Pete,
There is a thermal sensitive paint used for indicating over
temperature conditions of electronic power components, perhaps this will
help you focus the search. And speaking of focussing, I think a lens would
be needed to implement such an indicator.
Luke
Pete Swanstrom wrote:
> A new topic!
>
> Is anyone aware of a durable (and inexpensive?) thermal-indicating film,
> similar to that on side of Duracell batteries, which would be sensitive
> enough to infrared to be used on a sundial face to indicate the gnomon's
> shadow even on cloudy days?
>
> Pete.
