Precision angle comparator using self-calibration of scale errors based on the equal-division-averaged method

Jong-Ahn Kim, Jae Wan Kim, Chu-Shik Kang, Jonghan Jin & Tae Bong Eom
An angle comparator for precision angle measurement is presented, which used the equal-division-averaged (EDA) method to self-calibrate the scale errors of a divided circle. The angle comparator mainly consists of an air bearing, friction motors, and a self-calibratable angle encoder. Using the air bearing and friction motors, we can generate the angular position with the resolution of less than 0.005". The divided circle of the angle encoder has 64800 signal periods within 360° and the...
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