Method for measuring heterogeneous content of finite thickness material on basis of virtual heat source principle

Abstract

The invention provides a method for measuring the heterogeneous content of a finite thickness material on the basis of the virtual heat source principle, and belongs to the technical field of materialdetection and analysis. The method is characterized in that the virtual heat source principle is used to improve the traditional heat impulse method to measure the heterogeneous content; and infinitevirtual heat sources with two different strengths are established to compensate the heat dissipation effect of the heat dissipation outer boundaries of the two sides of the finite thickness (sheet-shaped) measured material, and the volume heat capacity and the heterogeneous content of the measured material are obtained by matching, optimizing and resolving four parameters. The heat transfer modelused in the method takes a full consideration of the heat dissipation effect of the heat dissipation outer boundaries of the two sides of a heat transfer medium at the same time, the requirement on the boundary dimension of the measured material is only the finite thickness panel shaped material, and the length dimension of the material in the thickness direction is not required; and the method does not limit the heat dissipation condition of the two heat dissipation boundaries of the measured material. Therefore, the proposal of the method solves the problem of accurate measurement of the heterogeneous content of the thickness-insufficient sheet shaped measured material.

Description

technical field [0001] The invention belongs to the technical field of material detection and analysis, and relates to a method for measuring heterogeneous content of materials with a limited thickness based on the principle of a virtual heat source. Background technique [0002] The intrusion of foreign components in the material can change the properties of the material itself. For example, after the porous insulation material in the building wall absorbs water, its thermal insulation and noise reduction performance will be greatly reduced, and mildew and corrosion will be induced, which will lead to increased building energy consumption and shortened service life. Therefore, the measurement of material heterogeneity content is an extremely necessary means and technology that human beings need to master. There are many methods and related studies on the measurement of material heterogeneity content, especially the measurement method of material moisture content, but there...

AI Technical Summary

Problems solved by technology

However, in actual use, most of the measured materials are in the shape of thin plates, such as the insulation material in the building wall, its thickness is limited and there are two parallel outer boundaries. In the process of using the heat pulse method, the heat dissipation effect of the outer boundaries is unknown. and cannot be ignored

Existing methods and technologies cannot solve the problem of heterogeneous content measurement of plate-shaped materials with insufficient thickness

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