基于磁致伸缩扭转波温度传感器的设计与优化  

Design and optimization of temperature sensor based on magneto strictive torsional wave

作　　者：李保良 李明明[1,2] 李海毅 翁玲[1,2] 黄文美[1,2] Li Baoliang;Li Mingming;Li Haiyi;Weng Ling;Huang Wenmei(State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei University of Technology,Tianjin 300130,China;Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]河北工业大学省部共建电工装备可靠性与智能化国家重点实验室,天津300130 [2]河北工业大学河北省电磁场与电器可靠性重点实验室,天津300130

出　　处：《仪器仪表学报》2022年第10期58-65,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51777053,51801053,52077052);中央引导地方科技发展资金项目(226Z1704G);河北省自然科学基金(E2019202315,E2022202067)项目资助。

摘　　要：超声导波温度传感器是目前工业领域中新兴的测温仪表,其导波的选取对传感器的测温性能有着重要的影响。磁致伸缩扭转波具有易于产生与拾取、衰减小的特点,且其波速随温度呈线性关系,适合应用于超声导波温度传感器的设计。本文选用磁致伸缩材料Fe83Ga17丝产生和传导磁致伸缩扭转波,通过固定距离内扭转波的飞行时间与温度的关系,计算扭转波的波速与温度的拟合关系,根据该拟合关系与实测扭转波波速实现温度测量,并提出了基于磁致伸缩扭转波温度传感器的输出电压模型。实验可得,在室温~500℃下,磁致伸缩温度传感器的输出电压幅值达到215.7~465.2 mV,与本文提出的输出电压模型一致,能够满足一定温度范围内的测温要求。为提高温度传感器的测温上限,将Fe83Ga17丝与热敏材料Ni20Cr80丝耦合成新的波导丝,得到了结构优化后的温度传感器。在室温~1 200℃温度区间内,传感器能够输出幅值范围为44.9~85.6 mV的输出电压信号,温度与扭转波波速的拟合关系始终保持高度线性,有能力实现1 200℃以下的可靠测温。The ultrasonic guided wave temperature sensor is currently an emerging temperature measuring instrument in the industrial field, and the selection of its guided wave has important impact on the performance of the sensor. Magnetostrictive torsional wave is suitable for the application, as the basis for temperature measurement with its wave speed proportional to the temperature as well as the characteristics of low decay and easily pick-up. In this article, the magnetostrictive material Fe83Ga17wire is selected to generate and conduct magnetostrictive torsional waves. The relationship between the flight time and temperature of the torsional wave at a fixed distance is calculated to achieve the fitting relationship between the wave velocity and temperature. According to the fitting relationship and the measured torsional wave velocity, the temperature measurement is realized, and an output voltage model based on a magnetostrictive torsional wave temperature sensor is proposed. In experiments, the output voltage of the magnetostrictive temperature sensor reaches 215.7~465.2 mV under the room temperature up to 500℃. The fitting relationship between the measured temperature and the wave velocity can be used as a basis for temperature measurement. To increase the upper temperature measurement limit of the temperature sensor, Fe83Ga17wire is coupled with the heat sensitive material Ni20Cr80wire into a new waveguide wire, and the temperature sensor after structural optimization is obtained. The unamplified output voltage of the optimized sensor reaches 44.9~85.6 mV under the temperature from room temperature up to 1 200℃. The wave speed of the torsion wave remains highly proportional to the temperature in the temperature region, which is capable for reliable temperature measurement under 1 200℃.

关 键 词：温度传感器 磁致伸缩扭转波 输出电压 波速 热敏材料 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH711[自动化与计算机技术—控制科学与工程]