" wrote in
:

On Jan 14, 5:21*pm, "William Sommerwerck"
wrote:
It's not a silly question.

Regular glass supposedly reflects infrared, does it not? And these
device
s
measure infrared, is not so?

Actually, glass reflects or absorbs infra-red based on angle and
composition and coatings (if any). Were it to reflect (all of) it, a
lens would not be very good at starting fires in by concentrating
sunlight.

Further, these guns use a laser and some sort of sensing device - so,
I am trying to determine how good it would be at sensing say... a wall
temperature a few feet inside a building through a window.

Peter Wieck
Melrose Park, PA

I would guess that the reading will be an AVERAGE of the actual wall
temperature and the glass temperature with weighing of those temperature
depending on the exact characteristics of the glass.

The only way to 'know' if it will work for YOUR application would be to
try it in enough cases. Measure the wall temperature directly (without the
glass in the path and then through the glass.

If you need to read the temp through the SAME glass, time after time, you
should be able to develop a calibration curve that will allow you to
accurately estimate the wall temperature.













--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

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