Research & Realization On Vital Techniques Of Ultrasonic Flow Measurement System

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. This is the intention of this article, whose study object is time-difference-type ultrasonic flow measurement system. The article makes deeply theoretical research on several vital techniques to advance the capability of the whole system. In addition, it supplies methods of concrete cicuits' realizing. Generally, there are four parts as the following:1. Research the measurement theory of time-difference-type ultrasonic flowmeter, derivate the theory formula and show the measurement theory figure of time-difference-type ultrasonic flowmeter. Then discuss the distribution regularity of flow velcocity of piping fluid, especially revision coefficient of flow velcocity distribution according to correlative knowledge in hydromechanics. Eventually propagation character of ultrasonic in fluid is analyzed theoretically, which lays a solid foundation in theory for concrete circuit's realization.2. Discuss some vital techniques and their realization methods of hardwares in the whole system, including transducer's structure and parameter choice, signal examination circuit that is applied range examination theory and with CPLD improvement on launching driver circuit and precise measurement on propagating time.3. To counter that industrial meter require easy and simple operation of fingerboard, the article has a research on the software design method of common fingerboard, while combining advanced structure analysis method and structure design technique in software engineering, detaching concrete examination/controlled object.4. Analyze and study various factors which influence flow measurement. According to the distribution principle which is to stress main errors, compose all possible errors. In the end, the experience result is achieved.