温度对磁致伸缩液位传感器测量精度的影响

The temperature effect on the measuring accuracy of a magnetostrictive liquid lever sensor

介绍了磁致伸缩液位传感器的工作原理。总结了温度对晶振频率、回波速度和液体密度的影响,分析了系统因以上参数变化而产生测量误差的原因。介绍了可消除晶振温漂和回波速度变化引起的测量误差的双辅助磁性浮子法,并对用以校正液体密度变化而引起的测量误差的温度补偿法进行了详细的论述。

This paper presents the working principle of a magnetostrictive liquid level sensor and the temperature effect on the crystal oscillator frequency, echo speed and liquid density. The paper also analyses the system measuring error caused by the variation in parameters. Two effective adjustment methods are discussed. One is a double auxiliary magnetic float method, which can eliminate the measuring error caused by crystal oscillator＇ s warm floats and the variation in echo speed, and the other is a temperature compensation method, which can adjust the system measuring error caused by the variation in liquid den- sity.