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Three common signal forms for sensor output
- Jul 26, 2018 -

1. An absolute code signal is a signal corresponding to the state of an object to be measured. Like a code disc, each of its angular orientations corresponds to a set of codes, and this code is called an absolute code. The absolute code signal has a strong anti-interference ability. Regardless of what happens during the measurement, after the interference, a state always corresponds to a certain set of codes.
2. The characteristic of the incremental code signal is that the measured value is proportional to the number of change periods of the sensor output signal, that is, the magnitude of the output value is determined by the increment of the number of cycles of the signal change. When a general grating shift sensor, a magnetic grid displacement sensor, a laser displacement sensor, etc. measure displacement using an interference method or the like, the signal output from the sensor is an incremental code signal.
3. Switching signal: The switching signal has only two states, 0 and 1, which can be regarded as a special case when the absolute code has only one bit of encoding. The output of a sensor such as a travel switch or a photoelectric switch is a switching signal.

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