磁弹效应索力传感器的差动式温度补偿及试验研究

Differential Temperature Compensation and Experimental Studies of Magneto-Elastic Effect Cable Force Sensor

在研究旁路结构的磁电复合材料索力传感器检测方法基础上,运用铁磁性分子场理论和布洛赫自旋波方法,建立磁化强度与温度的函数关系,研究温度对检测精度的影响机理。提出一种并行装配的温度补偿传感器磁路结构,运用差分运算技术,设计具有分时共享信号调理功能的差动式信号处理电路,实现全温度范围的差动式自动补偿。试验表明,在0~20 k N变载下,-30℃～＋80℃温度范围内,对诱导电压信号的波动影响小于1%,测量重复误差0.04%~0.30%,有效解决了温度补偿难题,能够满足索力检测工程要求。

On the basis of the study of cable force test method using bypass structure based on magneto-electric laminated composite,using the ferromagnetic molecular field theory and Bloch spin wave method,the function relation between magnetization and temperature is established to study the influence mechanism of temperature on test accuracy. The temperature compensation sensor with a parallel assembly magnetic circuit structure is proposed. Using the difference operation technology,a differential signal processing circuit with time sharing signal conditioning function is designed to realize the automatic compensation for the whole temperature range. Test shows：under the 0~20 kN variable load and in-30℃~＋80℃temperature range,the influence of temperature fluctuation is less than 1%;measurement repeatability error is 0.04%~0.30%. It can solve the problem of temperature compensation effectively and meet the requirements of cable force test engineering.