However, it is possible to have an absolute optical encoder which has a disk that looks like this, where different angles have different sections open to let the light through.
然而， 可以有一个绝对光学编码器， 它有一个看起来像这样的圆盘，其中不同的角度有不同的部分打开以让光线通过。
Absolute encoder
原声例句
科技智慧坊
英语百科
Rotary encoder
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A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code.
There are two main types: absolute and incremental (relative). The output of absolute encoders indicates the current position of the shaft, making them angle transducers. The output of incremental encoders provides information about the motion of the shaft, which is typically further processed elsewhere into information such as speed, distance and position.
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