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A dual-parameter optical fiber sensing device for monitoring magnetic field and temperature and its implementation method

A technology of optical fiber sensing and implementation method, which is applied to measurement devices, uses optical devices to transmit sensing components, and converts sensor outputs, etc., can solve the problems of affecting sensitivity, poor long-term operation stability, and low measurement accuracy, and achieve cross-influence. The possibility of reducing the weight of the inspection equipment and increasing the accuracy of the measurement

Active Publication Date: 2021-09-07
HARBIN UNIV OF SCI & TECH
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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; but T. Liu et al. measure the temperature and pressure of the dual-parameter measurement, and do not monitor the dual parameters at the same time, and because both the temperature and the pressure 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 of the device reduces the portability of the device; W. Li et al. adopt the way of two optical fiber fusion, because the refractive index can not be completely the same, it will affect the interference signal and affect the measurement accuracy; the magnetostriction adopted by Z. Ding et al. The magnetostrictive 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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  • A dual-parameter optical fiber sensing device for monitoring magnetic field and temperature and its implementation method
  • A dual-parameter optical fiber sensing device for monitoring magnetic field and temperature and its implementation method
  • A dual-parameter optical fiber sensing device for monitoring magnetic field and temperature and its implementation method

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Embodiment Construction

[0033] The following embodiments will describe the specific implementation of a dual-parameter optical fiber sensing device for monitoring magnetic field and temperature proposed by the present invention with reference to the accompanying drawings.

[0034] Such as figure 1 As shown, the present invention provides a structural diagram of a dual-parameter optical fiber sensing device for monitoring magnetic field and temperature. The ASE light source (1) emits a light beam that is transmitted to the fiber coupler (2), and the output beam of the fiber coupler (2) is transmitted to The sensing unit (3), the light beam is reflected and transmitted in the sensing unit (3), when the sensing unit (3) is placed in the magnetic field module (4) to be measured, the sensing unit (3) is in the magnetic field to be measured The magnetostrictive ring (3-3) in the module (4) expands and contracts, and the air F-P cavity changes, which affects the optical path of the reflected light, thereby ...

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Abstract

The patent of the present invention provides a dual-parameter optical fiber sensing device for monitoring magnetic field and temperature, which includes ASE light source (1), optical fiber coupler (2), sensing unit (3), magnetic field module to be measured (4), magnetization device (5), photoelectric converter (6), and signal processing module (7). The patent of the present invention uses optical fiber for sensing, and utilizes the principle of the Fap cavity to make the light emitted by the ASE light source generate an interference spectrum in the Fap cavity. Through the detection of the interference spectrum, the magnetic field and temperature are measured, and the digital signal is realized through the signal processing module. output to achieve the purpose of displaying on the computer. The invention reduces the size of the sensing unit, increases the sensitivity of the sensing, reduces the cross influence of different parameters, and realizes the purpose of simultaneously monitoring the magnetic field and temperature. At the same time, it can be output on the host, realizing real-time monitoring of the magnetic field and temperature.

Description

technical field [0001] The invention belongs to the field of power system monitoring, in particular to a dual-parameter optical fiber sensing device 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 With Compensation Plate, IEEE Photonic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D21/02G01D5/353
CPCG01D5/35312G01D21/02
Inventor 沈涛刘驰陈姣姣杨添宇恭艾娜王振家黄海宋明歆
Owner HARBIN UNIV OF SCI & TECH
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