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建立了光子晶体光纤(PCF)型本征法布里-珀罗(F-P)腔光纤压力传感器压力响应理论模型,讨论了各参数对压力响应灵敏度的影响,给出了Matlab程序理论模拟结果。鉴于PCF焊接工艺的困难,提出了利用外径不同的单多模光纤熔接构成的改进型单多模光纤复合本征F-P腔光纤压力传感器结构,建立了压力响应理论模型,分析了提高压力响应灵敏度的关键参数,并模拟了光纤外径对压力响应灵敏度的影响。通过对两种本征F-P腔光纤压力传感器的比较分析看出,改进型结构无论在压力响应灵敏度还是制作难易度方面都颇具优势。
The pressure response theoretical model of PCF intrinsic Fabry-Perot fiber optic pressure sensor was established. The influence of various parameters on the sensitivity of pressure response was discussed. The theoretical simulation results of Matlab program were given. In view of the difficulty of PCF welding process, a new single-mode multi-mode optical fiber composite intrinsic FP cavity optical fiber pressure sensor structure based on single-mode multi-mode fiber with different outer diameters is proposed. Theoretical model of pressure response is established. Of the key parameters, and simulate the optical fiber diameter on the pressure response sensitivity. Through the comparative analysis of two intrinsic F-P cavity optical fiber pressure sensors, it can be seen that the improved structure has advantages both in pressure response sensitivity and manufacturing ease.