CIBJO releases Gemmological Special Report: considers process of separating measurable facts from opinion; See Gemological Articles below.
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 Post subject: Mobile spectrometry
PostPosted: Tue Aug 28, 2012 8:02 am 
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This guy has a Kickstarter project that involves some spectrometry software that you can use on your smartphone. I don't know if any of his project could be adapted for gemology, but just in case anyone is interested:

http://www.kickstarter.com/projects/jyw ... t?ref=card
http://publiclaboratory.org/tool/spectrometer


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 Post subject: Re: Mobile spectrometry
PostPosted: Wed Aug 29, 2012 2:26 pm 
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This is quite remeniscent of this thread

viewtopic.php?f=11&t=2116&hilit=ccd

However from what I could see the design of this spectrometer using a DVD as the grating does not appear to give enough resolution for gemological use. The horizontal resolution of an HD camera should be just under 2K pixels which is certainly getting there. Since there are also several hundred pixels worth of vertical resolution available it seems multiple gratings would be in order.

DVD and CD gratings spectroscopes have been built using cereal boxes and the advantage of these is by not trying to be miniature they become easier to build and could have much better resolution.

As they are offering these outfits they talk about 3-5nm resolution. More is better (ie smaller numbers)

Another problem with these methods may be the number of bits of A/D resolution which for example for cameras eight bits or 255 levels per channel. On the other hand , using the RGB filters could have the effect of doing some grating order sorting. If the deBayerization does not screw up the arithmetic.

Thank you for the link.
This will be interesting to watch.

I notice that in the spectrum of "blue sky" presented no real Fraunhofer lines are in evidence. (I wanna see Fraunhofer lines.! :lol: They are indicative of resolution.)


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 Post subject: Re: Mobile spectrometry
PostPosted: Thu Aug 30, 2012 8:29 am 
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Thanks for the lesson! Too bad that the phone app wouldn't be useful for gems.


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