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《Journal of Beijing University of Aeronautics and Astronautics》 2006-01
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Application of novel method of digital to frequency conversion in Coriolis mass flowmeter

Zheng Dezhi Fan Shangchun Xing Weiwei(School of Instrument Science and Opto-electronics Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China)  
A new data transforming method of D/F(digital to frequency conversion) was adopted to export frequency in the novel digital Coriolis mass flowermeter.The frequency output was completed by the crystal and the FPGA(field programmable gate arrays) together with the DSP(digital signal processing).The influence of V/F(voltage to frequency conversion method) in the traditional analog Coriolis mass flowmeter was avoided,for example,the conversion precision was not high,temperature excursion and the circuits were more complex.And the frequency output was not whole period because of the frequency update,which influenced the frequency output result.The experimental results show that the transforming method of digital to frequency conversion has high conversion precision and realizes the whole period frequency output.In addition,it also has not the temperature excursion of the voltage to frequency conversion method.The circuits are simple and seamless to connect with digital circuit.Thus the method is well worthy applying in digital system.
【Fund】: 国家自然科学基金资助项目(60274039)
【CateGory Index】: TH814
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