Surface Absorptance Without Radiant Emittance

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SUMMARY

The discussion focuses on determining the surface absorptance of a material without the radiant emittance of a non-black body. The recommended method involves illuminating the surface with a square wave modulated or pulsed source and synchronously detecting the reflected energy as an AC signal. The DC output obtained will be attributed to the emittance of the body, allowing for accurate calculations of absorptance.

PREREQUISITES
  • Understanding of surface absorptance and radiant emittance concepts
  • Knowledge of square wave modulation techniques
  • Familiarity with synchronous detection methods
  • Basic principles of AC and DC signal analysis
NEXT STEPS
  • Research square wave modulation techniques for material testing
  • Learn about synchronous detection methods in optical measurements
  • Study the relationship between AC signals and surface properties
  • Explore advanced techniques for measuring radiant emittance
USEFUL FOR

Material scientists, optical engineers, and researchers involved in thermal properties analysis and surface characterization of materials.

j1230
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TL;DR
surface absorption
how can I go about finding the surface absorptance of a material if I'm not given the radiant emittance of the non- black body?
 
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Illuminate the surface with a square wave modulated or a pulsed source.
Then synchronously detect the reflected energy as an AC signal.
The DC output will be due to emittance of the body.
 
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