In view of the water-meter’s tumor-initiating component with revolution

a kind of measurement system with laser sensor is designed.Half transparent and the mirror is used in the optical configuration to make coaxial optical path

and realize accurate aiming and positioning.Processing system is designed with FPGA and DSP that the laser echo signal’s digitallize processing and selection of the threshold value can be carried out to reduce the probability of false alert.The experimental results show that the measurement system has high detection efficiency and accuracy after calibration

which can realize real-time measurement of water-meter’s error.