在光電編碼器中每個傳感器用于一路信號的檢測。一條碼道可以配合兩個傳感器進行檢測，這兩個傳感器檢測出來的信號會有一定的相位偏差。從這組帶相位差的信號我們可以得到更多的信息比如旋轉方向。如果我們需要零位信號用于脈沖計數的校正，通常碼盤上還會有另一條軌道用于產生零位信號。
光學相位陣技術的原理是采集多路信號的平均值作為一路信號，所以帶來的好處是采集到是信號更加穩(wěn)定，適合應用在一些更復雜的環(huán)境當中
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