Distributed temperature measurement system based on optical fiber radiation attenuation temperature dependency

Abstract

The invention discloses a distributed temperature measurement system based on optical fiber radiation attenuation temperature dependency. The system comprises a light source, a coupler, a sensitive optical fiber, a photoelectric detector, a drive circuit, a detection circuit and a computer, the drive circuit drives the light source, the light source emits pulsed light, the pulsed light enters into the coupler, an output optical fiber of the coupler is connected with the sensitive optical fiber, backscattering and reflected light signals of optical fibers are output to the photoelectric detector through the coupler, the photoelectric detector measures the light signals to output the light signals to the detection circuit, the detection circuit converts the detected light signals to electrical signals and subjects the electrical signals to amplification processing to transmit the processed electrical signals to the computer, and the computer performs real-time data processing and display. The sensitive optical fiber is an optical fiber subjected to irradiation and annealing process and has the advantages of being small in size, light, flexible in structure, resistant to electromagnetic interference and electric insulating, the attenuation of the sensitive optical fiber has stable relation of dependency on temperature, and the system can be used for temperature measurement of an electrical power system with high voltage, large current, strong electromagnetic interference, narrow space and the like and is applicable to the fields of tunnel fire early warning, oil exploitation downhole temperature monitoring and the like.

Description

technical field [0001] The invention relates to a distributed temperature measurement system based on the temperature dependence of optical fiber radiation-induced attenuation, and belongs to the technical field of temperature measurement. Background technique [0002] Temperature is one of the most basic physical quantities in science and technology, and it is also one of the most common and important parameters in industrial production. Temperature detection plays a very important role in modern industrial systems and engineering applications. Traditional temperature sensors represented by thermocouples, platinum alloys and semiconductors have been widely used many years ago due to their simple principle, low cost and high precision, and play an irreplaceable role in many occasions. However, in some harsh environments with electromagnetic interference or flammable and explosive, traditional temperature sensors based on electrical signal measurement are greatly limited or ...

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Problems solved by technology

BOTDAR fully distributed sensing technology has accumulated some achievements after more than ten years of research, and has obtained good test results in some large and super large structures, but there is still a certain distance from practical application, mainly the following problems First of all, the most widely used Brillouin strain sensor is the tight-buffered optical fiber. The sensor with this structure has a low survival rate on site, and also has disadvantages such as low spatial resolution, poor accuracy, and long sampling time.

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