RE: [plots-spectrometry] Re: Xenon Puck light reflector spray painted flat black

[barkergk]

Cool! I was afraid the paint would start smoking, but didn't happen.

Sent from my Verizon Wireless 4G LTE Smartphone

-------- Original message --------
From: Stoft <gwebw...@gmail.com>
Date: 05/19/2013 7:39 PM (GMT-07:00)
To: plots-spe...@googlegroups.com
Subject: [plots-spectrometry] Re: Xenon Puck light reflector spray painted flat black


Yes, extraneous light adds lots of noise. However, since I'm not a great fan of spray paint as my reflector gets hot ...... I use a really simple method that's good for most sources. I add a "slit" in front of the source. No, not a narrow slit like the spectrometer has, but about a 1/4-in slit. This emulates the light source being closer to a "point source" which is what is wanted anyway as the spectrometer's slit is is the only thing providing pseudo-columated light.

Dave


On Sunday, May 19, 2013 5:25:42 PM UTC-7, barkergk wrote:

I have been experimenting on how to clean up some of he extraneous light in a spectrum.

I found that removing the bulb from a G8 120V puck light and spray painting the reflector black produces a cleaner spectrum.

Anybody else try this before?

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[Mathew Lippincott]

An alternative to black paint is buying a roll of matte black aluminum foil, which is used in commercial photography for this purpose:

http://www.bhphotovideo.com/c/product/688227-REG/LEE_Filters_280R_Black_Aluminum_Foil.html

Barbecue paint or other enamel spray paint designed for high heat would work safely as well. As Dave says, its really nasty stuff, it all has xylene and other horrible solvents in it, but it will create a safe coat for lighting products. 

[Gary Barker]

Good point. I  guess I just got lucky with ordinary spray paint.
GB