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Message from discussion SPECTROMETER THOUGHTS
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Jeffrey Warren  
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 More options May 1 2012, 12:02 pm
From: Jeffrey Warren <j...@publiclaboratory.org>
Date: Tue, 1 May 2012 12:02:54 -0400
Local: Tues, May 1 2012 12:02 pm
Subject: Re: [PLOTS] SPECTROMETER THOUGHTS
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All your suggestions would probably result in higher spectral resolution,
and are worth trying. Giuliano Moschini demonstrated that simply doing more
careful and rigid construction and narrowing the slot could result in
substantially higher resolution:

http://spectralworkbench.org/sets/show/6

My biggest interest right now is dynamic range, though -- for many samples,
the signal is so weak that there's not much data to look at, really. But
JoshMC has been having a lot of success reading up to 60% brightness for
his UV tests of everything from laundry detergent to Listerine:

http://spectralworkbench.org/spectra/show/236

I really NEED to spend some time refining and tidying up the software a
bit. But I really WANT to spend some time centrifuging sediment from the
Gowanus Canal and doing UV tests like JoshMC's been trying.

Jeff

On Tue, May 1, 2012 at 11:15 AM, Adam Griffith <adamdgriff...@gmail.com>wrote:

> That's good to hear, Mat.  Do you have any web links for what we are
> chasing in terms of the technology?  Alternatives, etc?

> (I've never cared too much about color, but that probably shows in my
> wardrobe.)

> On Tue, May 1, 2012 at 11:08 AM, Mathew Lippincott <
> mathew.lippinc...@gmail.com> wrote:

>> Adam, that's an awesome idea.  Color calibration is outrageously
>> expensive.  I've done it manually to save money, and I still needed and a
>> calibrated printed color chart($60), and did the work in sunlight.  That's
>> the cheapest option and its pricier than our spectrometer.

>> On Apr 30, 2012 7:54 PM, "Adam Griffith" <a...@publiclaboratory.org>
>> wrote:

>> On an airplane in Europe, I had a great conversation with Dr. G. Tempea,
>> a laser physicist, regarding spectral resolution.

>> Design ideas:
>> - could the resolution be increased by using a Blu-Ray DVD as the
>> diffraction grating?
>> - could the resolution be increased by using a camera with a larger
>> sensor? Higher megapixels?
>> - what are the CCD limitations?
>> - could the resolution be increased by increasing the distance between
>> the diffraction grating and the "screen?"

>> Application idea:
>> - color calibration for computer monitors. Right now, the software to do
>> color matching (for printing, among other things) is expensive and
>> proprietary.
>> Adam

>> --
>> Adam Griffith
>> Director of Science and Coastal Environments
>> publiclaboratory.org
>> 828.321.2326

>>  -- Post to this group at publiclaboratory@googlegroups.com. To
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>> Options at https://groups.google.com/d/forum/publiclaboratory?hl=en

> --
> Adam Griffith
> Director of Science and Coastal Environments
> publiclaboratory.org
> 828.321.2326

> -- Post to this group at publiclaboratory@googlegroups.com. To
> unsubscribe, email publiclaboratory+unsubscribe@googlegroups.com. Options
> at https://groups.google.com/d/forum/publiclaboratory?hl=en


 
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