Ultrahigh-temperature thermal diffusivity measuring device

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...

AI Technical Summary

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 diffusivity measurement device, which can realize accurate measurement of thermal diffusivity under ultra-high temperature conditions, and increase the thermal diffusivity measurement temperature upper limit

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