空心互感式位移传感器

Air-Core Mutual-Inductance Displacement Sensor

介绍一种空心互感式位移传感器,其工作原理是采用开关方式,以恒流源双向向空心互感的原边线圈充放电,采样副边线圈在稳定放电期间的窄脉冲高度来测量位移量,量程可达20 mm,相对精度为2%。论述了互感值的测量,分别设计了轴向和径向两个位移的试验及捕获采样数据的电路,从数据分析证明该方法可以测量位移,减少了空心线圈中的干扰对测量的影响,轴向位移还可以直接测量电介质材料的厚度。

A kind of air-core mutual-inductance displacement sensor is introduced,and the switching mode is adopted as its operating principle.The primary winding of the air-core mutual-inductor is charged and discharged bi-directionally with a constant current circuit.Displacements are measured by sampling the secondary winding based on height of narrow pulses during stable discharging periods.The measure range can reach 20 mm and the relative precision is 2%.The method of mutual-inductance measurement is demonstrated,for which two tests of axial and radial displacements and the circuit for capturing sampled data are designed respectively.Through data analysis,the method is proven available to measure displacement and reduce the interference of air core coil to measurement.The axial displacement can also be used to measure directly the thickness of dielectric substances.