Optical encoder！

A photoelectric encoder is a sensor that converts the mechanical geometric displacement of the output shaft to a pulse or digital quantity by photoelectric conversion. This is currently the most widely used sensors, optical encoder is from the grating disk and photoelectric detection device. Grating disk is a certain diameter of the circular plate on the opening of a number of rectangular holes.

As the optical encoder and motor coaxial, motor rotation, the grating disk and the motor at the same speed rotation, the light-emitting diodes and other electronic components of the detection device to detect the output pulse signal, by calculating the number of pulses per second optical encoder output Can reflect the current motor speed. In addition, to determine the direction of rotation, the code plate can also provide phase difference of 90 Â · two-way pulse signal.

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