Fiber optic temperature sensor is a sensing device, the use of part of the absorption of the spectrum of material changes with the principle of temperature changes, analyze the spectrum of optical fiber transmission to understand the real-time temperature, the main materials are optical fibers, spectral analyzers, transparent crystals, etc., is divided into distributed, optical fiber fluorescence temperature sensor.

Fiber optic temperature sensor is a type of sensor that uses the principle that the amplitude, phase, frequency, polarization state of light changes with the temperature of the optical fiber when the light is transmitted in the light.

Fiber optic temperature sensors are generally divided into two categories: one is to play only the role of optical fiber transmission of light, must be installed in the optical fiber end of other sensitive components in order to constitute a new type of sensor transmission sensors; the other is the use of optical fiber itself has a certain sensitive function and the role of optical fiber to measure the temperature, is a functional, optical fiber both sensing information, and transmission of information.

Fiber optic temperature sensors since its introduction, mainly used in power systems, construction, chemical, aerospace, medical and even marine development, and has achieved a large number of reliable application performance.

In the past, we have also shared our experience in the fields of geophysics and bridge engineering, and in the following, we will take a look at the applications of fiber optic temperature sensors in other fields.

1, fiber optic temperature sensor has important applications in the power system, the surface temperature of power cables and temperature monitoring in cable-dense areas; monitoring of high-voltage power distribution devices in areas prone to heat; power plants, substations, environmental temperature detection and fire alarm system; all kinds of large and medium-sized generators, transformers, motor temperature distribution measurement, thermal protection and fault diagnosis. Temperature and fault point detection of heating systems, steam pipelines and oil pipelines in thermal power plants; equipment temperature monitoring in geothermal power stations and indoor enclosed substations, etc.

2, fiber optic temperature sensing, especially fiber optic grating temperature sensor is easy to be buried in the material to the internal temperature of the high resolution and wide range of measurement, which is widely used in construction, bridges. The United States, the United Kingdom, Japan, Canada and Germany and other developed countries have long carried out bridge safety monitoring research, and in the main bridge are installed on the bridge safety monitoring early warning system, used to monitor the bridge strain, temperature speed, displacement and other key safety indicators. 1999 summer, the United States New Mexico Las Cruces No. 10 interstate highway, a steel structure, and the bridge is used to monitor the strain, temperature, speed, displacement and other key safety indicators. 120 fiber-optic grating temperature sensors were installed on the bridge, setting a record for the most such sensors on a single bridge.

3, the aerospace industry is a sensor-intensive place, a vehicle in order to monitor the pressure, temperature, vibration, fuel level, landing gear status, the position of the wings and rudder, etc., the need to use more than 100 sensors, so the size and weight of the sensor becomes very important. Fibre optic sensors are almost unmatched by other sensors in terms of their small size and light weight.

Few other sensors are comparable in size and weight.

4. The small size of the sensor makes a lot of sense in medical applications, and the optical fiber grating sensor is the smallest sensor available today. The Fibre Grating sensor is capable of making internal measurements of human tissue function with minimal invasion, providing precise local information about temperature, pressure, and acoustic fields. The technology of fiber-optic grating sensors on human tissue is quite extensive. Research on fiber optic temperature sensors accounts for nearly 20% of all fiber optic sensor research.

The optical fiber temperature sensor represents nearly 20% of all fiber optic sensor research.

Fiber optic temperature sensor research, in addition to the existing devices to verify, improve and improve the field, there are currently the following developments: vigorously develop the measurement technology to measure the temperature distribution, that is, from the temperature measurement of a single point to the temperature distribution along the fiber, as well as the temperature distribution of a large area of the surface measurement; development of multi-functional sensors, including temperature measurement; research and development of Large sensor array for all-optical telemetry.