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| Signal Processing for Coriolis Mass FlowmeterBased on Hilbert Transform |
| LIU Wei-lai, ZHAO Lu, WANG Ke-yi, FENG Zhi-hua, LONG Qian |
| Department of Precision Machinery and Precision Instrumentation, The University of Science and Technology of China, Hefei, Anhui 230027, China |
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Abstract In order to process the time-varying output signals of Coriolis mass flowmeter, the method based on Hilbert transform is adopted and investigated. Polyphase decimation filter and band-pass filter are applied to filter out noise respectively, then the original signal is combined with the output of its Hilbert transform to build the analytic signals. By co-conjugate multiplying them the phase difference is calculated, and the fluid mass flow measurement is implemented. A variety of methods are summarized and optimized to realize the Hilbert transform,while simulations are carried out for comparing them. The simulation and experimental results show that the method gets a good real-time performance and meets the measurement requirements.
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2013, Vol. 34 
