A Correction Method for Measurement Error of Line Array Sensor
A sensor and line array technology, applied to the field of correction of measurement errors of line array sensors, can solve problems such as inaccurate assumptions and systematic errors
Active Publication Date: 2020-09-08
SHANGHAI JIAOTONG UNIV
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However, this assumption is not accurate according to the simulation of the electric field
The sensitive body is an irregular geometry, and the assumption of uniform distribution of the sensitive body will bring systematic errors
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[0027] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0028] The current measured at each intersection point of a wire-mesh sensor can characterize the conductive phase fraction of a sensitive volume near the intersection point. In the existing processing method, it is assumed that the sensitive body is a uniformly distributed cuboid. This assumption introduces systematic errors. In the actual use of the line array sensor, this systematic error makes the proportion of the conductive phase measured in some sensitive bodies completely wrapped by the non-conductive phase greater than 0; while the proportion of the non-conductive phase in the sensitive body completely wrapped by the conductive phase is greater than 0.
[0029] The invention proposes a correction method for the error generated by the hypothesis of the line array sensor. Using this correction method can reduce the error ...
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The invention discloses a correction method of a measurement error of a linear array sensor. The method comprises the following steps of s1, assigning a cross-section conductive phase share distribution matrix B obtained by measuring two-phase flow by the linear array sensor to an intermediate matrix C; s2, simulating the linear array sensor by using the matrix C as a boundary condition in a modeof simulating an electric field of the linear array sensor to obtain a simulated measurement matrix C'; s3, judging whether the maximum difference value of corresponding elements of the matrix C' andthe matrix B is smaller than a specified threshold value or not, and if the maximum difference value is smaller than the specified threshold value, considering that the intermediate matrix C is equalto the actual conductive phase share distribution matrix A; otherwise, correcting the intermediate matrix C to obtain a corrected matrix C''; and s4, and correcting each element in the matrix C'', assigning the corrected matrix C'' to the matrix C, and returning to the step S2 until the maximum difference value of the corresponding elements of the matrix C' and the matrix B is less than the specified threshold value. The error of the linear array sensor caused by the assumption of a uniform sensitive body can be reduced to be less than 3 percent.
Description
technical field [0001] The invention relates to the technical field of two-phase flow measurement, in particular to a method for correcting measurement errors of linear array sensors. Background technique [0002] Two-phase flow is widely used in nuclear power generation, thermal power generation, oil exploration, chemical and pharmaceutical fields. In two-phase flow, the gas phase is generally the non-conductive phase and the liquid phase is the conductive phase. The linear array sensor measures the conductivity distribution of the entire flow section to infer the distribution of the conductive phase fraction. A line array sensor consists of two sets of wire meshes that are perpendicular to each other but do not touch. The metal wires in one group of meshes are called transmitting electrodes, and the metal wires in another group of meshes are called receiving electrodes. The emitting electrodes are excited sequentially, and the pulse square wave is passed through. When ...
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IPC IPC(8): G01N27/04G01R27/22G06F30/20
CPCG01N27/04G01R27/22
Inventor 顾汉洋肖瑶张亨伟刘莉
Owner SHANGHAI JIAOTONG UNIV