描述
增量编码器因此脉冲式样输出的传感器，其码盘比尽对编码器码盘要大略得多且辨别率更高。平常只必要三条码道，这里的码道实际上已不具有尽对编码器码道的意义，而是产生存数脉冲。它的码盘的外道和中央道有数量雷同匀称散布的透光和不透光的扇形区（光栅），但是两道扇区相互错开半个区。当码盘转动时，它的输出信号是相位差为90°的A相和B相脉冲信号以及只有一条透光狭缝的第三码道所产生的脉冲信号（它作为码盘的基准位置，给计数体系提供一个初始的零位信号）。从A，B两个输出信号的相位干系（超前或滞后）可鉴定旋转的方向。由图3（a）可见，当码盘正转时，A道脉冲波形比B道超前π/2，而反转时，A道脉冲比B道滞后π/2。图3（b）是一实际电路，用A道整形波的下沿触发单稳态产生的正脉冲与B道整形波相‘与’，当码盘正转时只有正向口脉冲输出，反之，只有逆向口脉冲输出。因此，增量编码器是根据输出脉冲源和脉冲计数来确定码盘的转动方向和相对角位移量。通常，若编码器有N个（码道）输出信号，其相位差为π/N，可计数脉冲为2N倍光栅数，如今N=2。图3电路的缺点是偶然会产生误记脉冲造成偏差，这种环境出如今当某一道信号处于‘高’或‘低’电平状态，而另一道信号正处于‘高’和‘低’之间的往返变化状态，此时码盘虽然未产生位移，但是会产生单方向的输出脉冲。比方，码盘产生抖动或手动对准位置时（下面可以看到，在重力仪丈量时就会有这种环境）。
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