Anti-strong interference vortex street flowmeter digital signal processing system based on single sensor
A digital signal processing, vortex flowmeter technology, applied in the direction of volume/mass flow generated by mechanical effects, dynamic effects by detecting fluid flow, etc., can solve problems such as difficult to obtain noise templates, templates that do not explain signals and noise, etc. , to ensure the accuracy of on-site measurement and eliminate the interference of strong noise
Active Publication Date: 2010-12-08
HEFEI UNIV OF TECH +1
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However, the noise situation is various, and it is not easy to obtain all the templates of the noise
Also, the patent does not explain how to create a template for signal and noise
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[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] The design concept of the present invention is: in the industrial field, the output signal of the vortex flow sensor often contains both the vortex flow signal and the mechanical vibration noise. When the energy of the mechanical vibration noise signal is greater than the energy of the vortex flow signal, the conventional The digital signal processing method can not get the correct measurement results. Ideally, the vortex flow signal is a regular sine wave signal. However, in practice, due to the turbulence and pulsation of the flow medium in the pipeline and the instability of the flow field, the vortex generator exerts irregular additional effects on the vortex generator, so that the actual frequency of the vortex flow signal swings around the ideal frequency. The mechanical vibration noise is caused by mechanical external forces such as blowers, water pumps,...
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The invention relates to the field of flow measurement, in particular to a vortex street flowmeter digital signal processing system which takes an MCU as core and is based on a single sensor. Street flowmeter signal and mechanical vibration noise have different frequency bandwidth features, and an autocorrelation function can reflect the bandwidth feature of the signal. Frequency spectrum analysis, band pass filtering and autocorrelation calculation are carried out on the signal output by the vortex street flow sensor so as to confirm the frequency of the vortex street flow signal. Even underthe condition that the energy of vortex street flow signal is smaller than the energy of vibration noise and the frequency of the vibration noise is changeable, the invention can still exactly obtainthe frequency of the vortex street flow signal, thus eliminating the interference from strong noise and ensuring the on-site measurement preciseness of the vortex street flowmeter.
Description
technical field [0001] The invention relates to the field of flow detection, and relates to a digital signal processing system of a vortex flowmeter, in particular to a digital signal processing system of a vortex flowmeter which uses a single-chip microcomputer (MCU) as the core and is based on a single sensor to resist strong interference. Background technique [0002] Vortex flowmeters can measure liquid, gas and steam flow, and have a wide range of applications. However, in the industrial field, because the pipeline is connected with equipment such as water pumps, valves and motors, the flowmeter is often disturbed by mechanical vibration during operation, which affects the measurement of flow. The characteristics of these mechanical vibration noises are: (1) the energy is relatively large, sometimes even greater than the energy of the vortex flow signal; (2) the frequency is within the frequency range of the vortex flow signal. At present, digital vortex flowmeters use...
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IPC IPC(8): G01F1/32
Inventor 徐科军罗清林王刚刘三山康一波石磊徐银江
Owner HEFEI UNIV OF TECH