Double-parameter optical fiber sensing device for monitoring magnetic field and temperature and implementation method

Abstract

The invention provides a double-parameter optical fiber sensing device for monitoring a magnetic field and temperature and an implementation method. The double-parameter optical fiber sensing device comprises an ASE light source (1), an optical fiber coupler (2), a sensing unit (3), a to-be-measured magnetic field module (4), a magnetizer (5), a photoelectric converter (6) and a signal processingmodule (7). According to the device and method of the invention, sensing is carried out through an optical fiber; the Fabry-Perot cavity principle is utilized, light emitted by the ASE light source generates an interference spectrum in a Fabry-Perot cavity; the interference spectrum is detected, so that the magnetic field and the temperature are measured; digital output is realized through the signal processing module, so that display by a computer is achieved. According to the device and method of the invention, the size of the sensing unit is reduced, the sensing sensitivity is increased, the cross influence of different parameters is reduced, and the purpose of simultaneously monitoring the magnetic field and the temperature is achieved. Meanwhile, the signals can be output on a host, and real-time monitoring of the magnetic field and the temperature is achieved.

Description

technical field [0001] The invention belongs to the field of power system monitoring, and in particular relates to a dual-parameter optical fiber sensing device and a realization method for monitoring magnetic field and temperature. Background technique [0002] At present, the development of the power system is gradually improving, and the monitoring devices of the power system are also becoming more and more perfect. In the power system, the magnetic field and temperature will have a very high impact on the power equipment, and it is very important for the magnetic field and temperature monitoring of the power equipment. important. At present, there are many devices and methods for monitoring magnetic fields and temperatures using optical methods. [0003] For example, T. Liu et al. (T. Liu, C. Zhang, S. Wang, J. Jiang, K. Liu, X. Zhang, X. Wang, Simultaneous Measurement of Pressure and Temperature Based on Adjustable Line Scanning Polarized Low-Coherence Interferometry ...

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Problems solved by technology

[0004] Although the above-mentioned researchers use the principle of Fappel cavity to measure temperature, or use the combination of magnetostrictive material and fiber Bragg grating to measure current and magnetic field, compared with traditional electromagnetic current monitoring devices and traditional temperature measuring devices, they are in terms of safety and measurement range. , measurement accuracy and portability of the device have been greatly improved; however, T.Liu et al. did not monitor the dual parameters at the same time in the dual-parameter measurement of temperature and pressure, and because the temperature and pressure both change on the same part , simultaneous measurement will produce cross effects; the giant magnetostrictive material used by H.Zhao et al. uses epoxy resin to stick on the optical Bragg grating, the adhesive affects the sensitivity of the material, and then affects the sensitivity of monitoring, and the magnetic circuit The setting reduces the portability of the device; W.Li et al. adopt the way of two optical fibers to be fused, because the refractive index cannot be completely the same, it will affect the interference signal and affect the measurement accuracy; the magnetostriction adopted by Z.Ding et al. The magnetostriction coefficient of the material is small, and the measurement accuracy is not high during the measurement process; M.Yang et al. used magnetron sputtering to deposit the magnetostrictive material on the optical fiber, which has low purity and cannot control the uniformity of the film. Greatly affects the sensitivity, and the long-term running stability is poor

[0005] Therefore, in view of the problems of low sensitivity, poor long-term operation stability, cross-influence, and inability to simultaneously measure dual parameters in the existing technology, a dual-parameter optical fiber sensor device with high sensitivity, good stability, and simultaneous monitoring of magnetic field and temperature is proposed. and method

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