A fully-automatic higher precision apparatus for angular displacement calibration

Abstract

Based on a higher raster angular displacement sensor, a fully-automatic higher precise apparatus for angular calibration is described. By using a higher resolution stepping motor, both of the two types of sensors, the standard raster sensor and the corrected sensor which are fixed in the same axial, can rotate coaxially at the same step. Meanwhile, the related software application platform is developed, which is being used for angular calibration and angular detecting. The output signals from the standard and corrected sensors can be transmitted to a host computer via one COM port. Take a kind of smart angular displacement sensor for calibration example, its angular displacement mathematic model embedded in MCU can be corrected by using this apparatus with higher accuracy so that the technique specification, like basic errors and linearity error can be improved greatly. For the four capacitive angular displacement sensors, their calibrating results sensors show that the averaged basic errors are 0.19%, 0.16%, 0.12% 0.15% respectively and the maximum is 0.62%, and the averaged linearity errors are 0.15% 0.12% 0.10% 0.14% respectively, and the maximum is 0.58% The accuracy of 1.0 level of this capacitive angular displacement sensor can be obtained.