Based Fpga Difference Ultrasonic Wind Sensor System

With economic development, flow measurement in industry and agriculture is an important role. Measurement of wind velocity and direction of the wind power generating plays a very important role. Ultrasonic measurement instruments as a non-contract in the field of the instruments have wide application. Ultrasonic wind speed and direction measurement system compared with the traditional which has high measurement accuracy, no rotating parts, and no mechanical wear.The design uses the time-difference measured wind speed and direction, designs ultrasonic wind speed and direction sensor system which includes front-end circuits and back-end circuits based on the time-difference using FPGA. The Front-end circuits include the sensor's low-voltage drive circuit, preamplifier circuit, filter circuit, the voltage comparator circuit and the signal isolation circuit. Using low voltage drive drives the sensor can reduce the debugging of the system. Back-end circuits include the signal generator circuit, the signal detection circuit, FIFO circuit, LCD driver circuit and UART protocol Circuit. The system can launch and receive ultrasonic signal, and get the time of flight of ultrasonic signal according to design precision after verification. The scheme is basically able to reach the design requirements; measurement precision indicator of the system can not be measured because of conditions of the experiment. At the end, we get a summary of the system design, and give the system improvements.