In recent years, sensors are developing in the direction of accuracy, sensitivity, adaptability, compactness and intelligence. In this process, the emerging industry of optical fiber sensors has attracted much attention. Optical fiber sensor is gradually formed with the development of optical communication technology. It is a sensor that converts external measured parameters (temperature, pressure, displacement, electromagnetic field, etc.) into characteristic parameters (amplitude, phase, wavelength, polarization state) of optical fiber transmission light wave.

In the field of optical fiber sensors, there are many researches and applications of sensing optical fiber temperature sensors, accounting for about 20% of the total. It has the inherent advantages of optical fiber sensor. In addition to temperature measurement in some traditional fields, it can also be used in some special fields, such as high temperature and high pressure, flammable and explosive, strong electromagnetic interference and places with strong chemical corrosion. Therefore, it has a great market demand. Now let's take a look at the application of optical fiber temperature sensor in production practice.

In scientific research and production practice, accurate temperature detection and control is very important, and optical fiber temperature sensor is a very important member of the optical fiber sensor family. Optical fiber temperature sensor is a principle sensing device that uses the spectrum absorbed by some substances to change with temperature. Since its birth, optical fiber temperature sensors have been mainly used in power system, construction, chemical industry, medical treatment and ocean development, and have achieved a lot of reliable application achievements.

Hangkong Tianye is a place where sensors are used intensively. An aircraft needs to use more than 100 sensors to monitor pressure, temperature, vibration, fuel level, landing gear status, wing and rudder position, etc., so the size and weight of sensors become important. From the advantages of small size and light weight, optical fiber sensors can hardly be compared with other sensors.

Some developed countries such as the United States, Britain, Japan, Canada and Germany have long carried out research on bridge monitoring, and have installed bridge monitoring and early warning systems on major bridges to monitor key indicators such as bridge strain, temperature acceleration and displacement. In the summer of 1999, 120 FBG temperature sensors were installed on a steel structure bridge of Interstate Las Cruces 10 in New Mexico, USA, creating many records of using such sensors on a single bridge. In this way, the temperature inside the building can be measured in a large range and with high accuracy by using optical fiber sensors to achieve safety detection and early warning of the building. The Canadian FISO optical fiber temperature sensor FOT-L-SD provided by Industrial Production Network is a kind of optical fiber temperature sensor that is very suitable for measuring temperature in harsh environment, including low temperature, microwave and high strength RF.