2006•Yibiao jishu yu chuanganqiRequires access

Application of ZOOM-FFT technology in Ultrasonic Flow Measurement

Guanping Feng

Abstract

To study a new type ultrasonic Doppler flow meter for industry flow measurement of the liquid in the airtight pipeline.Based on the intermediate frequency modulation to extract the flow direction,and introduced the ZOOM-FFT technology to estimate the frequency spectrum of demodulated ultrasonic Doppler signal and calculated the flow based on this.This method can judge the flow direction,reducing the lower limit of the low flow velocity,raising the dynamic response speed,real-time character and stability of flow velocity measurement.Experiment indicated that this flow meter reached 1.5 precision grade.

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