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在光纤布拉格光栅法布里-珀罗干涉式(FBGFPI)传感器的实验研究和工业应用中,其灵敏度一直受到广泛关注。在考虑光源线宽的情况下,推导出了其灵敏度的理论表达式,讨论了光源相干长度、法布里-珀罗(F-P)腔腔长及光栅反射率对灵敏度的影响,指出腔长与光源相干长度比值越小,灵敏度越高;在腔长与光源相干长度比值一定时,存在一个最佳反射率使灵敏度达到最大。最后通过不同腔长的灵敏度对比实验和不同反射率的灵敏度对比实验,验证了理论仿真结果的正确性。
In the experimental research and industrial applications of fiber Bragg grating Fabry-Pérot interferometer (FBGFPI) sensors, the sensitivity has received much attention. The theoretical expression of sensitivity is deduced considering the line width of light source. The effects of coherence length of light source, Fabry-Perot (FP) cavity length and grating reflectance on sensitivity are discussed. It is pointed out that cavity length and The smaller the ratio of the coherence length of the light source, the higher the sensitivity. When the ratio of the length of the cavity to the length of the light source is constant, there is an optimal reflectance to maximize the sensitivity. Finally, through the contrast experiment of different cavity length sensitivity and contrast experiment of different reflectivity, the correctness of theoretical simulation results is verified.