宽温域磁致伸缩位移传感器输出电压模型及特性分析

doi:10.19595/j.cnki.1000-6753.tces.221588

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Abstract Magnetostrictive displacement sensor uses the Wiedemann effect of magnetostrictive wire or strip to realize absolute displacement measurement, which has the advantages of high measurement accuracy, strong anti-interference ability, and long service life. With the technological development of energy, electric power, aerospace, and other fields, displacement sensors that can work stably at high temperatures have become urgent. However, when the working environment temperature is higher than theindoortemperature, magnetostrictive displacement sensors will face problems such as weakened output voltage, increased signal attenuation, and decreased measurement accuracy, which limit their high-temperature applications.
To expand the application range of magnetostrictive displacement sensors at high variable temperatures, this paper studies the output characteristics of magnetostrictive displacement sensors in wideoperating temperatures by increasing the output voltage of the sensor to eliminate the adverse effects of signal weakening and noise interference caused by temperature rise. In this work, Fe₈₂Ga_13.5Al_4.5 and (Fe₈₃Ga₁₇)_99.4B_0.6magnetostrictive wireswere successfully prepared, and all of their Curie temperatures are above 500℃, which could increase the upperworking temperature limit of sensors. The output voltage model of the sensor under non-isothermal conditions was established based on Boltzmann statistics, the magneto-elastic coupling effect, and the Debye model. The theoretical model shows that with the increase in temperature, the magnetization and Young's modulus of magnetostrictive material decrease. Meanwhile, the force-magnetic coupling characteristics change, and the output voltage of the sensor decreases. A temperature-variable platform with adjustable pulse current and axial bias magnetic field was setupby (Fe₈₃Ga₁₇)_99.4B_0.6 and Fe₈₂Ga_13.5Al_4.5 wires with a diameter of 0.8mm. The optimal parameters of excitation pulse current and bias magnetic field of the two kinds of wires are (1) (Fe₈₃Ga₁₇)_99.4B_0.6 at 21.3 kA/m and 24.6 A; (2) Fe₈₂Ga_13.5Al_4.5 at 16.7 kA/m and 18.8 A. At 20~350℃, the maximum output voltage of (Fe₈₃Ga₁₇)_99.4B_0.6 is 577.63mV, and the maximum output voltage of Fe₈₂Ga_13.5Al_4.5 is 419.56 mV. The results show that the maximum output amplitude can be obtained when the excitation magnetic field equalsthe bias magnetic field at different temperatures. According to the optimal excitation parameters of (Fe₈₃Ga₁₇)_99.4B_0.6 waveguide wire, the hardware circuit and the structure of the moving position magnet are designed. A wideoperating temperature prototype was made and tested on a high-temperature platform. At 20℃, the maximum output voltage was 595.32 mV, and the SNR was 13.74 dB. At 500℃, the output voltage is 254.67 mV, and the signal-to-noise ratio is 6.11 dB. The nonlinearity error of the sensor with increasing temperature is ±1.3 mm.
The experimental results show that the magnetostrictive displacement sensor has a wide operating temperature range, good output characteristics, a high signal-to-noise ratio, and a small measurement error. Consequently, the sensors can be applied to monitor position information in high-orvariable-temperature environments. The results can provide theoretical guidance for optimizing magnetostrictive displacement sensors working in wide operating temperatures.

Key words： Magnetostriction displacement sensor Fe-Ga waveguide wire wideoperating temperature output voltage model

Received: 18 August 2022

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TP212

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	Li Haiyi
	Li Mingming
	Liu Yanan
	Weng Ling
	Huang Wenmei

Cite this article:

Li Haiyi,Li Mingming,Liu Yanan等. Output Voltage Model and Characteristic Analysis of Magnetostrictive Displacement Sensor for Wide Operating Temperature[J]. Transactions of China Electrotechnical Society, 2023, 38(20): 5343-5353.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221588 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I20/5343

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