Going to take a while to get through that!
On 1/15/2013 6:51 PM, RussellMc wrote:
>> Is there a simple or at least an inexpensive way to measure the spectrum
>> of a light source?
> Yes - and it's the same method used in some real and often expensive
> instruments/
> Use a diffraction grating to split the light into a spectrum and move
> a photo detector across the output (or use a moving mirror) or use a
> linear multi element detector.
>
> Diffraction gratings of acceptable performance for playing may be
> produced by using part of an unrecorded recordable CD.
> "Real" gratings can be had for prices from about nothing through forget-i=
t.
>
> Much on web under spectrometer and diffraction grating.
> Various DIY designs.
>
> _____________
>
> Yee Ha / Wow
>
> https://www.google.co.nz/search?q=3Dspectrometer+diy&hl=3Den&tbo=3Du&tbm=
=3Disch&source=3Duniv&sa=3DX&ei=3DDOn1UNWXKvCwiQeV7YGoDA&ved=3D0CFgQsAQ&biw=
=3D1536&bih=3D840
>
> ______________
>
> Digital camera, piece of CD, cardboard and tape.
> Impressive results considering.
> http://blizzard.rwic.und.edu/~nordlie/spec/
>
> ___________
>
> Kickstarter
> $35 kit
> That tells you how hard it isn't
> This analyses a sample that is filtering a light source BUT the
> extension (or subset) related to LEDs is obvious
>
> http://www.kickstarter.com/projects/jywarren/public-lab-diy-spectrometry-=
kit
>
> http://publiclaboratory.org/tool/spectrometer
>
> http://www.engadget.com/2012/08/28/insert-coin-public-lab-diy-spectromete=
r-wants-to-be-the-shazam/
>
> __________
>
> Open hardware
> Free software
> And/or buy now
> http://myspectral.com/
>
> ______
>
> Spectra glasses + webcam / cellphone cam
> http://www.wired.com/wiredscience/2012/07/diy-spectrometer/
>
>
>
>            Russell McMahon

--=20
John Ferrell W8CCW
That which can be destroyed by the truth should be.
P.C. HODGELL
  =20


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