High-temperature superconducting coil temperature sensing structure and high-temperature superconducting coil temperature monitoring method

Abstract

The invention provides a high-temperature superconducting coil temperature sensing structure and a high-temperature superconducting coil temperature monitoring method, and belongs to the technical field of temperature monitoring of high-temperature superconducting coils. The high-temperature superconducting coil temperature sensing structure comprises fiber bragg grating sensing rings formed by aplurality of fiber bragg grating sensing heads connected in series uniformly through optical fibers; each optical fiber sensing head comprises metal fixed columns packaged at two ends of a capillary bent pipe; and the optical fibers pass through the metal fixed columns and marked with silver-plated fiber bragg grating sections. When the high-temperature superconducting coil is subjected to temperature monitoring, the plurality of fiber bragg grating sensing rings are sequentially and uniformly laid on the upper surfaces of the high-temperature superconducting coils from inside to outside, andthe positions of the fiber bragg grating sensing heads on the two adjacent fiber bragg grating sensing rings are mutually staggered. When the high-temperature superconducting coil is subjected to temperature sensing, influence of external strain can be avoided, no temperature monitoring blind area is formed, and monitoring is comprehensive and reliable; and in addition, online detection of the temperature of the high-temperature superconducting coil can be achieved, a temperature feedback signal is rapidly provided for a quench protection system, and stable operation of a superconducting magnet is guaranteed.

Description

technical field [0001] The invention relates to the technical field of temperature monitoring of high-temperature superconducting coils, in particular to a high-temperature superconducting coil temperature sensor capable of avoiding the influence of external strains when sensing the temperature of high-temperature superconducting coils, without blind spots in temperature monitoring, and capable of comprehensive and reliable monitoring. Structure and temperature monitoring method of high temperature superconducting coil. Background technique [0002] With the development of superconducting technology, high-temperature superconducting magnets have been widely used in motors, transformers, current limiters, energy storage and other fields. A key research point for the practical use of high temperature superconducting magnets is the stable operation of the magnets. During operation, if external disturbances such as overcurrent, overheating, and mechanical strain occur, the supe...

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Problems solved by technology

However, traditional temperature detection methods are usually based on traditional electrical temperature sensors such as thermocouples and thermal resistances, which are based on the measurement of electrical signals, and high-temperature superconducting magnets are usually in a strong magnetic field environment, so the measurement results are susceptible to electromagnetic interference

At the same time, sensors such as thermocouples and thermal resistances are point-measurement sensors. To achieve distributed temperature measurement of magnets, a large number of sensors are required. Each sensor is usually connected in a 4-wire system, so it is necessary to use A large number of copper leads, the wiring needs to occupy a lot of space, at the same time, a large number of copper leads are used, the wiring is troublesome, and it will bring a cooling burden to the low-temperature environment, and it will also cause heat leakage problems to the low-temperature system

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