[HN Gopher] DIY Raspberry Pi Spectrometer Guide ___________________________________________________________________ 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? ___________________________________________________________________ (page generated 2022-01-21 23:00 UTC)