【摘要】 针对多模干涉的光纤传感器,应用柱坐标下广角光束传播法(WA-BPM)建立了其内部光场的计算模型,研究其干涉场的分布及变化规律。以基于多模干涉的光纤温度传感器为例,分析了外界温度的改变对透射谱和特征波长的影响,并进行了温度传感测试实验。模型分析所得该温度传感器的灵敏度为12.13 pm/℃,与实验得到的11.87 pm/℃基本一致。该BPM模型可以很方便地获取传感器的透射光谱,从而更便于研究波长解调方法和技术。更多还原

【Abstract】 A calculation model of light distribution in mulimode-interference based fiber-optic sensors is presented by using WA-BPM.distribution of light field in sensors and the variation regularity are obtained directly.For multimode-interference based fiber-optic temperature sensors.the impacts of the variationi of external temperatures on transmission spectra and characteristic wavelengths are analyzed,and the experiment to test the temperature sensitivity is presented.The experimental result is 11.87 pm/℃ which is in accord with the theoretical prediction of 12.13 pm/℃.This calculation model can be used to obtain the transmission spectra of fiber sensors conveniently and guide the further research of wavelength demodulation technology.更多还原