NFRC Procedures for Applied Films

[Aishanura Handina Primanti]

Hi, I want to calculate optical data of a window film based on this article https://windows.lbl.gov/tools/knowledge-base/articles/nfrc-procedures-applied-films. However, I am a little bit confused how to input them in optics to get the film only data like this picture below.

Is this 

A-->

Layer 1 = substrate+film

Layer 2 = substrate

or

B-->

Layer 1 = film+substrate

Layer 2 = substrate

So the final result of my film specification can be seen in the system right?

 

[Jacob C. Jonsson (LBNL)]

Dear Aishanura,

The visualization in the documentation is for applied film manufacturers that want their data in the IGDB.
The System you circled in the Optics screenshot is the properties of a double glazing with your substrate+film as layer 1 and just a substrate as layer 2.

Optics will not expose the internal film properties on their own as they only makes sense when the film is applied to a substrate, so when you write you want to calculate the properties of the window film what is it that you want to get out of it?

Best,

Jacob

[Aishanura Handina Primanti]

Hi Jacob,

What do you mean exactly by "applied film manufacturers that want their data in the IGDB."?

On the diagram on my previous post, how can exactly on OPTICS to do this "back out" algorithm to only get the properties of the film?

Regards,

[Jacob C. Jonsson (LBNL)]

> What do you mean exactly by "applied film manufacturers that want their data in the IGDB."?

Companies like Eastman and Kuraray that manufacture applied window films want their film products in the international glazing database (IGDB). The database was designed for glass products, so even though these companies do not sell glass there has to be a way for them to get their film product into the database.

On the diagram on my previous post, how can exactly on OPTICS to do this "back out" algorithm to only get the properties of the film?

It is important to understand that it is the properties of the film when applied to a substrate that Optics is calculating, i.e. not the film freestanding in air. These "internal" properties are not the same as the external T, Rf, and Rb of whole layers and systems. To avoid confusion Optics does not expose them. The underlying methodology is described in the Window Optics paper by Rubin et al:

https://eta-publications.lbl.gov/sites/default/files/lbnl-39911.pdf

Best,

Jacob

[Aishanura Handina Primanti]

Hi Jacob,

Okay. I recently have done optical testing and I from the testing company have two IGDB data

1. substrate+film

2. substrate only

so if I have these two IGDB datas, how can I calculate the properties of my window film in OPTICS? so that I can get the optical properties when the film is applied to another type of glass?

Regards,

[Jacob C. Jonsson (LBNL)]

Looking at your Optics screenshot, if the user file you created

for FL4+Film layer had the substrate properly defined you can

right click on the #1 box (straight left from the System box you circled in your screen shot)

and select Change Substrate.  See example below with one of the applied films in the IGDB.