Self-calibration for embedded angle displacement sensor based on difference quotient
SUN Shizheng1,2,3, HE Zeyin1, DONG Shaojiang1
1.School of Mechanotronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074;
2.Post-Doctoral Research Station, Kunshan Business Incubator for Overseas Chinese Scholars, Kunshan Jiangsu 215300;
3.Traffic and Transportation Post-doctoral Research Station, Chongqing Jiaotong University, Chongqing 400074
Abstract：In order to get rid of the dependence of primary standard implement and realize field calibration of the embedded angle displacement sensor, a self-calibration method was proposed by using difference quotient of measured values by a discrete probe. With the proposed method, error function was separated into multiple harmonics by Fourier approach model. Ahead difference quotient of the measured values was used to obtain intermediate variable of the calibration model. The Taylor expansion was applied to estimate the model error, which was reduced by increasing the order of difference quotient. To ensure calibration precision, the least squares algorithm was used to find the optimal parameters. Two embedded angle displacement sensors were calibrated by using the proposed method, which was compared with the traditional method. The actual calibration experiments show that the original errors of two sensors have been reduced from ±30″ and ±25″ to ±2.6″ and ±2.2″, and the calibration parameters are consistent with actual sensor’s error component. The self-calibration precision is nearly the same to the accuracy of standard implement calibration and can be satisfied angle displacement sensor’s calibration requirements.
孙世政1,2,3，何泽银1，董绍江1. 基于差商法的嵌入式角位移传感器自标定[J]. 振动与冲击, 2017, 36(13): 252-257.
SUN Shizheng1,2,3, HE Zeyin1, DONG Shaojiang1. Self-calibration for embedded angle displacement sensor based on difference quotient. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(13): 252-257.
