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The Ultrasonic Flowmeter Based on DSP

Author: ZhangJun
Tutor: ShaoJie
School: Nanjing University of Aeronautics and Astronautics
Course: Circuits and Systems
Keywords: Ultrasonic flowmeter Digital Signal Processor Field Programmable Gate Array Correlation algorithm Interpolation algorithm
CLC: TH814
Type: Master's thesis
Year: 2005
Downloads: 534
Quote: 20
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Abstract


As a non-contact ultrasonic flow meter with its inherent advantages in the oil , pharmaceutical , water management and other fields have a wide range of applications , the key parameter is the system accuracy . The article first analyzes ultrasonic flowmeter in principle and on the basis of the gap between domestic and foreign products , presents a DSP-based transit-time ultrasonic flowmeter improvement program . In order to improve measurement accuracy , the article presents a gap-type multi-pulse emission scheme , while using correlation algorithm to calculate the delay that is velocity, and the use of software interpolation to improve the time resolution . Then the system calculates the specific article in the transmitter , and other aspects of sampling and interpolation parameters . The hardware consists of an ultrasonic transmitter and receiver circuits , digital signal processing circuit and back-end service circuit . FPGA control software is the most important part of the entire system software development, as well as to realize the DSP algorithms . System to complete the ultrasonic signal emitting and collecting , in accordance with the accuracy required to calculate the difference of the two signals . Experimental results show that the scheme could meet the design requirements, because experimental conditions, the accuracy of the system specific indicators also can not be measured . Finally, the paper gives the system improvements.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Thermal measuring instruments > Flow Meter
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