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Vol. 175, Issue 7, July 2014, pp. 257-261

 

Bullet

 

Signal Processing of Vortex Flow with Noise Based on Wavelet Analysis
 

Xiaohong Zeng

Chongqing College of Electronic Engineering, Chongqing 401331, P. R. China
Tel.: +86 18523062628, fax: +86 2365927000

E-mail: zengxh111@126.com

 

Received: 9 June 2014 /Accepted: 28 June 2014 /Published: 31 July 2014

Digital Sensors and Sensor Sysstems

 

Abstract: The vortex of low speed flows is difficult to measure resulted in that the output signal of vortex flowmeter appears the spectral line splitting and frequency offset in the low SNR and causes the frequency resolution to be decreased. In the paper, it first conducted the multi-scale wavelet decomposition to the vortex signal with noise, then removed the noise spectrum and carried on power spectrum analysis and frequency correction for the actual signal of stress type vortex flowmeter, and finally determined the vortex signal frequency to be as the basis for designing band-pass filter. By means of Matlab software, it took a signal with noise as an example, and reconstructed an effective sine signal by wavelet denoising algorithm. The simulation experiment shows that the presented method is effective.

 

Keywords: Vortex flow, Hydrometry, Signal processing, Wavelet analysis.

 

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