I got a tiny ruby stone and shone a tungsten halogen light behind it - https://www.anfractuosity.com/files/ruby.png I could see a dip around 694nm like someone else's spectrum - https://en.wikipedia.org/wiki/Ruby_laser#/media/File:Ruby_tr.... This is the same wavelength that ruby lasers emit light apparently.
I'm planning on using it to try to measure ABV of beer/spirits. I noticed some of the cuvette holders with fibre inputs seem to be crazy expensive though, so probably need to DIY that!
A while ago I got a little spectroscope that looked a bit like - https://shop.wf-education.com/science/op66595.html. And simply attached to a camera, to generate graph from.
It should move from ~1.15eV at room temp 75F/25C to ~1.10eV at 120F/50C, which should be about 35nm longer.
I'm just wondering how fancy vs. DIY you need for that sort of purpose basically.
I'm not sure what the peaks correspond to regarding the ethanol molecule though afraid. It's been a while since I read the paper, but maybe that indicates this.
I believe my spectrometer just has a linear CCD sensor.
A few years ago we had several cans replaced with solid state LED fixtures and my wife has had a lot of trouble with sleep which roughly correlates. It may be placebo, but it seems like she also may get better sleep when watching an OLED TV vs an LCD iPad. It made me wonder if we should put 460nm filters on our ceiling lights.
> Didn't DIY'ers know this technique for years?
I used to live in a rural area (fixing everything in the house by myself) so I'm quite the DIYer but I don't know anything about that!
First I've ever heard of it, and I went pretty deep into the rabbit hole of spectrum when I switched to LEDs in my home. Don't think this is very common knowledge.
P.S. Doxxing me is trivial based on what is already available in this forum
Cool article nonetheless..!
It's a fun thing to do in an afternoon.
0: https://publiclab.org/wiki/papercraft-spectrometerI would have never in a million years thought of this use for a plain old CD... but yes, after reading this article, yes, I now see how a CD Spectrometer could indeed work!
Again, absolutely and utterly brilliant!
Upvoted and favorited!
Constructing a spectrometer using a CD - https://news.ycombinator.com/item?id=10285117 - Sept 2015 (9 comments)