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Plotting the intensity as a surface plot from a ray tracing computation

Posted Feb 9, 2018, 3:10 a.m. EST Ray Optics, Results & Visualization Version 5.3a 3 Replies

Phillip Springer
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Hi, I am new to Comsol Multiphysics and just started to use its ray tracing capabilities. I am sucessfull in propagating some rays over a specified distance which is all I do at the moment. For this purpose I have a working plane with a rectangle as my only element in the geometry. I have defined a surface under the data sets tab in results and now I want to plot the intensity distribution at the working plane as a contour plot. However, when I add a 2d plotting group with a surface plot and try to chose gop.I as the variable to plot, I get an error message:

Cannot evaluate expression. Undefined variable. - Variable: comp1.gop.I - Geometry: geom1 - Boundary: 1 Failed to evaluate expression. - Expression: comp1.gop.I - Plot: surf1 (Surface)

So what am I doing wrong and how can I achieve what I like, which is to plot the intensity of my rays at a specified plane as a contour plot? I attached a .mph file of my attempt.

3 Replies Last Post Mar 21, 2018, 11:09 p.m. EDT
Sergei Yushanov Certified Consultant
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Posted: 7 years ago Feb 9, 2018, 9:31 a.m. EST

Phillip,

Since your geometry is 3D, you should use 3D Plot Grpoup/Surface, as shown in the attached image.

Regards,

Sergei

Phillip, Since your geometry is 3D, you should use 3D Plot Grpoup/Surface, as shown in the attached image. Regards, Sergei

Attachments:

Nathan Hines
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Posted: 7 years ago Feb 26, 2018, 4:10 p.m. EST

I am also new to COMSOL and am having similar issues. I am trying to get a contour plot that shows the spatial density of rays incident upon a plane (surface #6 in the attached model). Here are a few of the details for the model:

I placed a ray detector on surface #6.

I placed a freeze condition on surface #6.

I set 100 rays to release from surface #1.

I created a surface under Results>>Data Sets. This surface references surface #6.

I created a 3D plot group and referenced Study1, which is the Geometrical Optics Study.

I created a contour plot under the 3D plot group that references the surface I created under data sets.

For the contour plot expression, I chose gop.rd1.Nsel. This is the total # of rays in the ray detector expression.

When I try to plot this, nothing appears.

Thanks in advance for the help.

I am also new to COMSOL and am having similar issues. I am trying to get a contour plot that shows the spatial density of rays incident upon a plane (surface #6 in the attached model). Here are a few of the details for the model: I placed a ray detector on surface #6. I placed a freeze condition on surface #6. I set 100 rays to release from surface #1. I created a surface under Results>>Data Sets. This surface references surface #6. I created a 3D plot group and referenced Study1, which is the Geometrical Optics Study. I created a contour plot under the 3D plot group that references the surface I created under data sets. For the contour plot expression, I chose gop.rd1.Nsel. This is the total # of rays in the ray detector expression. When I try to plot this, nothing appears. Thanks in advance for the help.

Attachments:

Yonggu Lee
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Posted: 7 years ago Mar 21, 2018, 11:09 p.m. EDT
Updated: 7 years ago Mar 21, 2018, 11:10 p.m. EDT

Thank you for your information

Actually, i am a beginner of comsol and i want to check the ray intensity after ray passing specific the wall.

Your attachment is upper version than mine so, i cannot refer it

I made 3D model to estimate the ray intensity however whenever i tried to integral all of ray's intensity (using integral), the erroe occured...

could you help me?

Thanks

Thank you for your information Actually, i am a beginner of comsol and i want to check the ray intensity after ray passing specific the wall. Your attachment is upper version than mine so, i cannot refer it I made 3D model to estimate the ray intensity however whenever i tried to integral all of ray's intensity (using integral), the erroe occured... could you help me? Thanks

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