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leswright1977 / PySpectrometer

Raspberry Pi Spectrometer
Apache License 2.0
662 stars 105 forks source link

UV. / IR #7

Open mrpackethead opened 3 years ago

mrpackethead commented 3 years ago

Hi. how far into the UV and IR does the raspberry PI camera go? If any?

MakerMatrix commented 3 years ago

I think the ones without the IR filter (NOIR) go up to about 880. Not sure about UV but doubtful would be much below 400 unless you had done something special (fitted a UV transmitting lens, for example).

mrpackethead commented 3 years ago

I'd been messing around with something similar but using a simple defaction grating slide, rather than the instrument. That was causing me endless fustration!

I'm hoping to use it for pretesting of honey to screen it before you send it to certified labs which is a really expensive exercise!

leswright1977 commented 3 years ago

Depends on the Camera. The NoIR version will go quite a ways into the IR, at least to 940nm (tested), and > 1000nm in theory. UV is sharp cut at 400nm due to optics and the CCD itself. That said there is a way, but it is challenging, and involves getting down to the silicon with petty harsh chemicals. I am however currently investigating the possibility!

Do you have any data from what constitutes 'good' and 'bad' honey?

mrpackethead commented 3 years ago

i've got a good 4k USB camera that i might have a good with, rather than use the rasbeery PI one. I was able to order it without the IR filter as an option.. 4k means theres more lines, so hopefully more accurate too.

evanheckert commented 2 years ago

@leswright1977 Is there additional hardware that would need to be changed to take advantage of a NoIR sensor, or is it otherwise plug and play?