Quasi-reciprocal reflection type optical fiber temperature sensor

A disclosed quasi-reciprocal reflection type optical fiber temperature sensor is characterized by comprising an ASE light source, the ASE light source is connected with a circulator, the circulator is connected with a polarizer and a PIN photoelectric detector, the polarizer is connected with a temperature sensing unit, the PIN photoelectric detector is connected with a digital signal processor, and the digital signal processor is connected with a signal output and control interface; and a temperature sensing unit comprises a sensing optical fiber and a compensation optical fiber, the two ends of the compensation optical fiber are connected with the polarizer and the sensing optical fiber respectively, and the tail end of the sensing optical fiber is plated with a reflecting film. The temperature sensor is composed of an all-fiber structure, coating of metal materials is not needed, partial discharge does not exist, the sensitivity of the temperature sensor can be improved, the temperature sensing part is of