描述

盡對編碼器是直接輸出數(shù)字量的傳感器，在它的圓形碼盤上沿徑向有多少同心碼道，每條道上由透光和不透光的扇形區(qū)相間構(gòu)成，相鄰碼道的扇區(qū)數(shù)量是雙倍干系，碼盤上的碼道數(shù)便是它的二進制數(shù)碼的位數(shù)，在碼盤的一側(cè)是光源，另一側(cè)對應(yīng)每一碼道有一光敏元件；當(dāng)碼盤處于差別位置時，各光敏元件根據(jù)受光照與否轉(zhuǎn)換出相應(yīng)的電平信號，形成二進制數(shù)。這種編碼器的特點是不要計數(shù)器，在轉(zhuǎn)軸的恣意位置都可讀出一個穩(wěn)固的與位置相對應(yīng)的數(shù)字碼。顯然，碼道越多，辨別率就越高，對付一個具有N位二進制辨別率的編碼器，其碼盤務(wù)必有N條碼道。如今國內(nèi)已有16位的盡對編碼器產(chǎn)品。

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