Xj. Li et al., A MICROCONTROLLER-BASED SELF-CALIBRATION TECHNIQUE FOR A SMART CAPACITIVE ANGULAR-POSITION SENSOR, IEEE transactions on instrumentation and measurement, 46(4), 1997, pp. 888-892
A self-calibration technique for capacitive position sensors, based on
the use of a microcontroller is presented. This technique offers a go
od trade-off between the memory size of the microcontroller and the al
gorithmic complexity. The application of this technique for self-calib
ration of the inaccuracy caused by the geometrical errors and pattern
errors in a smart capacitive angular-position sensor is discussed. Thi
s self-calibration technique doesn't need any accurate reference. Expe
rimental results show that the self-calibration is relatively effectiv
e in reducing the influences of the geometrical errors and pattern err
ors of the sensor. The reduction of the inaccuracy of the smart capaci
tive angular-position sensor amounts to more than a factor of two.