针对耐高温准分布式光纤布拉格光栅（FBG）传感器的需求，利用飞秒激光相位掩模辐照结合光纤拉伸，研究出制备不同周期的布拉格光栅的方法。通过改变光纤两端施加应力的大小来控制FBG的周期，得到具有不同布拉格波长的FBG并构成准分布式高温传感器。标定了FBG的温度响应参数，实现了两点准分布式温度测量。准分布式传感系统由光纤光栅解调仪和串接在一起的不同布拉格波长的FBG构成。不同温度下FBG的光谱响应结果表明：FBG的布拉格波长对温度响应曲线有很好的线性拟合相关度，在800 ℃长时间退火后FBG反射率稳定在-10.2 dB，该传感系统可用于800 ℃以内的温度传感测量。

According to the requirement of quasi-distributed high temperature sensor based on fiber Bragg grating (FBG), preparation method of the FBGs with different periods is studied by using the femtosecond laser phase mask combined with fiber pulling. Periods of the FBGs are controlled by changing the stress applied to the fiber during femtosecond laser irradiation, then the quasi-distributed high temperature sensor based on the FBGs with different Bragg wavelengths is obtained. Temperature response parameter of the FBG is demonstrated, and two points quasi-distributed temperature measurement is achieved. The quasi-distributed sensor system is consist of the FBG demodulation instrument and FBGs with different Bragg wavelengths. Measured results of the FBG spectra under different temperatures indicate that the Bragg wavelength of the FBG is shifted linearly as the temperature increases. Reflectivity of the FBG keeps at -10.2 dB after annealing for a long time at 800 ℃. This FBG sensor system can be applicable to sensing measurement within 800 ℃.