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Help With Acetone Spectrum Reading

Posted: Thu Nov 07, 2024 3:06 am
by BowenZheng
Hi there,

I've been having some issues trying to get an acetone spectrum and would appreciate any feedback.

Firstly, I didn't have an achromatic doublet lens on hand and used a microscope objective 10x lens (https://www.edmundoptics.com/p/olympus- ... ive/29222/) instead, so I don't know if that's an issue.

I also used a different glass tube, so I redesigned the cuvette holder to what you see here:
IMG20241106163402.jpg
IMG20241106163402.jpg (4.04 MiB) Viewed 26 times
Note, this is the spectrum I got:
IMG20241106163459.jpg
IMG20241106163459.jpg (9.93 MiB) Viewed 26 times
This is what I saw through the camera:
IMG20241106163511.jpg
IMG20241106163511.jpg (8.93 MiB) Viewed 26 times

Re: Help With Acetone Spectrum Reading

Posted: Thu Nov 07, 2024 3:09 am
by BowenZheng
This is what I saw when finished calibrating the neon light
IMG20241106155107.jpg
IMG20241106155107.jpg (8.46 MiB) Viewed 25 times

Re: Help With Acetone Spectrum Reading

Posted: Thu Nov 07, 2024 5:54 am
by Luc
The calibration looks fishy :-/ I'd say the spectrum needs to be moved to the right.

Just to check, What camera and imaging lens are you using?

Re: Help With Acetone Spectrum Reading

Posted: Thu Nov 07, 2024 10:21 pm
by BowenZheng
Hi Luc,

I have a Navitar NMV-35M23 35 mm F/2.0 2/3" Megapixel imaging lens (https://www.mengelengineering.dk/lm35jc ... pixel.html), and a Blackfly S GigE camera.

Best,
Bowen

Re: Help With Acetone Spectrum Reading

Posted: Sat Nov 09, 2024 7:05 am
by Luc
Getting the signal can be difficult the first time. Can you try repeating the alignment process using the two frosted disks w/ pinholes?