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Anti-strong fixed interference digital signal processing system of vortex street flowmeter

A technology of digital signal processing and vortex flowmeter, which is applied in the direction of volume/mass flow generated by mechanical effects, and by detecting the dynamic effects of fluid flow. speed effect

Inactive Publication Date: 2009-07-08
HEFEI UNIV OF TECH
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Problems solved by technology

If the amplitude of the frequency to be notched is limited to zero, because this frequency is within the frequency range of the flow signal, the flow signal may be removed, and the flow rate cannot be reflected.

Method used

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  • Anti-strong fixed interference digital signal processing system of vortex street flowmeter
  • Anti-strong fixed interference digital signal processing system of vortex street flowmeter
  • Anti-strong fixed interference digital signal processing system of vortex street flowmeter

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] The overall structural block diagram of system hardware of the present invention is as figure 1 shown. The system of the present invention consists of a vortex street sensor, a charge amplifier, a passive low-pass filter, a limiting amplifier, an active low-pass filter, a voltage follower, a power supply module, a DSP chip, an LCD module, a keyboard module, a communication module, EEPROM, active crystal oscillator.

[0052] The working process of the system of the present invention is as follows: the weak charge signal output from the vortex sensor is first converted into a voltage signal through the charge amplifier. Since the signal amplitude is small and contains a lot of noise, it passes through a low-pass filter circuit and a limiting amplifier circuit. In order to avoid the impact of signal saturation on the circuit and signal frequency calculation, a l...

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Abstract

The invention relates to the field of flow detection and provides an anti-strong fixed interference digital signal processing system of a vortex flowmeter, which comprises a vortex flow sensor, a charge amplifier, a passive low pass filter, a limiting amplifier, an active low pass filter, a voltage follower, a power supply module, a DSP chip, an LCD module, a keyboard module, a communication module, an EEPROM and an active crystal oscillator. The system processes the output signal of the vortex flow sensor by using a method of notch filtering and FFT-based power spectrum analysis and carries out spectral calibration, acceleration algorithm, limiting filtering and average treatment after obtaining the frequency of the vortex signal so as to eliminate the influences of strong fixed interference and obtain the value of the frequency of the vortex signal quickly and accurately.

Description

technical field [0001] The invention relates to the field of flow detection, and is a digital signal processing system of a vortex flowmeter, in particular, a vortex flow meter with a digital signal processor (DSP) as the core and a combination of periodic map analysis and notch filter to resist strong fixed interference. Street flow meter digital signal processing system. Background technique [0002] The FFT-based power spectrum analysis method processes the output signal of the vortex flow sensor, and can effectively extract the vortex flow information from the noisy sensor output signal. Compared with the conventional amplification, filtering, shaping and counting methods, it can Expand turndown ratio and ensure on-site measurement accuracy. Since this method determines the frequency of the vortex signal based on the principle of maximum energy, it is considered that in the output signal of the sensor, the frequency corresponding to the maximum spectral energy is the fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/32
Inventor 徐科军朱志海刘三山姜鹏
Owner HEFEI UNIV OF TECH
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