A Measurement Method of Digital Vortex Flowmeter Against Vibration Interference

A vortex flowmeter, anti-vibration interference technology, applied in volume measurement, liquid/fluid solid measurement, volume/mass flow generated by mechanical effects, etc., can solve problems such as signal processing methods for anti-vibration interference, etc. To achieve the effect of improving the measurement accuracy

Active Publication Date: 2018-02-13
合肥科迈捷智能传感技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this document does not give a specific signal processing method for anti-vibration interference.

Method used

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  • A Measurement Method of Digital Vortex Flowmeter Against Vibration Interference
  • A Measurement Method of Digital Vortex Flowmeter Against Vibration Interference
  • A Measurement Method of Digital Vortex Flowmeter Against Vibration Interference

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Embodiment Construction

[0036] see figure 1 , the structural form of the digital vortex flowmeter probe anti-vibration interference in this embodiment is: a piezoelectric device is arranged in a probe housing 11, and the piezoelectric device is on a piezoelectric stem 22a, with an above A rectangular upper piezoelectric sheet 22b and a rectangular lower piezoelectric sheet 22c are arranged at intervals in a "string" shape, and a counterweight 33 is arranged at the top or bottom of the piezoelectric stem 22a; in the piezoelectric stem 22a, The rectangular upper piezoelectric sheet 22b and the rectangular lower piezoelectric sheet 22c respectively lead out the common signal line 44a, the noise pickup signal line 44b and the flow signal line 44c;

[0037] The measurement method of the vortex flowmeter in the present embodiment is to carry out as follows:

[0038] Step 1: Amplify and filter the analog signal output in the noise pickup signal line 44b and the flow signal line 44c and perform ADC sampling t...

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PUM

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Abstract

The invention discloses a measurement method of a digital vortex flowmeter which is anti-vibration and interference. For the vortex flowmeter probes respectively leading out public signal lines, noise pickup signal lines and flow signal lines, the measurement method is to complete the flow signal After sampling and noise signal and spectrum analysis, any peak in the energy spectrum obtained by spectrum analysis is effectively judged, and then the effective peak value of the flow signal and the effective peak value of the noise signal are matched; according to the matching result, the high-frequency component ratio algorithm is selected or the flow Signal saturation judgment, when the flow signal is not saturated, use the energy ratio method, and use the flow signal frequency corresponding to the maximum value of the energy ratio as the vortex frequency; when the flow signal is saturated, use the frequency corresponding to the maximum energy peak value of the flow signal as the frequency. Vortex frequency. The method of the invention is applied to the vortex flowmeter, effectively improving the anti-interference ability and sensitivity of the vortex flowmeter.

Description

technical field [0001] The invention relates to the technical field of flow detection, and relates to a measurement method of a vortex flowmeter, in particular to a digital vortex flowmeter measurement method using a three-wire probe and anti-vibration interference. Background technique [0002] As a fluid oscillating flowmeter, the vortex flowmeter can not only feel the vortex force on the sensor, but also other forces on the sensor, such as the vibration force transmitted by the pipeline and the impact force of the pipeline fluid. The superposition of these external vibration forces and vortex street forces will cause vibration and noise interference to the vortex street signal. In some cases, the energy of the vibration noise is relatively large, even greater than the energy of the vortex signal, and the vibration frequency is within the frequency range of the vortex signal. In view of this situation, neither the common time-domain pulse counting method nor the frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/32G01F15/00
Inventor 冯超顾宇叶寒生
Owner 合肥科迈捷智能传感技术有限公司
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