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长春光学精密机械与物... [1]
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会议论文 [1]
发表日期
2011 [1]
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Compensation of moire fringe sinusoidal deviation in photoelectrical encoder based on tunable filter (EI CONFERENCE)
会议论文
2011 Symposium on Photonics and Optoelectronics, SOPO 2011, May 16, 2011 - May 18, 2011, Wuhan, China
Wang Y.
;
Liu Y.
;
Yan X.
;
Chen X.
;
Lv H.
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提交时间:2013/03/25
In order to improve the precision of the absolute photoelectrical encoder
a compensating method is put forward
which restrains the harmonics in moire fringe signal. After analyzing the relationship between the subdividing error and the sinusoidal index
a low-pass digital filter which can make the moire signal satisfy the need of 1024 subdivision is designed. Considering with the fundamental frequency varies with the rotating speed of encoder
the tunable filter is adopted
whose cutoff frequency is calculated according to the coarse information of the encoder. The simulating results show that the proposed method can improve the sinusoidal index
especially at high rotating speed. At last
the compensating algorithm is implemented in the terminal of satellite optical communication
which needs high resolution. The experimental results show indicate that the developed method is feasible. 2011 IEEE.
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