This is a great project but its clearly a starting point for greater things.

I think its a great pity that you didnt explain a bit about the limitations and strengths of this type of spectroscopy, or privide pointers to additional material. For example, how far can you go with adding more LED’s covering other wavelengths. Presumably colourless liquids can never be analysed by this technique? Or did I get that wrong, perhaps they are not colourless to UV/IR. What other uses can we use something like this for? So it can detect a sample of Olive oil, well so can I! Can it tell the difference between Olive oil and rapeseed oil say? Can it detect adulterated foodstuffs? Pesticides? Can it measure.

I think a final paragraph saying how pleased you were (or not !)with what it can do in spite of the limitatations would be useful.

I’ve googled for this type of material and although I found 2 or three similar spectrometers of similar complexity very few people discus how far this could go.

So far as safety in airports is concerned surely many dangerous substances are near colourless any way and so beyond analysis by spectrometer?

Thank you so much for setting me thinking about this.
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