Line-element based nonlinear adaptive piecewise compensating correction for LVDT sensors

In order to solve the linear variable differential transformer (LVDT) displacement sensor nonlinearity of overall range and extend its working range, a novel line-element based adaptively segmenting method for piecewise compensating correction was proposed. According to the mechanical structure of LVDT, the output equation was calculated, and then the theoretic nonlinear source of output was analyzed. By the proposed line-element adaptive segmentation method, the nonlinear output of LVDT was divided into linear and nonlinear regions with a given threshold. Then the compensating correction function was designed for nonlinear parts employing polynomial regression technique. The simulation of LVDT validates the feasibility of proposed scheme, and the results of calibration and testing experiments fully prove that the proposed method has higher accuracy than the state-of-art correction algorithms.