长周期光纤光栅的谐振波长与温度的变化基本呈线性关系，线性拟合的标准差可以表示长周期光纤光栅损耗峰对应波长的波动性。提出了一种初步衡量长周期光纤光栅的温度传感性能优劣的方法，即用长周期光纤光栅温度灵敏度与拟合标准差的比值P的大小来判断长周期光纤光栅的温度传感性能优劣。大量的实验数据证明，长周期光纤光栅温度传感特性的优劣与参数P的大小是一致的，即P值越大则长周期光纤光栅的温度传感特性越好，P值越小则长周期光纤光栅的温度传感特性越差。

Resonance wavelength of long period fiber grating basically has a linear relation with the temperature changes, and the volatility of the wavelength corresponding to the loss peak can be represented by the standard deviation of the linear fitting. A new method for temperature sensing performance evaluation of long period fiber grating (LPFG) is proposed. The method is to use the ratio of the temperature sensitivity to the fitting standard deviation, P, to measure the sensing properties of LPFG. Lot of experimental results show that temperature sensitivity has a good consistence with the P value. The greater the P value is, the better the temperature sensing property of LPFG is, and the smaller the P value is, the poor the property is.