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Vortex shedding flow meter based on self-adaptive fast Fourier transformation

A technology of Fourier transform and vortex flowmeter, which is applied in the direction of volume/mass flow generated by mechanical effects, and through the detection of dynamic effects of fluid flow, etc. It can solve the problem of high resolution and threshold voltage that cannot meet the requirements of system software and hardware Problems such as variable parameters and low instrument resolution can be achieved to achieve accurate pulse signals, improve measurement accuracy and sensitivity, and expand the range ratio

Inactive Publication Date: 2012-11-07
HANGZHOU DIANZI UNIV
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Problems solved by technology

In addition, when the vortex signal is shaped into a pulse signal preprocessing, it is usually realized by using a Schmitt trigger circuit, but a single threshold voltage cannot meet the requirements of system software and hardware variable parameters
[0004] At present, the method based on fast Fourier transform power spectrum analysis has been successfully applied in this technical field, but the minimum resolvable frequency is a fixed value in the entire range area, which leads to low resolution of the instrument at low flow rate and high resolution at high flow rate The problem

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  • Vortex shedding flow meter based on self-adaptive fast Fourier transformation
  • Vortex shedding flow meter based on self-adaptive fast Fourier transformation
  • Vortex shedding flow meter based on self-adaptive fast Fourier transformation

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] The vortex flowmeter of the present invention is an improved front-stage analog signal processing circuit, an STM32 embedded processor based on the ARM Cortex-M3 core, and a low-power intelligent vortex flowmeter using an adaptive fast Fourier transform analysis method . The flowmeter can effectively extract very weak vortex signal in the background of low flow rate and large noise, and can automatically change the threshold voltage of the Schmitt trigger according to the magnitude of the noise, and change the amplitude of the amplifying circuit according to the magnitude of the vortex signal. Gain, changing the sampling frequency of ADC according to the frequency of the vortex signal, which can effectively expand the range ratio of the instrument and improve the measurement accuracy. In terms of software algorithm, the algorithm based on adaptive FFT can reali...

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Abstract

The invention relates to a vortex shedding flow meter based on self-adaptive fast Fourier transformation, which comprises a charge amplifier, a first filter, a program-controlled voltage amplifier, a second filter, a program-controlled scmitt trigger, a bias voltage circuit, a singlechip computer, an LDO (Low Dropout Regulator) circuit, a reset circuit, a key input, a 4-20mA output circuit and anLCD (Liquid Crystal Display) circuit. A signal generated by a vortex shedding sensor is connected with the charge amplifier; the output of the charge amplifier is connected with the first filter; theoutput of the first filter is connected with the program-controlled voltage amplifier; the output of the program-controlled voltage amplifier is connected with the second filter; the output of the second filter is divided into two paths, wherein one path is connected with the singlechip computer; the other path is connected with the program-controlled scmitt trigger; and the program-controlled scmitt trigger is connected with the singlechip computer. According to the vortex shedding flow meter disclosed by the invention, various noises can be effectively inhibited and low-flow and high-precision measurement is realized, thereby the measuring range ratio is enlarged and the measuring precision and the sensitivity are improved.

Description

technical field [0001] The invention belongs to the technical field of electronic detection, mainly relates to a signal processing circuit and digital signal processing technology, and is a stress-type piezoelectric vortex flowmeter, especially a single-chip microcomputer (MCU)-based self-adaptive fast Fourier flowmeter. Signal processing system for stress-type piezoelectric vortex flowmeter with transform (FFT) power spectrum analysis. Background technique [0002] The stress-type vortex flowmeter based on the Karman vortex street principle has developed rapidly since it appeared in the late 1970s because of its high sensitivity, good stability, and low price. At present, most of the vortex flowmeters integrate the primary instrument and the secondary instrument, and are developing in the direction of integration and intelligence. However, the current smart vortex flowmeters in my country generally have the problems of undetectable signals and serious vibration and noise e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32
Inventor 秦会斌江文斌邵李焕郑梁
Owner HANGZHOU DIANZI UNIV
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