Research On Gas Ultrasonic Flow Measurement Technology Based On DSP

Because the main field of fluid flow measurement and related instrumentation is in the industrial production process,the four parameters of flow,temperature,pressure and liquid level are usually collectively referred to as the four parameters of process control.Flow rate,as an important indicator for determining fluid motion characteristics,is not only the basic starting point for fluid theory analysis,but also a reference standard for verifying fluid theory.Through accurate measurement of the flow rate of the fluid and real-time adjustments to it,the safe and stable operation of the production process can be ensured,economic benefits can be improved,and the basic goals of scientific management can be achieved.Therefore,the development of ultrasonic flowmeters with high accuracy and stable reliability is a hot spot in industrial production and research.Understand the flow measurement principle based on the time difference method in the propagation velocity difference method,and use the TMS320F28335 in the DSP chip as the control and operation core chip of the system,and design a four-channel highprecision ultrasonic flowmeter prototype.The time difference method is determined to be the main measurement technique,and then the flowmeter design and sound channel layout schemes are proposed for the flow measurement principle of the time difference method,and the factors that may affect the accuracy of the measurement scheme are analyzed and feasible error correction schemes are proposed.In terms of software and hardware,the signal transmitting circuit,ultrasonic receiving circuit and signal switching circuit are designed,and the corresponding software program is written on the TMS320F28335 chip with CCS software,and the actual circuit is debugged and measured.Then we analyzed the measurement experiment data to know that the flowmeter prototype complies with the national industry standard and basically achieved the original design goal.Finally,the completion of the subject work is summarized,and combined with the currently completed ultrasonic flowmeter prototype,the design deficiencies and improvements are prospected.Figure 40;Table 7;Reference 51...