为了提高光纤激光器的温度灵敏度和数据完整性，提出了一种基于拍频解调的光纤激光温度传感系统。利用光纤激光谐振腔中的光纤布拉格光栅（FBG）进行温度传感，将FBG的波长变化依次转变为谐振腔内的波长变化和光纤激光器拍频信号的频移变化，大幅提高了系统的灵敏度。通过Python程序实现秒级数据自动采集及保存，提高了工作效率。用矩形框中心点位置法代替直接寻峰值法对温度信号进行解调，可避免频率抖动较大引起的误差。相比光学解调技术，该系统利用成熟的电学解调技术解调，无需昂贵的波长解调仪，降低了解调成本。实验结果表明，该系统具有较高的灵敏度和测量精度，平均灵敏度为74.087 kHz/℃，测量精度为0.47×10^-3 ℃。

To improve the temperature sensitivity and data integrity of the fiber laser, a fiber laser temperature sensing system based on beat frequency demodulation is proposed. The fiber Bragg grating (FBG) in the fiber laser resonator is used for temperature sensing. The wavelength change of FBG is successively transformed into the wavelength change of the resonator and the frequency shift of the fiber laser beat frequency signal, which greatly improves the sensitivity of the system. The Python program is used to realize the second-time data automatic collection and saving, thus improving the working efficiency. The error caused by large frequency jitter can be avoided by demodulating the temperature signal through the rectangular frame center position method instead of direct peak value finding method. Compared with optical demodulation technology, the system uses mature electrical demodulation technology to demodulate instead of expensive wavelength demodulation instrument, reducing the cost of modulation. The experimental results show that the system has high sensitivity and measurement accuracy. The average sensitivity of the system is 74.087 kHz/℃. The measurement accuracy of the system is 0.47×10^-3 ℃.