Nonlinear Compensation of LVDT Displacement Sensor Based on ADμC845
Yueyou Qiu · Chuangan jishu xuebao · 2013
Because the linear variable differential transformer(LVDT)displacement sensor measurement circuit has nonlinear relationship between output voltage value and displacement,it is difficult to design and product high precision sensor with 0.05% linearity.In order to improve the design precision of the LVDT displacement sensor,nonlinear correction is performed using single-chip microcomputer software algorithm,after analyzing the main cause reason of the nonlinear error based on the traditional correction method.The characteristic curve of nonlinear correction link is obtained by fitting the sensor calibration data.And the polynomial coefficients are found by least square method with MATLAB software.Simulation and experiment results show that the nonlinear correction effect is very good,displacement measurement linearity can meet the design requirements,and this method has a good application prospect.