Re: [DIYbio] Re: Open-Source Spectrometer

It depends on what you're interested in doing with it... I haven't
bought one as its got too many caveats that lower quality and
usability (for example it is a video camera so is limited to 30 FPS,
if your computer can keep up that fast... while I wanted to do up to
60 FPS to your computer direct to an SD card... the bayer filter
reduces signal then adds noise when you convert from color to black
and white... it is a CMOS device, so you can watch a live video and
literally see significant digital noise in dark/black frames (the
raspberry pi camera is pretty bad as far as digital noise goes too)).
There are also driver problems, I believe the auto-exposure is always
on, so you can't do HDR type stuff without a physical neutral-density
filter... or be sure your current measurement was taken with the same
settings as your last measurement. The grating is also a piece of DVD,
which means it isn't optimal for spreading the spectrum out (the lines
are curved not straight as in a normal grating), and I believe its
used as a transmission mode grating, and being plastic it is going to
limit UV throughput significantly (so even if the sensor could be made
sensitive to UV, that would block it quite a bit).

That said, if you're new to all the science and technology, you
probably didn't spend too much to get started so it is probably OK.
There's a lot to learn, you've gotta start somewhere!

On Wed, Jun 4, 2014 at 3:30 PM, Jebus Jones <raid517@hotmail.com> wrote:
> I bought this: http://store.publiclab.org/ Did I do the right thing?
>
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--
-Nathan

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