Eric Brombaugh wrote: > Dave McGuire wrote: >> I'd be shocked and amazed if they could detect thermal IR. > > Agree - there's a big difference between the short-wave IR that's used > by common IR remote controls (which is easily seen on most any webcam) > and the long-wave IR used in thermal imaging.
Ohh... we can control the situation to get near enough IR. We're looking for shorts anyway, not normal operating temps of + 1 degree... Seeing just the really hot spots -- meaning 120 deg F is plenty good, and the amount of near IR in that temperature surface is enough to see with a CCD I bet. Thermally emitted IR is a continuous curve or frequencies for a given temperature. Low temps just emit less near IR, but always some. So, I still bet CCD cameras could be very useful even without long IR sensitivity for a short detector, including shorted outputs and shorted traces. One way to test shorted traces without just burning through them would be to power with a current source to generate heat, then look with hacked CCD camera. One source of IR clear/ visibly opaque material is old corning Ceran glass stove tops. They are very dark to visible light. There is a kind of plastic sheet -visible/+nearIR filter also, but it's not a garden variety so likely expensive. John Griessen -- Ecosensory Austin TX _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
