System and method for measuring geometric dimension of expansion joint of metal corrugated pipe

The invention discloses a system and method for measuring the geometric dimension of a metal corrugated pipe expansion joint, and relates to the field of measurement of the geometric dimension of the metal corrugated pipe expansion joint, and the system comprises a rotary table which is used for placing a to-be-measured metal corrugated pipe expansion joint; the movement mechanism is used for driving the grating ruler and the laser sensor to generate displacement in the vertical direction and displacement in the horizontal direction; the programmable controller is used for receiving a measurement signal sent by the upper host, controlling the movement mechanism to operate according to a preset mode according to the measurement signal, driving the rotary table to rotate according to a preset rule, controlling the grating ruler to send a high-frequency pulse signal, receiving the high-frequency pulse signal and sending the high-frequency pulse signal to the upper host; and the upper host is used for sending a m