Distributed optical fiber temperature measurement system
A technology of distributed optical fiber and photodetector, which is applied in thermometers, measuring devices, measuring heat, etc., and can solve the problems of long-term monitoring of difficult long-distance and large-scale cables
Pending Publication Date: 2020-06-26
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
The existing temperature monitoring technology uses a temperature monitoring chip, which can only monitor a small range of temperature points, and it is difficult to monitor long-distance and large-scale cables in all aspects and long-term.
Method used
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Embodiment Construction
[0013] In order to better understand the technical solution of the present invention, the following is a detailed description through specific embodiments:
[0014] The principle of using optical fiber to measure temperature is as follows:
[0015] When a light pulse of a specific frequency is used to irradiate the glass core in the optical fiber, various types of radiation scattering will occur. Such as Rayleigh scattering, Brillouin scattering and Raman scattering, among which Raman scattering is the most sensitive to temperature. Raman scattering occurs at every point of light transmission in the optical fiber, and the generated Raman scattered light is uniformly distributed in the entire spatial angle.
[0016] Raman scattering is caused by the energy exchange between the thermal vibration of the fiber molecules and the photon interaction. Specifically, if a part of the light energy is converted into thermal vibration, it will emit a light with a longer wavelength than the light...
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Abstract
The invention discloses a distributed optical fiber temperature measurement system for monitoring the temperature of a superconducting cable. The system comprises a laser light source, a sensing optical cable, a photoelectric detector, a switch, an acousto-optic alarm system and a background monitoring main station. The laser light source is connected with an optical fiber isolator and the outputend of the laser light source is connected into the sensing optical cable through an optical coupler, the sensing optical cable is arranged along a superconducting cable and fastened to the surface ofa superconducting cable heat insulation layer, the output end of the optical coupler is connected with the photoelectric detector, the photoelectric detector is connected into the switch, and the switch is connected with the acousto-optic alarm system and the background monitoring main station. According to the invention, temperature monitoring of the superconducting cable in a full-length rangecan be realized.
Description
Technical field [0001] The invention relates to a distributed optical fiber temperature measurement system used in the field of cable monitoring. Background technique [0002] As the density of electricity load increases, the load of power cables continues to rise. Superconducting cables have become a solution to ensure high-load and long-term power supply due to their super load capacity. The first kilometer-level superconducting cable has been built in China, and the construction, application and operation and maintenance management technology of superconducting cables are becoming increasingly mature. Due to the high cost of superconducting cables, operation and maintenance work has many particularities compared to ordinary power facilities. The all-round and full-time online monitoring technology for cable operating status, operating environment, and external damage risk has become an important support for the safe and stable operation of superconducting cables. [0003] Sup...
Claims
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Login to View More IPC IPC(8): G01K11/32G01K11/324
CPCG01K11/32G01K11/324
Inventor 宗明马国强徐俊洪旺松张俊利张寒朱钦
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO