMF)构成。实验结果表明,LFF的干涉谱和LPFG的谐振峰对温度和应变有不同的响应灵敏度,因此可利用敏感矩阵实现对温度和应变的同时测量。实验测得LFF和LPFG的温度灵敏度分别为-1.3173nm/℃和0.0604nm/℃,应变灵敏度分别为-0.0185nm/με和-0.0004nm/με。温度和应变的测量精度分别为±1℃和±25με。该系统采用线性结构,结构简单、易于实现,具有较高的灵敏度和稳定性,同时测量结果具有良好的线性度。
A sensor based on the theory of optical fiber interference for simultaneous measurement of temperature and strain is proposed, which is formed by fusing a long-period fiber grating (LPFG) in a Lyot filter (LFF). The LFF consists of a section of polarization maintaining fiber (PMF) embedded in the polarizer (PL1) and the analyzer (PL2). The experimental results show that the interference spectra of LFF and the resonance peak of LPFG have different response sensitivities to temperature and strain, so simultaneous measurement of temperature and strain can be achieved by using the sensitive matrix. The experimental results show that the temperature sensitivities of LFF and LPFG are -1.3173nm / ℃ and 0.0604nm / ℃, and the strain sensitivities are -0.0185nm / με and -0.0004nm / με, respectively. Temperature and strain measurement accuracy of ± 1 ℃ and ± 25με. The system uses a linear structure, the structure is simple and easy to implement, with high sensitivity and stability, while the measurement results have good linearity.