Solid material thermal diffusion coefficient measuring device and measuring method thereof

A technology of thermal diffusivity and solid materials, which is applied in the field of measuring the thermal properties of solid materials, and can solve the problems that the pressure regulation cannot be carried out in real time, the accuracy is low, and it is not suitable for measuring materials.

CN105301044AInactive Publication Date: 2016-02-03XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-02-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a solid material thermal diffusion coefficient measuring device and a measuring method thereof, and relates to the technical field of measurement of thermal physical property of solid materials. The solid material thermal diffusion coefficient measuring device comprises a heating device, a loading device, an infrared detector, a computer control and collecting system, a stepped motor control system and a pressure display device, wherein the loading device is arranged just above the heating device, and is provided with a support plate, a force applying plate, connecting pieces, testing holes and pressure sensors; the loading device is provided with at least three connecting pieces which are symmetrically distributed, the upper end of each connecting piece is fixedly connected with the force applying plate, and the lower end of each connecting piece is fixedly connected with the support plate; each pressure sensor is arranged at the bottom part of the corresponding connecting piece, and the testing holes are respectively formed in the centers of the force applying plate and the support plate; the infrared detector is arranged just above the loading device; the signal input end of the computer control and collecting system is connected with the signal output end of the infrared detector; the signal input end of the pressure display device is electrically connected with the signal output end of each pressure sensor.
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Description

technical field

[0001] The invention relates to the technical field of measuring thermal physical properties of solid materials, in particular to a measuring device and a measuring method for thermal diffusivity of solid materials based on a laser flash method. Background technique

[0002] At the same temperature, the thermal conductivity of a material is the product of thermal diffusivity, density, and specific heat capacity. Specific heat capacity and density are the properties of the material itself, and the test method is very mature. Therefore, as long as the thermal diffusivity of the material is measured, the thermal conductivity can be determined. The thermal diffusivity characterizes the heat transfer ability of materials, and has important uses in the fields of materials, energy, construction, aviation, chemical industry, refrigeration engineering, etc., especially in engineering thermal design and system safety analysis. application. Its test method has also be...

Examples

Embodiment Construction

[0029] see figure 1 and 2 , The measuring device described in this embodiment includes a heating device 1, a loading device 2, an infrared detector 3, a computer control and acquisition system 4, a stepping motor control system 5, and a pressure display device 6, wherein:

[0030] The heating device 1 uses an infrared laser with a wavelength of 1064nm to temporarily and uniformly heat the lower surface of the sample. During the test, it is necessary to ensure that the axis of the infrared laser coincides with the axis of the loading device 2, so as to ensure that the infrared laser can vertically heat the sample.

[0031] The connector 7 of the loading device 2 is connected with the stepper motor control system 5 through an electrical signal, and is used to receive the output electrical signal of the stepper motor control system 5. The pressure sensor 11 at the bottom of the connector 7 is connected with the pressure display device 6 through a circuit, It is used to display ...