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| Study on System Design and Signal Processing Method ofAnti-fixed-strong-disturbance for Vortex Flowmeter |
| XU Ke-Jun1,2,ZHU Zhi-Hai1,JIANG Peng1,LIU San-Shan1 |
1.School of Electrical and Automation Engineering, Hefei University of Technology, Hefei,Anhui 230009,Chian
2.Engineering Technology Research Center of Industrial Automation, Hefei,Anhui 230009,Chian |
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Abstract There is strong-vibration-disturbance in industrial fields sometimes. The frequency of the disturbance is fixed and within the range of the vortex flow signal. Its power is large than that of the vortex flow signal. At this time, the digital vortex flowmeter can not obtain accurate measurement results according to the vortex flow signal power being maximal. Therefore a notch filter with adjusted frequency, width and depth is designed. The notch filter is firstly used to remove the fixed-strong-disturbance, and then the spectrum analysis is employed to estimate the frequency of the vortex signal, which can attenuate the fixed-strong-disturbance that is within the frequency range of the vortex flow signal, and not to affect measurement of the vortex frequency. A dsPIC33FJ256MC710 DSP made by Microchip Company is used to develop a digital signal processing system for vortex flowmeter, and the good experimental results are obtained.
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2011, Vol. 32 
