I would like to model a continuously variable (Nnutral Density) ND filter. The attenuation function could be linear, Gaussian or sinusoidal. Is there any idea how to make such optical model?
Thanks!
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How to model a variable ND filter
Best answer by Sandrine Auriol
Hi Khaled
There are several options:
- The slide surface or object is a transparent object and uses an image to filter light so that could be used both in sequential and non-sequential mode.
- You could use a coating to define the filter.
Normally, OpticStudio assumes the coating thickness is uniform across the entire optical surface. But there is an option to create a tapered coating. Have a look at the polynomial options under The Libraries Tab > Coatings Group > Defining Coatings > The TAPR Data Section
You can find an example in the default coating file:
- In sequential mode, you can define a user-defined surface and there are examples of surfaces that modifies the transmission. Have a look at the surfaces called us_filt*.dll.
- In non-sequential, it could also be done via dlls.
Let us know if you need further help on any of these options.
Hi Khaled
There are several options:
- The slide surface or object is a transparent object and uses an image to filter light so that could be used both in sequential and non-sequential mode.
- You could use a coating to define the filter.
Normally, OpticStudio assumes the coating thickness is uniform across the entire optical surface. But there is an option to create a tapered coating. Have a look at the polynomial options under The Libraries Tab > Coatings Group > Defining Coatings > The TAPR Data SectionYou can find an example in the default coating file:
- In sequential mode, you can define a user-defined surface and there are examples of surfaces that modifies the transmission. Have a look at the surfaces called us_filt*.dll.
- In non-sequential, it could also be done via dlls.
Let us know if you need further help on any of these options.
Sandrine Auriol
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