Nonlinear correction method for in-situ calibration of permanent magnet sodium flowmeter based on signal frequency band selection

A non-linear correction and in-situ calibration technology, which is applied in the direction of test/calibration device, test/calibration volume flow, liquid/fluid solid measurement, etc. It can solve the problems that the application conditions cannot be met, the sensor changes other performances, etc.

Active Publication Date: 2021-01-12
CHONGQING CHUANYI AUTOMATION
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Problems solved by technology

However, changing the magnetic field structure of the sensor may change other performances, making it unable to meet the field application conditions

Method used

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  • Nonlinear correction method for in-situ calibration of permanent magnet sodium flowmeter based on signal frequency band selection
  • Nonlinear correction method for in-situ calibration of permanent magnet sodium flowmeter based on signal frequency band selection
  • Nonlinear correction method for in-situ calibration of permanent magnet sodium flowmeter based on signal frequency band selection

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing, the present invention will be further described.

[0029] figure 1 It is the electrode distribution diagram of DN150 PMSF for in-situ calibration. The 1-1 and 1-2 electrodes measure one signal (hereinafter referred to as "1-1 group", other electrodes are similar), and are respectively located above and below the 45° direction of the pipeline. The electrodes are welded vertically, and other electrodes are the same. Group 1-1 electrodes are located 25mm downstream of the centerline of the magnetic steel, Group 2-1 is located 112.5mm downstream of Group 1-1, and Group 1-1 and Group 2-1 electrodes are a pair of electrodes for cross-correlation measurement.

[0030] figure 2 It is the non-linear characteristic between the cross-correlation flow and the standard flow obtained by using the signal in the whole frequency range (0-40Hz). The two signals collected by the 1-1 group and the 2-1 group of electrodes are removed from ...

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Abstract

The invention discloses a nonlinear correction method for in-situ calibration of a sodium flowmeter based on signal frequency band selection. The nonlinear correction method is used for correcting nonlinear characteristics of a permanent magnet type sodium flowmeter of a large-diameter vortex-free generator in in-situ calibration. The method is based on a physical model of pipeline cross section turbulence distribution, and nonlinear correction is achieved by searching for an area with cross-correlation flow close to standard flow, namely a frequency band with signal frequency band cross-correlation flow close to standard flow. Cross-correlation flow curves of different frequency signals are obtained through phase-frequency characteristics of cross-power spectral density, two different correction frequency bands are selected in a large flow range and a small flow range through FFT digital filtering, and cross-correlation flow is calculated by using signals in the two correction frequency bands when large flow and small flow are carried out. A linear fitting relational expression of the cross-correlation flow and the standard flow is obtained, and correction of nonlinear characteristics is realized.

Description

technical field [0001] The invention relates to the field of flow detection, in particular to a non-linear correction method for in-situ calibration of a permanent magnet sodium flowmeter based on signal frequency band selection. Background technique [0002] Permanent magnet sodium flowmeter (PSMF) is commonly used to monitor the flow of liquid metal coolant sodium in fast reactors. The permanent magnet sodium flowmeter operates in the stack for a long time, and will be affected by environmental factors such as high temperature and radiation, and its magnetic flux density will decrease, resulting in a decrease in the induced electromotive force (EMF) output, resulting in flow measurement errors. Therefore, regular calibration of the permanent magnet sodium flowmeter in the stack is required. The permanent magnet sodium flowmeters installed in the stack are not easy to disassemble, and some permanent magnet sodium flowmeters installed in special pipelines, such as bypass in...

Claims

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Application Information

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