Research Of Ultrasonic Wind Velocity And Vane Measurement System Based On DSP

There are many advantages when ultrasonic is utilized to measure the velocity and vane of the wind. The ultrasonic velocity, influenced by the wind speed, could show a measurable difference when it transmits in the direction of forward flow or in the opposite flow. An ultrasonic anemometer and vane based on the theory was developed, with the superiorities of high precision, high dependability and high integration. Possessing the merits of simple installation, easy maintenance, no mechanical wear, high precision, no participation of man and complete intellectualization, compared to traditional mechanical or electromagnetic instrumentations. The proficient technique has not been widely used in related scale. There are many problems to be researched.TMS320F2812 is a 32bit microprocessor with abundant on-chip resources, and its handling capacity is up to 150M with low power consumption. It is suitable to make up an intelligent instrumentation. Therefore, the ultrasonic wind velocity and vane measurement system based on TMS320F2812 was researched in this study. The multiple variables including wind velocity and vane detection, display and communicate with PC by serial interface were discussed.The system hardware was modularly designed, and as a result, the complexity of complicacy system hardware design was predigested, while the system stabilization and reliability were enhanced. Considering the characteristics of ultrasonic signals, CX20106 was chosen to determine the arrival time of ultrasonic signals.The system software was modularly designed as well, and its portability, readability and stabilization were developed. Software was programmed by a mixing of both C language and assembly language. C language has the advantages of simple programming and good portability, however, the code generated is relatively longer, and the control power to hardware is not so satisfied. On the other hand, assembly language is just of the opposite quality: shorter code, better control to hardware, yet the programming are complex. In order to integrate the virtues of C and assembler language, mixed programming is the best way to achieve the goal of high speed and maximum code efficiency.At the end of the thesis, a contrastive experiment was completed and the system error analysis was given. Then a conclusion is drawn.