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从耦合模理论出发，分析了长周期光纤光栅的温度和应变灵敏度．结果表明，长周期光纤光栅的温度和应变灵敏度不仅与光栅周期和纤芯参数有关，还强烈依赖于包层参数．通过选择适当的参数，可以制成对温度（或应变）不敏感的应变（或温度）长周期光纤光栅传感器，从而可以解决光纤光栅传感器的温度和应变交叉敏感问题．同时，利用基模与不同包层模耦合时温度和应变灵敏度的不同，可以用一根长周期光纤光栅传感器同时测量温度和应变
Based on the coupled mode theory, the temperature and strain sensitivity of long period fiber gratings are analyzed. The results show that the temperature and strain sensitivity of long-period fiber gratings depend not only on grating period and core parameters, but also strongly on cladding parameters. By selecting appropriate parameters, a strain (or temperature) long-period fiber grating sensor that is insensitive to temperature (or strain) can be made to solve the problem of temperature and strain cross-sensitivity of a fiber grating sensor. At the same time, the temperature and strain sensitivity can be measured by a long-period FBG sensor by using the difference of temperature and strain sensitivity when the fundamental mode and different cladding modes are coupled.