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Error correction-based implementation method for permanent magnet type sodium flowmeter cross-correlation method in-situ calibration

An error correction, in-situ calibration technology, applied in testing/calibration devices, liquid/fluid solids measurement, testing/calibrating volume flow, etc. Simple steps to implement

Active Publication Date: 2021-06-22
CHONGQING CHUANYI AUTOMATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the traffic is different, the frequency bands of the cross-correlation traffic close to the standard traffic are in different frequency bands. Therefore, different signal frequency bands need to be selected, which leads to a certain complexity in the implementation process.

Method used

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  • Error correction-based implementation method for permanent magnet type sodium flowmeter cross-correlation method in-situ calibration
  • Error correction-based implementation method for permanent magnet type sodium flowmeter cross-correlation method in-situ calibration
  • Error correction-based implementation method for permanent magnet type sodium flowmeter cross-correlation method in-situ calibration

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Embodiment Construction

[0024] The present invention will be further described below with reference to the drawings.

[0025] The design idea of ​​the present invention is that the instantaneous speed V of a certain position in the conduit can be decomposed into average speed. And speed pulsation V ', ie

[0026]

[0027] In the in situ calibration, the electrical signal U (t) collected by the cross-correlation method is an AC signal generated by turbulent pulsation, which is an overlay of different position velocity pulsation signals on the conduit cross section, ie:

[0028]

[0029]

[0030]In the formula, V '(t, r, θ) is a speed fluctuation fluctuation of a certain point (R, θ) on the T hour conduit cross section, 0 ≤ R ≤ D / 2, 0 ≤ θ ≤ 2π; b (r, θ) It is a magnetic flux density; W (r, θ) is a weight function, indicating the degree of contribution of the potential difference between the different position speed fluctuations in the conduit, is a spatial function related to the size, geometric s...

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Abstract

The invention relates to an error correction-based implementation method for permanent magnet type sodium flowmeter cross-correlation method in-situ calibration. According to the method, from the perspective of repeatability error correction, the repeatability error of low-frequency-band signals affecting overall signals is obtained through qualitative analysis and quantitative calculation, and therefore the repeatability error is corrected from the perspective of low-frequency filtering; three key technologies are combined, so that the repeatability error correction effect is optimal; after the repeatability error is corrected, software correction can be conducted on the nonlinear error through a quadratic function model, and therefore in-situ calibration of the permanent magnet type sodium flowmeter of a large-diameter vortex-free generator in a long straight pipe section is completed.

Description

Technical field [0001] The present invention relates to the field of flow detection, in particular, a method of realizing the in situ calibration of permanent magnet sodium flow meter based on error correction. Background technique [0002] In the sodium cold fast heiler, the flow of coolant-liquid metal sodium is measured frequently with permanent magnet sodium flow meter (PSMF). Permanent magnet sodium flow meter is based on the Fara-smelial magnetic induction, and the direct influenza electromotive force is picked up by mounting two electrodes on the axis of the flow direction and the direction of the magnetic field. The size of the induction electromotive force reflects the size of the fluid flow rate, ie Where D is the inner diameter of the pipe, B is a magnetic flux density, k 1 Is a correction coefficient of the wall shunt effect caused by pipe conductivity, k 2 It is a correction coefficient of the magnetic pole end surface shunt effect. It is average flow rate, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F25/00
CPCG01F25/10Y02E30/30
Inventor 徐科军于新龙黄雅吴文凯
Owner CHONGQING CHUANYI AUTOMATION
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