The Design Of Ultrasonic Gas Flowmeter Based On WinCE6.0

As the ultrasonic gas flowmeter can be used to measure the pulsatile flow, two-way flow, moisture and has the advantages of no pressure loss, wide range etc. Therefore, in recent decades, the research never stoped. It keeps improving along with the development of science and technology. At present, ultrasonic gas flowmeter has been widely used in oil and gas, metallurgical, chemical industry, etc. With the development of computer technology, embedded technology applied in instrument industry is undoubtedly conform to the requirements of The Times. Through to the domestic and foreign research achievements of synthesized and summarized, this article design a intelligent multi-channel ultrasonic gas flowmeter based on WinCE6.0operating system. The main work is as follows:(1) Based on the analysis of research background, development trend and different technical implementation of ultrasonic gas flowmeter, through to the comparison with the traditional flowmeter, this paper explains the important significance of the ultrasonic flowmeter and confirmed the the time difference method as the approaches.(2) Through the introduction and discussion of the time difference method, this paper provides a gaussian integral method of multi-channel flow calculation, combined with AGA Report No.9and the latest research results at home and abroad. The gaussian integral nodes and weights are determined by the second type Chebyshev polynomial. Then, by comparing the different implement ways of time difference method, this paper provides the detection algorithm of time difference based on correlation method, at the same time, the transition time is given through the combination of "echo method" and correlation.(3) This paper design a overall framework with WinCE6.0and ARM11as the main elements of embedded management platform and FPGA as the core of control module. The control module mainly realizes emitting and receiving of the ultrasonic signals and processing them, and providing the time difference and the transition time for the management platform. While the management platform mainly realizes flow calculation display, storage, inquires and the communication with the others. At the same time, the ultrasonic signal processing circuit, FPGA configuration circuit,4～20mA analog output circuit and the power supply circuit are designed.(4) Refer to the embedded microcontroller processor selection standards, this paper choose samsung S3C6410as the core of the management platform, and transplant the WinCE6.0operating system to the platform. After these, A regulatory platform of ultrasonic gas flowmeter is designed based on MFC to complete the waveform display of flow, measuring setting, output Settings and maintenance modes etc. And also, a period and peak inquires system is designed by using SQLite3database. Based on the introduction of serial communication agreement between FPGA and ARM11, the command word list is given. At last, the design of printed circuit boards is briefly introduced, and the top of the PCB design of the FPGA control module and its3D rendering are given.