Low-power consumption two-wire system vortex flowmeter

A vortex flowmeter, two-wire technology, applied in the direction of volume/mass flow generated by mechanical effects, volume indication and recording equipment, and through detection of dynamic effects of fluid flow, etc., can solve the problem of inability to guarantee on-site measurement accuracy and range ratio Limited, can not effectively measure small flow and other problems, to ensure real-time performance, improve measurement accuracy, and realize the effect of digital signal processing

Inactive Publication Date: 2008-04-16
HEFEI UNIV OF TECH
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Problems solved by technology

However, conventional signal processing methods, that is, amplification, shaping, filtering and counting, cannot ef

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  • Low-power consumption two-wire system vortex flowmeter
  • Low-power consumption two-wire system vortex flowmeter
  • Low-power consumption two-wire system vortex flowmeter

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[0038] The present invention will be further explained below in conjunction with the drawings.

[0039] The design idea of ​​the present invention is: not only adopts digital signal processing method, but also ensures that the meter works with low power consumption. Therefore, a low-power single-chip microcomputer is used to perform a few-point fast Fourier transform (FFT) to realize periodic graph analysis and determine the vortex signal Design a set of hardware bandpass filters, whose passband covers the frequency band where the vortex signal is located, select specific bandpass filters according to the results of spectrum analysis, and perform adaptive filtering to eliminate various harmonics to the greatest extent And the impact of site noise on the measurement, improve the measurement accuracy. A digital potentiometer and an operational amplifier are used to form a program-controlled amplifier. The amplitude of the vortex signal is determined by peak detection, and the amplif...

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Abstract

The present invention relates to the flow detection field, in particular to a low power consumption two-wire system vortex street flowmeter which consists of a piezoelectric transducer, a charge amplifier, a voltage amplifier, a program-controlled amplifier, a lowpass, a voltage follower, a peak detection circuit, a band-pass filter set, a multiway switch gate circuit, a wave shaping circuit, a singlechip, a man-machine interface circuit and a 4-20 mA output and power management circuit, wherein, the singlechip detects the peak value and the frequency of the vortex street signal to amplify and filter the vortex flow signals by controlling the program-controlled amplifier and the band-pass filter. The technology overcomes the problems that the prior art can not achieve low power consumption while measuring small flow, expanding measuring range rate and improving measuring precision effectively. While ensuring measuring small flow, expanding measuring range rate and improving measuring precision effectively, the invention achieves low power consumption of outputting the direct current of 4-20 mA and the operating current less than 4mA and achieves the two-wire system operation.

Description

technical field [0001] The invention relates to the field of flow detection, and is a low-power two-wire vortex flowmeter, in particular a low-power, Two-wire vortex flowmeter signal processing system. Background technique [0002] The vortex flowmeter has the characteristics of various types of measuring media, and is widely used in the field of fluid flow measurement. However, conventional signal processing methods, namely amplification, shaping, filtering, and counting, cannot effectively measure small flow rates, have limited range ratios, and cannot guarantee on-site measurement accuracy. At the same time, some applications require low-power, two-wire instruments that output 4-20mA DC current, that is, from an electrical point of view, there are only two wires connecting the instrument to the outside, and the power line and signal line are multiplexed. 24V (or 12V) DC power supply, and the DC power supply is connected in series with the sampling (load) resistor. 4mA ...

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Application Information

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IPC IPC(8): G01F1/32G01F15/06H03F3/70H03H7/06H03K5/01
Inventor 徐科军曾宪俊朱志海刘三山周杨黄云志刘家祥
Owner HEFEI UNIV OF TECH
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