Pointer dial plate automatic reading device based on laser displacement measurement and use method

A pointer dial plate automatic reading device based on laser displacement measurement comprises a spring screw arranged on the outer edge of the lower portion of a shell, a cross arm installed at the bottom end of a longitudinal arm and capable of adjusting the telescopic length in a sliding mode, and a rotating key, a zero scale key and a full scale key of a controller. According to the invention, adaptation to pointer dial plates with different diameter specifications, different pointer lengths and different measuring ranges is realized, the universality is very high, the arrangement is convenient, infinitesimal displacement jump occurring when a laser beam scans the position of the pointer on a dial plate plane can be accurately detected, and the accuracy of the detection result is improved. Therefore, the angular displacement of the angle sensor is converted into the scale reading value of the dial plate, the implementation is simple, the precision is high, the speed is high, and the method has good adapt