本文对Mach-Zehnder型光纤温度传感器的原理和单模光纤的温度灵敏度作了理论分析,提出一种干涉条纹移动方向的判别方法。在检测系统中实现了对干涉条纹移动量的计数。通过实验证明系统是可行的。实验结果是令人满意的。 In this paper, the principle of Mach-Zehnder optical fiber temperature sensor and the temperature sensitivity of single-mode optical fiber are theoretically analyzed, and a method to determine the moving direction of interference fringes is proposed. In the detection system to achieve the interference fringe movement counting. Experiments show that the system is feasible. The experimental results are satisfactory.