Anyone know of active DIY higher-er resolution spectrometer projects using image sensors? Is it possible to create a sharp image of 940-1240nm 3000 pixels across with less then $3000 in parts? I want to learn how to make a broader(uv to ir) but crappy-er version of this: <a href="https://solarsystem.nasa.gov/resources/390/the-solar-spectrum/" rel="nofollow">https://solarsystem.nasa.gov/resources/390/the-solar-spectru...</a>
almost completely off topic but btw the o in spectrometer, speedometer, worldometer, whatever is called an interfix. you've heard of suffixes and prefixes, well interfixes unlike those two have no meaning other than to join two root words (as in words that can't be used as suffixes or prefixes).
I've been wanting a cheap, no-cloud raman spectrometer in my pocket for a while now.<p>Like something that can plug into something as universal as an audio jack on a phone, reflecting the laser back into its built in camera. I know there was some options out there that were cloud-based but I want one simply lets us interpret the samples and their readings ourselves with lab device quality output.<p>DIY stuff like this is ultra cool but it's like miniaturize-able for sure, and something you can run with open source software.<p>I know it's around the corner, I've read about it. It's like the next killer feature for new cell phones already. [1] Making it open source so some corporations who are doing cloudy things with your spectrometer data is definitely an international research security imperative.<p>[1] <a href="https://aip.scitation.org/doi/10.1063/5.0046281" rel="nofollow">https://aip.scitation.org/doi/10.1063/5.0046281</a>
Really cool! I wonder if this could be combined with a digital micromirror and compressed sensing to inexpensively recover both spectral and spatial resolution. (see: "single pixel camera")
I guess it makes sense if you already have a DSLR, but you can get a proper used spectrometer for about $1k which is surely cheaper and better than a DSLR.
How does this compare to Les' RPI photospectrometer?<p><a href="https://www.hackster.io/news/les-wright-s-diy-raspberry-pi-spectrometer-064422bae529" rel="nofollow">https://www.hackster.io/news/les-wright-s-diy-raspberry-pi-s...</a><p>Does it just have a much larger spectrum?
A lower resolution but easier-to-construct variant: <a href="http://scheeline.scs.illinois.edu/~asweb/CPS/" rel="nofollow">http://scheeline.scs.illinois.edu/~asweb/CPS/</a>
Interesting. I garden and have thought it would be cool to build a spectrometer that I could feed soil samples and get NPK and other nutrient levels quickly without chemical processes.
The pdf mentions using a cfl to calibrate the position -> wavelength mapping, but wouldn't the peaks depend on the particular phosphors used for that lamp?