What fields can fiber optic sensors be used for temperature measurement

In the power system, it is necessary to measure parameters such as temperature and current, such as temperature detection in the stator and rotor of high-voltage transformers and large motors. Due to the susceptibility of electrical sensors to electromagnetic interference, they cannot be used in such situations and can only be used with fiber optic sensors. Fluorescent fiber optic sensors can be used for precise temperature measurement in the power cable industry, such as transformer temperature measurement in substations, switchgear temperature measurement in distribution cabinets, laboratory instruments, and medical temperature measurement.

Temperature measurement characteristics of distributed fiber optic temperature sensors

DTS distributed fiber optic sensor is a high-tech technology developed in recent years for real-time measurement of spatial temperature field distribution. The distributed fiber optic temperature sensing system not only has the advantages of universal fiber optic sensors, but also has the ability to sense the distribution of temperature at various points along the fiber optic line. The distributed fiber optic temperature measurement system independently developed by FJINNO can continuously measure the temperature at various points along the fiber optic line in real time, with a positioning accuracy of up to meters and a measurement accuracy of up to 1 degree, making it very suitable for large-scale intersection temperature measurement applications.

The application of fiber optic sensor technology in the field of temperature measurement

Fiber optic sensing technology is a new sensing technology that has accompanied the development of optical fibers and fiber optic communication technology. It is the fastest growing high-tech application technology in the world in decades. There are currently two main types of fiber optic sensing technology on the market, one is using fiber optic as the sensor directly, and the other is based on grating sensors. Fiber optic sensors are fundamentally different from electrical based sensors. Fiber optic sensors use light as the carrier of sensitive information and fiber optic as the medium for transmitting sensitive information, making them widely used due to their unique characteristics.

Requirements for temperature measurement equipment in switchgear:

Due to the special internal environment of switchgear equipment, it is required that the fluorescent fiber optic temperature measurement system must have the following characteristics:

1. Strong resistance to electromagnetic environment

2. Real time temperature monitoring

3. Strong work stability and long service life

4. Strong backend processing capabilities, able to predict current temperature trends, provide early warning, and prevent accidents from occurring.

 

Advantages of fiber optic temperature sensor temperature measurement system in high-voltage switchgear temperature measurement:

1. The fluorescent fiber is a quartz fiber with good insulation properties.

2. The fiber optic conducts optical signals and is not affected by strong electromagnetic interference.

3. Long transmission distance makes it easy for signals to aggregate and form a network.

4. The sensor and processor are separated, achieving secondary isolation and eliminating potential accidents such as electric shock.

The characteristics of fiber optic temperature measurement technology

Fiber optic temperature measurement is a new technology that has only recently developed and has gradually shown some excellent characteristics, such as being free from electromagnetic interference and resistant to corrosion; Passive real-time monitoring, electrical insulation, and good explosion-proof performance; Small size, light weight, and can be bent; High sensitivity and long service life; Long transmission distance and convenient maintenance. In some special application environments, it is necessary to quickly measure the instantaneous temperature situation, such as the temperature rise of explosives and chips. Generally, fiber optic temperature sensors have a slow response time, requiring 0.5 seconds or longer. When explosives or chip temperature rise occur, the temperature rise is very rapid. Therefore, there is an urgent need for a sensor that can quickly detect temperature.

The traditional temperature measurement method usually measures the temperature of the excitation equipment at a specific time during inspection, which cannot achieve real-time monitoring, and some parts cannot be monitored. Monitoring after the equipment is shut down is meaningless. Alternatively, real-time temperature measurement has only been used for individual parts, and there is currently no application for comprehensive real-time temperature monitoring and fault diagnosis of multiple key parts of excitation equipment.