How to measure emissivity of hot (~1000 centigrade) objects

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SUMMARY

This discussion focuses on measuring the emissivity of hot ceramic materials at approximately 1000 degrees Celsius, specifically in the wavelength range of 1 to 10 micrometers. Traditional methods using FTIR spectrometers are unsuitable due to the risk of damage from high temperatures. The suggested alternative involves using high-temperature IR thermometers, such as those from Omega, which can measure temperatures up to 1800 degrees Celsius, providing a practical solution for accurate emissivity measurement.

PREREQUISITES
  • Understanding of emissivity and absorptivity concepts
  • Familiarity with FTIR spectrometry
  • Knowledge of high-temperature measurement techniques
  • Experience with infrared thermometers
NEXT STEPS
  • Research the specifications and features of Omega high-temperature IR thermometers
  • Explore alternative methods for measuring emissivity in high-temperature environments
  • Investigate the use of integrating spheres in emissivity measurements
  • Learn about the calibration techniques for high-temperature infrared thermometers
USEFUL FOR

Materials scientists, thermal engineers, and researchers involved in high-temperature measurements and emissivity analysis of ceramic materials.

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I want to measure the emissivity (or more correctly the absorbtivity) in the wavelength range 1 - 10 micrometer of very hot (~1000 degrees celsius) ceramic materials. At room temperature this is typically done using an FTIR spectrometer with a gold coated integrating sphere. But for very hot objects the spectrometer would burn! Any ideas of how such emissivity measurement can be performed in a practical, yet accurate, way? I have access to varius furnaces.
 
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