Surface Absorptance Without Radiant Emittance

In summary, surface absorptance without radiant emittance is a measure of the amount of radiation that is absorbed by a material without taking into account the amount of radiation that is emitted by the material. It is typically expressed as a percentage and is important in understanding the energy balance of a material. This measurement is typically done through experiments in a controlled environment, and factors such as material composition, texture, and color, as well as environmental conditions, can affect the absorptance. It is crucial in materials science for applications such as solar energy, thermal insulation, and heat transfer. It differs from surface absorptance with radiant emittance, which takes into account both absorbed and emitted radiation, and can lead to different values for the same material.
  • #1
j1230
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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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  • #2
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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