$5 color meter at DVinfo.net

Jim Michael · January 27th, 2015, 05:47 PM

Years ago I used a large spectroscope to photograph a hydrogen spectrum with the goal of resolving the hydrogen-deuterium line separation for a school physics project. Recently I picked up a smaller spectroscope useful for analyzing potential light sources. It's a little plastic device with a diffraction grating and a slit on one end. You sight through the device at your light source and look over to the side to see the spectral composition of your source. For instance a tungsten source shows a smooth spectrum from deep red to violet, a fluorescent tube shows red, blue, and green bands. An LED source shows the expected cutoff at the deep blue region. Although they claim it's a quantitative device I don't think it gives you much more than a qualitative comparison of sources. About $5. EISCO Premium Quantitative Spectroscope, +/- 5nm Accuracy: Science Lab Spectrometers: Amazon.com: Industrial & Scientific

Donald McPherson · January 28th, 2015, 12:15 PM

I remember one of those from the Open University science foundation course.

January 27th, 2015, 05:47 PM	#1
Jim Michael Major Player Join Date: Dec 2005 Posts: 895	$5 color meter Years ago I used a large spectroscope to photograph a hydrogen spectrum with the goal of resolving the hydrogen-deuterium line separation for a school physics project. Recently I picked up a smaller spectroscope useful for analyzing potential light sources. It's a little plastic device with a diffraction grating and a slit on one end. You sight through the device at your light source and look over to the side to see the spectral composition of your source. For instance a tungsten source shows a smooth spectrum from deep red to violet, a fluorescent tube shows red, blue, and green bands. An LED source shows the expected cutoff at the deep blue region. Although they claim it's a quantitative device I don't think it gives you much more than a qualitative comparison of sources. About $5. EISCO Premium Quantitative Spectroscope, +/- 5nm Accuracy: Science Lab Spectrometers: Amazon.com: Industrial & Scientific

January 28th, 2015, 12:15 PM	#2
Donald McPherson Major Player Join Date: Jun 2010 Location: Aberdeen Scotland Posts: 815	Re: $5 color meter I remember one of those from the Open University science foundation course.