Here's what I'm thinking. The sun is too bright to measure directly with our equipment. If I calibrate without a filter, and capture the reference spectrum with and without the filter, then I can model how the filter changes the spectrum. This way I can capture the sun spectrum with the filter, and transform the data as if I had not used it.(adsbygoogle = window.adsbygoogle || []).push({});

What I mean to say is, if

[itex]I_{r}(\lambda)=Y(\lambda)[/itex]

and

[itex]I_{r+f}(\lambda)=G(\lambda)Y(\lambda)[/itex]

then is it valid to argue that

[itex]I_{s}(\lambda)=\frac{I_{s+f}(\lambda)}{G(\lambda)}[/itex]

Or is it that [itex]G(\lambda)[/itex] is dependent on I?

where

[itex]I_{r}[/itex] is the irradiance of the reference

[itex]I_{r+f}[/itex] is the irradiance of the reference measured through a filter

[itex]I_{s}[/itex] is the irradiance of the sample

[itex]I_{s+f}[/itex] is the irradiance of the sample measured through the same filter

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# Irradiance measurement procedure

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