A Signal Processing Method for Vortex Flowmeter Based on Multi-Channel Parallel Filtering

Vortex flowmeters occupy an important position in the field of flow measurement. Their advantages include having no moving mechanical parts, the ability to adapt to various media, and low-pressure loss. After the vortex signal detected by the piezoelectric element is amplified and filtered through a series of analog and digital circuits, an accurate flow value can be obtained. To enhance the dynamic response performance of the vortex flowmeter, a multi-channel parallel signal processing method with 1/f<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> amplitude-frequency characteristic modulation has been designed. This method employs filtering units with a 1/f<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> attenuation characteristic (-40 dB/dec) combined with the physical relationship of the vortex signal's amplitude-frequency characteristics to expand the measurement range. The measurement channels are divided into several parallel channels, and a fast channel selection method is designed to effectively address the slow dynamic response speed of traditional vortex flowmeter signal processing methods. The results show that the vortex flowmeter integrated with the four-channel algorithm achieves 0.5-grade accuracy and exhibits superior dynamic response performance compared to Yokogawa flowmeters.