Rapid Determination of Spectral Directional Emissivity of Infrared Stealth Materials at High Temperature with Laser Heating

A novel laser heating method to heat specimen rapidly and uniformly to1800K in spectral directional emissivity of infrared stealth materials measurement is proposed, and a measurement system is developed based on this method. The measurement system is mainly composed of a laser heating device, a specimen heating bin, a reference blackbody, and a infrared spectrum radiation detecting device. The spectral directional emissivities of one kind of aluminum alloy specimen at room temperature and high temperature are measured using the measurement system, every measurement is completed in 3 minutes. The results indicate that spectral directional emissivity of infrared stealth materials at high temperature can be measured using the measurement system rapidly and accurately.