What's the badwidth you're interested in? Shooting from the hip, I'd recommend a photodiode http://media.digikey.com/pdf/Data%20Sheets/Opto%20Diode/ODD-470W.pdf if you just need a coarse signal that detects the band centered on 470nm. Also, you could use an analog to digital converter or even just a properly dialed-in comparator to cut out the heads and tails of the spectrum.

on Nov 12, 2013, StCredZero <stcredzero@gmail.com> wrote:

On Tue, Nov 12, 2013 at 10:05 AM, Steve Berl <steveberl@gmail.com> wrote:

Another thought. How about one of those monitor calibration devices like the Datacolor Spider. I've got one you could borrow. Here's an article about how to use it with Linux. http://www.gdargaud.net/Hack/LinuxSpyder.html

They use software called dispcal http://dispcalgui.hoech.net/

I'd guess that if you dig into the source for that you can find code to control and read color data from the Spyder.

Nifty thought, but the kind of measurement we need can't be done with RGB light producing devices or RGB light sensing devices. In fact, the knee-jerk-didnt-think-it-through criticism that will be raised will use the inherent limitations of RGB devices to try and discredit this instrument. This is why true monochromatic sources, diffraction gratings, and non-synthetic true pan-chromatic sensors are needed.

(It will work, because we are exploiting bandpass filters built into the camera, so the criticisms aren't valid. But true monochromatic sources and pan-chromatic sensors will be needed to validate and measure the true response.)

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