The Study Of Ultrasonic Flowmeter Based On Doppler Effect Method

The Ultrasonic Flowmeter is one kind of flowmeter which has been developed rapidly recently. It has many advantages and has been widely used in social production and social life, such as manufacturing production, medical treatment, oceanographic observation, Oil exploration and so on many realm. There are plenty of Series Products have been developed in home and abroad. But, to different application areas and situations, further research in this area is required in order to improve the environmental Sustainability, portability, stability and measurement accuracy of the Ultrasonic Flowmeter.In this paper, we first studied lots of Product Information of foreign Ultrasonic Flowmeter products, researched on their fundamental characteristics, and summed up the fundamental principle of Ultrasonic Flowmeter; then, some approaches of making Ultrasonic Flowmeter was introduced, and the innovative approach was put forward based on these researches-new design of Ultrasonic Flowmeter based on Doppler Effect Method. In this design, DSP was the signal processing core; CPLD was the control core; besides, there is also Front Analog Circuitry; the main algorithm is Fast Fourier Transform.In the paper, we finished both the hardware design and software design of Ultrasonic Flowmeter. The hardware was consists of analog circuit and digital circuit. The analog circuit includes ultrasonic transmitting, receiving, three stage amplifying and sample circuit. The digital circuit includes the design of DSP, FIFO and the single chip system, and the design of CPLD sequential control. The software of Ultrasonic Flowmeter includes CPLD programming, DSP programming used in calculating velocity of flow, and MCU program module. The whole software system was fully realized which includes the software design of filtering, interpolation, Fast Fourier Transform. The key algorithm of the whole system has been simulated by matlab, matlabSimulator, CosmosScope and so on.