Please help me see the light
April 12, 2012 1:30 PM Subscribe
Please help me find a component photocell (photoconductor) that works well in the IR range. I'm trying to find a photocell that works in the micrometer wavelength range. The market is full of Cadmium Sulfide (CdS), but those peak at a little less than 1 micrometer wavelengths.
posted by nickerbocker to Science & Nature (9 answers total) 1 user marked this as a favorite
I dusted off the cover of my old optics book and within it I see that there are several types of photoconductors that go into the 10's of micrometers but I am having a hard time finding them for purchase on the Internet. Lots of papers come up, but no retail outlets. It looks like a Germanium based photoconductor may be the best bet, (Ge:Hg, Ge:Cu; or Ge:In).
What I'm trying to do is detect ignition of a really small test sample within a dark chamber. Some samples the CdS photocell I've been using works fine. Other test samples don't seem to emit much visible light, and I suspect that they emit more light in the IR than in the visible.
I'm looking for just the component. (I.e., a photocell with throughhole leads).
As always, Thanks for your input :).