Method for measuring thermal conductivity

A technology of thermal conductivity and thermal pulse, which is applied in the field of measuring the thermal conductivity of materials, can solve the problems of long measurement time and achieve the effect of low effort

Inactive Publication Date: 2014-09-10
SGL CARBON SE
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Problems solved by technology

Furthermore, most of them require long measurement times and/or can only be performed in a laboratory environment rather than in an ind...

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  • Method for measuring thermal conductivity
  • Method for measuring thermal conductivity
  • Method for measuring thermal conductivity

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Embodiment Construction

[0032] The following description is merely exemplary in nature and is not intended to limit the present invention, application, or use. It should be understood that throughout the drawings, corresponding reference numbers indicate similar or corresponding components and features.

[0033] In order to measure the thermal conductivity of an isotropic or anisotropic medium or material, a heat source, especially a laser, is used to apply a heat pulse to the flat front side of the material to generate a temporarily preferred spot or hot spot on the material. The front side is the side of the material on which the heat pulse is applied, especially the side facing the heat source. Generally, each side of the material is qualified as a front side. The inventors of the present invention have found that it is assumed that a semi-infinite medium or material has an insulating surface that is temporarily heated at a point-like position and that the material (especially an orthotropic materia...

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Abstract

A method for measuring thermal conductivity of a material contains the now described steps. A heat pulse is applied to a front side of the material. The resulting time-dependent two-dimensional temperature field of the front side of the material is detected using an infrared detector. An isotherm is identified in the temperature field. First and second thermal conductivities of the material in first and second directions of the material are calculated on the basis of the shape of the isotherm and on the basis of first and second temperatures detected at one point of the front side of the material at two points in time.

Description

Technical field [0001] The invention relates to a method for measuring the thermal conductivity of materials. Background technique [0002] The statements in this section only provide background information related to the present invention and may not constitute prior art. [0003] Thermal conductivity is the ability of a material to conduct heat. The measurement of thermal conductivity plays a major role in the analysis of materials in many different industries (such as the automotive industry, the chemical industry, the electronics industry, and construction). In the heat accumulator, for example, a material having high thermal conductivity can be used. However, thermal shielding requires low thermal conductivity. The statement of the prior art for measuring thermal conductivity is described by H. Czichos, T. Saito and L. Smith (Eds.) in "Handbook of Materials Measurement Methods", 2006, Springer, pp. 399-408. There are three basic methods that can be used to measure thermal ...

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Application Information

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IPC IPC(8): G01N25/18
CPCG01N25/18G01N25/20
Inventor 沃伊切赫·亚当齐扎克理夏德·比亚韦茨基塔德兹·克鲁切克
Owner SGL CARBON SE
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