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Article #101Re: nasa-celebrates-successful-mars-landing
From: David Eather
Date: Mon, 13 Aug 2012 09:32
Date: Mon, 13 Aug 2012 09:32
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4222 bytes
On Mon, 13 Aug 2012 18:31:17 +1000, Jon Kirwan <jonk@infinitefactors.org> wrote: > On Mon, 13 Aug 2012 01:18:31 -0700, I wrote: > >> On Sun, 12 Aug 2012 23:52:09 -0700, Jeff Liebermann >> <jeffl@cruzio.com> wrote: >> >>> On Sat, 11 Aug 2012 23:22:35 -0700, Jon Kirwan >>> <jonk@infinitefactors.org> wrote: >>> >>>> My intent is to only use parts that a student can afford to >>>> buy and OWN at home. >>> >>> Is $30 too much? >>> <http://shop.breadpig.com/collections/publiclaboratory/products/desktop-spectrometry-kit> >>> <http://spectralworkbench.org> >> >> Yes, $30 is too much and so is requiring a computer. To start >> out, the students build a paper box and use a DVD and just >> their eyes. The DVD is far far less than $1. (20 cents?) The >> box is ONE sheet of cardstock (a few pennies.) The glue is >> Elmer's and doesn't need much. That's it. The DVD is the only >> tricky part. I just prefer the DVD-RW because it doesn't have >> a terrible blind spot in the red band (DVD-R absorbs heavily >> over a range in there.) >> >> Some students will then move on to the idea of a camera and >> using a computer to process the pixels. There is some work >> involved in that next step (I've already written all the >> wavelength calibration software, though.) Not all students go >> there. Most just stop at the box and use their eyes. > > P.S. I also see that the above $30 unit specs "better than > 3nm spectral resolution." I'm already getting much better > than that, being able to easily separate 577nm and 579nm > mercury doublet. Easily. > > Jon http://www.ebay.com/itm/Holographic-Diffraction-Grating-Glasses-Double-Axis-13-500-l-Specrum-Laser-NEW-/280806590885?pt=LH_DefaultDomain_0&hash=item41616089a5 -- Using Opera's revolutionary email client: http://www.opera.com/mail/
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Newsgroups: sci.electronics.design,aus.electronics,comp.arch.embedded
Subject: Re: nasa-celebrates-successful-mars-landing
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Date: Mon, 13 Aug 2012 19:32:19 +1000
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From: "David Eather" <eather@tpg.com.au>
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