This sensor is a general-purpose temperature sensor that monitors temperature changes by using the unique temperature-sensitive performance of the grating. It has small size, fast response, high stability and high precision, and is convenient for multi-point monitoring of the network. The monitoring is easy to install and can be surface mounted, or it can be buried in the structure to be tested to monitor the internal temperature of the structure. Suitable for long-term temperature monitoring of power stations, railways and oil tanks, as well as temperature measurement in the fields of electricity, military, aerospace and other fields.