Help With Acetone Spectrum Reading

[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 (4.04 MiB) Viewed 28 times

Note, this is the spectrum I got:

IMG20241106163459.jpg (9.93 MiB) Viewed 28 times

This is what I saw through the camera:

IMG20241106163511.jpg (8.93 MiB) Viewed 28 times

[BowenZheng]

This is what I saw when finished calibrating the neon light

IMG20241106155107.jpg (8.46 MiB) Viewed 27 times

[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?

[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

[Luc]

Getting the signal can be difficult the first time. Can you try repeating the alignment process using the two frosted disks w/ pinholes?