2004•Yibiao jishu yu chuanganqiRequires access

Continuous-wave Ultrasonic Doppler Method for Pipe-flow Measurements

Luo Shou-nan

Abstract

Introduced a system for pipe-flow measurements based on continuous-wave(CW)ultrasonic Doppler method.To process the CW Doppler signal,intermediate-frequency(IF) demodulation,zoom FFT (Fast Fourier Transform)and weighted average algorithm for frequency evaluation were implemented in a single digital-signal-processing device.Thus we solved problems in conventional ultrasonic Doppler flowmeters such as hard to measure low velocity flow and decide the flow direction.

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Available abstract

Key concepts: Doppler effect, Ultrasonic sensor, Fast Fourier transform, Acoustics, Acoustic Doppler velocimetry, Flow measurement, Ultrasonic flow meter, SIGNAL (programming language)