Skip to main content

Coat/Scatter "Face is" meaning

  • February 15, 2025
  • 1 reply
  • 31 views

mocquin

In the docs: 

The Setup Tab > Editors Group (Setup Tab) > Non-sequential Component Editor > Object Properties (non-sequential component editor) > Coat/Scatter

the “Face is” description is : 

Face Is This setting controls whether the face is refractive, reflective, or absorbing. The following options are available:

  • “Object Default” means the face is either refractive, reflective, or absorbing, depending upon the material type defined in the NSC Editor.

  • “Reflective” means the face is always reflective. The transmitted part of the light is ignored. “Reflective” assumes the surface is coated with a thick layer of aluminum, with an index of refraction of 0.7-7.0i (at 0.55um). The layer is assumed to be thick enough that no light propagates past the layer.

  • “Absorbing” means the face is always absorbing.

 

I tried playing aournd with those parameters by setting it on a rectangular volume front face with a detector behing and a detector at 45° and a source ray at 45° incident angle with a single wavelength at 10µm , and found that : 

  • Face is Object default, no coating, no scattering : all power goes through
  • Face is Object default, SPLIT (50/50) coating, no scattering: .5W on each detector
  • Face is Reflective with no coating, no scattering: no hit behind the volume in transmission, a about .94W in reflection (so the aluminium I guess)
  • Face is Reflective with SPLIT coating, no scattering: 0W transmitted, .5W reflected (so no more alumnium!!)
  •  Fase is Absorbing (coating disabled): 0W on each detector

 

Did this topic help you find an answer to your question?

1 reply

mocquin
  • Author
  • Visible
  • 20 replies
  • February 16, 2025

Now I’d like to udnerstand what happens if I set the Face to Object Default with a METAL coating:

  • reflected power is .4399W
  • transmitted power is : .3607W

those values are coherent with the Reflection/Transmission curves, but I am wondering how those values are computed ? Because the METAL coating corresponds to a single layer of ALUM2 with index 0.82-5.99i and relative thickness 0.0075092

Is there a thin film equation that is used, in this case with incident media Air, coating METAL, and substrat also Air ? (since the MATERIAL of the rectangular volume is left empty)


Reply


Cookie policy

We use cookies to enhance and personalize your experience. If you accept you agree to our full cookie policy. Learn more about our cookies.

 
Cookie settings