I Surface Absorptance Without Radiant Emittance

AI Thread Summary
To determine the surface absorptance of a material without knowing its radiant emittance, one can illuminate the surface using a square wave modulated or pulsed light source. The reflected energy should be detected as an AC signal, allowing for analysis of the surface's response. The DC output measured will correspond to the emittance of the material. This method enables the calculation of absorptance by isolating the effects of emittance. Accurate measurements can lead to a better understanding of material properties in thermal applications.
j1230
Messages
1
Reaction score
0
TL;DR Summary
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?
 
Physics news on Phys.org
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.
 

Thread 'The Physics of unloding sand from a barge'

I think it's easist first to watch a short vidio clip I find these videos very relaxing to watch .. I got to thinking is this being done in the most efficient way? The sand has to be suspended in the water to move it to the outlet ... The faster the water , the more turbulance and the sand stays suspended, so it seems to me the rule of thumb is the hose be aimed towards the outlet at all times .. Many times the workers hit the sand directly which will greatly reduce the water...
View full post »

Thread 'I need to simulate clothing meshes for hanging garments'

I don't need cloth simulation. I need to simulate clothing meshes. Made of triangles and I need an answer that someone with High School math can understand. I am actually using the time it takes for someone to answer to create a model with less geometry than the one I have been using. I want clothing that can be removed on a model that will be animated. I don't need stretching or wrinkles on my meshes, I just need gravity. I have an idea of how I could do it, but I don't know how to apply...
View full post »

Similar threads

I Radiant Intensity from Radiant Power and Intensity Distribution
Replies
17
Views
5K
B Why is a black surface a better emitter of IR than a silvered surface?
Replies
1
Views
1K
Construction Can a radiant barrier in the attic be effective?
Replies
26
Views
2K
I Off-angle irradiance from Radiant Intensity
Replies
7
Views
2K
I Gases: Not Required to Be Blackbodies
Replies
19
Views
17K
A Selective Surfaces for Solar Thermal Conversion
Replies
8
Views
1K
I How do emissivity and absorptivity affect thermal imaging results?"
Replies
3
Views
3K
I Questions about Jean-Rayleigh's derivation of Ultraviolet Catastrophe
Replies
1
Views
930
What Is the Relationship Between Radiant Intensity and Radiance?
Replies
13
Views
7K
I Only certain emission lines show up in absorption spectrum
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top