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Hi Paul (and Roger)
Roger is right – method 2 is the right way to create your data collection. SCiO’s algorithmic engine requires DIFFERENT samples to have a successful model. Scanning all notes under the same sample id will result in a poor model. To write it differently – 100 scans of a single sample is not the same as 10 scans of 10 samples.
Using PTFE as a reflective surface is a good idea – it does not have prominent feature in NIR and is supposed to be very reflective.
I would also scan notes of a different denomination to see if there’s a difference between them, and obviously, if you have access to counterfeited notes, it will be very good to scan them as well.
Keep us posted