Joined: Wed Mar 03, 2010 12:16 pm Posts: 68 Location: Maryland, USA
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:
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.! They are indicative of resolution.)
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