Self-calibration for embedded angle displacement sensor based on difference quotient

SUN Shizheng1,2,3, HE Zeyin1, DONG Shaojiang1

Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (13) : 252-257.

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PDF(936 KB)
Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (13) : 252-257.

Self-calibration for embedded angle displacement sensor based on difference quotient

  • SUN Shizheng1,2,3, HE Zeyin1, DONG Shaojiang1
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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.

Key words

Embedded angle displacement sensor / Discrete probe / Difference quotient algorithm / Self-calibration / Calibration precision

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SUN Shizheng1,2,3, HE Zeyin1, DONG Shaojiang1. Self-calibration for embedded angle displacement sensor based on difference quotient[J]. Journal of Vibration and Shock, 2017, 36(13): 252-257

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