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Strong interference resistant digital vortex shedding flowmeter based on double sensors

A vortex flowmeter and dual-sensor technology, applied in the direction of volume/mass flow generated by mechanical effects, through detection of dynamic effects of fluid flow, etc., can solve the problems of no signal and noise templates, and difficult to obtain noise templates. Achieve the effect of eliminating the interference of strong noise and ensuring the measurement accuracy

Active Publication Date: 2013-01-23
HEFEI UNIV OF TECH +1
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  • Application Information

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Problems solved by technology

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

Method used

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  • Strong interference resistant digital vortex shedding flowmeter based on double sensors
  • Strong interference resistant digital vortex shedding flowmeter based on double sensors
  • Strong interference resistant digital vortex shedding flowmeter based on double sensors

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] 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't get the correct measurement result. Dual sensors are used, and an algorithm combining frequency domain subtraction and frequency variance calculation is used to eliminate its influence on the flowmeter. When measuring the flow rate, one sensor senses the flow signal and vibration noise (hereinafter referred to as the flow sensor), and the other sensor senses the vibration noise and weak flow signal (hereinafter referred to as the vibration sensor). The two sensors are connected by connecting rods, but...

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Abstract

The invention relates to the field of flow rate detection, in particular to a strong interference resistant digital vortex shedding flowmeter based on double sensors, using a microprogrammed control unit (MCU) as a core. An instantaneous frequency is calculated by a method combining subtracting frequency domain subtraction and calculating frequency variance, switch is carried out according to different conditions on site, information of the flow rate and vibrating noise are judged, the information of the flow rate is extracted, a correct vortex shedding flow rate signal frequency can be stillobtained even though correct vortex shedding flow rate signal energy is less than noise energy. Therefore, the invention can remove the interference of strong noise and ensure the site measuring precision.

Description

technical field [0001] The invention relates to the field of flow detection, and relates to a vortex flowmeter, in particular to an anti-strong interference digital vortex flowmeter with a single-chip microcomputer (MCU) as the core and based on dual sensors. Background technique [0002] When the vortex flowmeter is used in industrial field measurement, because the pipeline is connected with equipment such as water pumps, valves and motors, the flowmeter is often disturbed by mechanical vibration. In some cases, the energy of mechanical vibration noise is relatively large, sometimes even greater than the energy of the vortex flow signal, and its frequency is within the frequency range of the vortex flow signal. In view of this situation, it is difficult to extract the vortex flow information from the noise by using the usual spectrum analysis, because the premise of the usual spectrum analysis is that the energy of the flow signal is greater than the noise energy. For this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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