Device for measuring thermal diffusivity

Abstract

The invention provides a device for measuring a thermal diffusivity. The device comprises an excitation light source, an optical control device, a vacuum heating furnace, a temperature controlling device, a temperature measuring device and a data acquiring and processing device, wherein the excitation light source generates excitation light beams; the optical control device is provided with an optical component group, a light beam mass spectrometer and an energy meter and regulates the energy of the excitation light beams through a replaceable optical element in the optical component group; a heating element for heating a sample is arranged in the vacuum heating furnace; the temperature controlling device is used for controlling the heating temperature of the vacuum heating furnace; the temperature measuring device amplifies a temperature rise signal of the sample measured by a detector through a pre-amplifier and transmits the amplified signal to the data acquiring and processing device; the data acquiring and processing device comprises a data acquiring system and a data processing system; the data acquiring system transmits all acquired data signals to the data processing system; and the data processing system analyzes and repeatedly and theoretically corrects the data signals. The device for measuring the thermal diffusivity designed by the invention has the advantages of reducing the measuring repeatability of the thermal diffusivity of a material to be less than 1 percent, lowering uncertainty of measurement, improving the level of thermal diffusivity measurement and laying foundations for the establishment of a standard thermal diffusivity device in China, the preparation of a standard thermal diffusivity substance and the establishment of a standard thermal diffusivity database.

Description

technical field [0001] The present invention relates to a thermal diffusivity measurement device, more particularly to a device for measuring the thermal diffusivity of solid materials by laser flash method. Thermal diffusivity and thermal conductivity are three thermophysical parameters. Background technique [0002] The thermal physical properties of materials, including thermal conductivity, thermal diffusivity, specific heat, thermal expansion coefficient, emissivity and reflectivity of thermal radiation of materials, etc., are important characteristic quantities that characterize the properties of materials. High-tech fields such as effective utilization of energy, nuclear energy technology, and new material development, as well as many industrial fields such as petrochemical industry, iron and steel metallurgy, building energy conservation, refrigeration and air conditioning, etc., have obvious scientific significance and important engineering application value. [00...

AI Technical Summary

Problems solved by technology

So far, there is no international standard for thermal physical property measurement, and the relative standard uncertainties of various thermal physical property measurements are relatively high, about 10 -2 about

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