| Ultrasonic flowmeter is applied widely in industrial measurement field for the two advantages, non-contact and installation and maintenance with ease. However, it also has some disadvantages, thus it is necessary to make modification and advance in order that it can work more stable and tried. The intention of this article is time difference ultrasonic flowmeter. The article makes particular research on the whole system,then I get the new method of measurement. Generally, there are four parts as the following:1. Research the measurement theory of time-difference-type ultrasonic flowmeter, derivate the theory formula and find the problem of the system. According to the question which must solve has carefully conducted theresearch, finally proposed the new survey plan. Eventually propagation character of ultrasonic in fluid is analyzed theoretically, which lays a solid foundation in theory for concrete circuit's realization.2. Has conducted the research to the hardware electric circuit of the overall system, including the hardware design of the FPGA, the VHDL description of essential function, has completed the C8051F120 monolithic integratedcircuit hardware electric circuit design, the debugging.3. This article has produced corresponding design drawing of the software ,the overall flow chart key partial.4. Analyze and study various factors which influence flow measurement. According to compare experiment result with other analyzed results, achieve the software capability's result in the end. Finally has carried on the simulation experiment.
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