Three classifications of digital signals output by sensors
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Sensors generally have many forms of output, such as digital signals and analog signal outputs. Sensor signals have their own advantages, but digital signals are more expensive than analog signals. However, the impedance during transmission is small and the anti-interference ability is strong, which is more suitable for current social technology. development of. The digital signal output of the sensor is also divided into three types, which are incremental code signal, absolute code signal and switch signal.
    Incremental code signal, 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 measuring displacement by grating, magnetic grid, laser interferometry, etc., the signal output by the sensor is an incremental code signal.
      The absolute code signal, which is a signal corresponding to the state of the 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. Absolute code signals have a strong anti-interference ability, regardless of what happens during the measurement process. After the interference, a state always corresponds to a certain set of codes.
     The switching signal, the switching signal has only two states of 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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