One kind of motion detection means based on the length of the slab and high-precision light curtain fpga

The present invention discloses a motion detection unit length of the slab and high precision based on FPGA light curtain, the light curtain comprising a laser detector accurately detecting means, a slab length measuring centralized controller and five equally spaced. Detecting means comprises a light curtain with high accuracy with high accuracy and precision light curtain light curtain emitter receivers; detector laser comprises a laser transmitter and laser receiver, the slab movement between the laser transmitter and a laser receiver; Laser Detector provided at the entry end of the slab, the light curtain accurately detecting means disposed at the downstream side of the slab; an output end of the laser receiver and the high-precision light curtain receiver is connected to the slab length measuring centralized controller. The present invention has high accuracy, fast response speed, anti-interference ability, easy to upgrade and other advantages, solves the problem of wear of the contact photoelectric encoder measurement program and the field caused by interference using an image processing program, suitable for metallurgical industry hot rolling mill.