[HN Gopher] DIY Raspberry Pi Spectrometer Guide
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       DIY Raspberry Pi Spectrometer Guide
        
       Author : robertelder
       Score  : 124 points
       Date   : 2022-01-21 18:26 UTC (4 hours ago)
        
 (HTM) web link (github.com)
 (TXT) w3m dump (github.com)
        
       | anfractuosity wrote:
       | Does anyone know what you call the mount with a screw that's
       | holding the spectrometer for either the mini/larger version? I
       | couldn't seem to see it mentioned in the readme.
       | 
       | I tried something similar using just blu tack to hold the
       | spectrometer to camera, from looking at the graph from it I think
       | I possibly used the pi noir camera, as it can seem to see up to
       | 900+nm or so.
        
         | dljsjr wrote:
         | I worked in a laser lab w/ an optical table in college and I
         | believe it's called a beam probe mount. If you're referring to
         | the black powder coated aluminum block w/ the through-hole and
         | the tightening screw.
        
       | KennyBlanken wrote:
       | You can use a peeled-apart DVD and a USB web camera for a
       | fraction of the cost. It's a design Public Labs came up with
       | around 2012: https://hackaday.com/2012/08/27/turning-a-webcam-
       | into-a-spec...
       | 
       | Public Labs even developed a modified design that works with most
       | smart phone cameras, among their follow-up work (such as testing
       | high-end cameras:
       | https://publiclab.org/notes/stoft/10-23-2016/high-rez-webcam... )
       | 
       | The spectral response of the sensor is not linear, as it is
       | designed to imitate human vision - and as anyone who read early
       | 2000's digital camera reviews can tell you, even fancy cameras
       | from well known manufacturers can have noticeably different color
       | response.
       | 
       | One benefit of Rasp Pi cameras is that genuine cameras could be
       | evaluated and characterized, but counterfeits and such will be a
       | problem. Same is true of USB web cams, I suppose.
        
       | mncharity wrote:
       | OT question: Is it possible to use a wedge-shaped slit (uneven
       | width) to increase the dynamic range of a slit-grating-camera
       | phone spectrograph?
       | 
       | Backstory: I've repeatedly encountered deep confusion about
       | color, even among first-tier physical-sciences graduate students.
       | Yet color is widely taught K-2. Apparently without great success.
       | So what might a rewrite, a modern learning progression for color,
       | look like? Perhaps one based on spectra, a modern colorspace, and
       | building on current understanding of color perception? Tablets
       | are used in K - "find and take a picture of a circle". So how
       | about using them for color? There's middle-school work with color
       | "arithmetic" (an <R, G, B> binary triple with addition(light) and
       | subtraction(filter)). And phone spectrographs are a thing.
       | Thermal IR inspection cameras suggest having a context image aids
       | understandability, and phones now have multiple cameras, so might
       | one do a more accessible sample-with-context spectroscope app?
       | With the light path folded flat, not sticking out? And a high
       | dynamic range to permit sampling objects under ambient
       | illumination? Might one craft a spectra-based introduction to
       | color? For K?
        
       | [deleted]
        
       | showerst wrote:
       | If you're into lasers, Les' YouTube channel is a goldmine.
        
       | andai wrote:
       | What would happen to the quality if the diffraction grating
       | spectroscope were replaced with a prism?
        
         | analog31 wrote:
         | That can work too. You have to work out the range of angles
         | that a given prism produces, not an unsolvable math problem.
        
       | csdvrx wrote:
       | Unfortunately, light spectrometer, not mass spectrometer.
       | 
       | I'd love a DIY mass spectrometer or liquid chromatograph for
       | biohacking!
        
         | anfractuosity wrote:
         | You might like - https://www.youtube.com/watch?v=nIKhUizkXxA (
         | DIY mass spectrometer measures potassium in dietary salt
         | substitute ) by Ben Krasnow
        
           | nbernard wrote:
           | As well as Chromatogiraffery's channel:
           | https://www.youtube.com/channel/UCZ8l6SdZuRuoSdze1dIpzAQ
        
         | shpongled wrote:
         | I think you're going to have a very hard time doing any kind of
         | actual (interesting) analysis on a DIY MS.
        
         | cinntaile wrote:
         | https://www.open-raman.org/
         | 
         | You can try building that one. It's a DIY raman spectrometer.
        
       | genericone wrote:
       | Just in time to make a DIY plant-sap-analysis tool, perfect
       | timing!
       | 
       | Related: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4371691/
        
       | forgotmyoldacc wrote:
       | $70 seems expensive for a diffraction grating, what am I missing?
        
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       (page generated 2022-01-21 23:00 UTC)