Ultrahigh-temperature thermal diffusivity measuring device

A measuring device and diffusivity technology, which is applied in the field of thermal diffusivity measuring devices for ultra-high temperature materials, can solve the problems of low upper limit of thermal diffusivity measurement temperature, and achieve accurate measurement results

Pending Publication Date: 2022-04-08
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Claims
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Problems solved by technology

[0006] To overcome the problem of low upper limit of thermal diffusivity measurement temperature in the prior art, the main purpose of the present invention is to provide an ultra-high temperature thermal d

Method used

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  • Ultrahigh-temperature thermal diffusivity measuring device

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Embodiment 1

[0025] Such as figure 1 As shown, an ultra-high temperature thermal diffusivity measurement device disclosed in this embodiment includes a pulse excitation system, a high temperature heat source system, a rapid measurement system based on radiation energy and a computer 23, wherein the pulse excitation system is located below the high temperature heat source system, and the pulse excitation system The high-temperature heat source system is isolated from the high-temperature heat source system through the quartz window 7, the radiation energy-based measurement system is located above the high-temperature heat source system, and the radiation energy-based rapid response system is isolated from the high-temperature heat source system through the CaF window 17. The response system based on radiation energy is connected with a computer 23 through 20 .

[0026] The pulse excitation system includes a laser 1, an optical fiber 2, a collimating lens 3, a focusing lens 4, and a mirror 6...

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Abstract

The invention discloses an ultrahigh-temperature thermal diffusivity measuring device, and belongs to the technical field of thermal metering. The device comprises a pulse excitation system, a high-temperature heat source system, a radiation energy-based rapid measurement system and a data processing system. The high-temperature heat source system heats a pyrolytic graphite heating body under a sealed vacuum condition to provide an ultra-high-temperature environment for a sample, in addition, the pulse excitation system is matched with a uniform laser source, focuses the laser source and collimates a focused light beam to adjust the size of a laser spot, and a laser wave band is filtered based on a filter to prevent transmission laser from puncturing an infrared detector; the filter can completely penetrate through the wave band of the infrared detector to enable the infrared detector to completely record a temperature rise signal of the sample; the light condensing sheet is positioned above the filter sheet, so that the infrared detector can rapidly record the temperature rise of the sample in a non-contact manner without recording the change of the ambient temperature, the accurate measurement of the thermal diffusivity under the ultra-high temperature condition can be realized, and the thermal diffusivity measurement temperature is increased to be more than 3000 DEG C.

Description

technical field [0001] The invention belongs to the technical field of thermal measurement and relates to a device for measuring thermal diffusivity of ultra-high temperature materials. Background technique [0002] The thermal diffusivity of materials is one of the thermophysical parameters of materials, the main index that determines heat exchange in the unsteady heat transfer process, and the key parameter for basic research, analysis calculation and engineering design of specific thermal processes. [0003] Hypersonic vehicles, aerospace engines, and future aircraft and other types of weapons will undergo varying degrees of unsteady aerodynamic heating stages during launch, orbit, and flight. The temperature sometimes reaches thousands of degrees Celsius. Therefore, effective thermal control must be adopted. The heat insulation and heat protection of the aircraft thermal barrier material and the thermal diffusivity of important component materials are important parameter...

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Application Information

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IPC IPC(8): G01N25/20
Inventor 周杨杨新圆唐亚曼蔡静董磊
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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