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CRAS
 Post subject: Laser
PostPosted: Fri Mar 13, 2009 8:02 pm 

Joined: Mon Aug 25, 2008 3:11 pm
Posts: 35
Location: Liechtenstein
Hi

I tried to simulate a laser LED with a point light source and a perfect parabolic reflector. I even thought about to add a reflector to cover the direct emitted light.

What maxwell gives back is similar to a spot with a opening angle of approx. 3-4°

Has anyone experience with this?

Thanks[/img][/b]
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polynurb
 Post subject:
PostPosted: Fri Mar 13, 2009 8:11 pm 
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Joined: Fri Mar 30, 2007 12:22 am
Posts: 1258
Location: Giedi Prime
Hi CRAS,

this is from an old thread, tried it some time ago.. seemed to work quite well.


Quote:
Hello all,

maybe that is also an approach:

I did some tests recently with Parabolic reflectors in rhino, locating a very small
emitter square in the focus of the revolved parabola.

after some tweaking of size ( the emitter was 0,002m in size) and meshing resolution of the parabola (the higher the better for accuracy) I was able to cast rays almost parallel over the distance of 1km.
the parabola itself was 5m in diameter. same as the "red spot" which was hit.
You can still see that the emitter was square.
I used a very low power skydome to show the grid in the render, so there is no scattering of the emitter.
I think that system should be "scalable" with changing the emitter power at the same time; haven`t tested more yet.. like noise clearing etc.
Image

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CRAS
 Post subject:
PostPosted: Wed Mar 25, 2009 9:05 pm 

Joined: Mon Aug 25, 2008 3:11 pm
Posts: 35
Location: Liechtenstein
Hi polynurb,

It´s the meshing of the parabolic reflector - now it´s clear!
My beam is 3mm in diameter and the light source @ 0,0015mm.
The mesh was far to coarse...

Can you tell me how I can change the parameter responsible for controlling the mesh generation process (SolidWorks) ?

Again thanks
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polynurb
 Post subject:
PostPosted: Thu Mar 26, 2009 1:23 am 
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Joined: Fri Mar 30, 2007 12:22 am
Posts: 1258
Location: Giedi Prime
..sorry don't know about SW.. but you'll for sure find the answer in the SW section of the forum :wink:

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workstation: EVGA SR-2 / dual x5650@3.5Ghz / quadro 4000


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jfrancis
 Post subject:
PostPosted: Fri Apr 03, 2009 10:53 am 

Joined: Tue Aug 30, 2005 3:19 am
Posts: 841
Image

Image

Other tests here...
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jfrancis
 Post subject:
PostPosted: Sun Apr 05, 2009 1:20 am 

Joined: Tue Aug 30, 2005 3:19 am
Posts: 841
I use one of Maya's regular 'Platonic solids' for the emitter to keep the polygon density and size about the same in all directions.
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Cadhorn
 Post subject:
PostPosted: Mon Apr 06, 2009 4:29 am 

Joined: Thu May 05, 2005 2:40 am
Posts: 151
Location: Los Angeles
Thanks for the parabola info/tests jfrancis. Very very useful!!

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jfrancis
 Post subject:
PostPosted: Mon Apr 06, 2009 4:49 am 

Joined: Tue Aug 30, 2005 3:19 am
Posts: 841
Thank you. :D

It's amazing to me that the ellipsoid and parabola, that look pretty similar at first glance, behave so differently.
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jfrancis
 Post subject:
PostPosted: Mon Apr 13, 2009 9:13 am 

Joined: Tue Aug 30, 2005 3:19 am
Posts: 841
Image

Image

True Fresnel lens

http://www.digitalartform.com/archives/ ... ens_-.html
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jfrancis
 Post subject:
PostPosted: Mon Apr 13, 2009 9:14 am 

Joined: Tue Aug 30, 2005 3:19 am
Posts: 841
Image

Image

Plano-convex (spherical) lens

http://www.digitalartform.com/archives/ ... ns_pl.html
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