From:	Mongoose <m0ng005e@*********.COM>
Subject:	Re: thermographic vision-question
Date:	Tue, 2 Feb 1999 14:23:47 -0600

O.K. Surely you guys/and gals on this list, can help me. I have this
player in the group who sees thermographic vision as the ultimate
solution to perception tests. He states that with thermographic
vision you can see nearly (through) everything. I think he's
mistaking it for IR-vision, but I can't get that in his head.

Could someone please post a mail explaining what thermographic vision
is, and how it works. Preferably long, with lot's of difficult words
in it (his English isn't that good:)).


+++++++++++++++++

Simple question that might clear things up,in small words- if
thermovison (which IS vision of IR radiation) lets you see through walls,
why do people build houses to keep warm?
IR radiation does not pass though solid objects, as demonstrated when
using, say, a common TV remote control, which emits pulses of IR "light",
which the controlled device has a sensor for. I does mostly pass through
smoke, cloth, and other (occasionally light opaque) thin materials. Also,
it is partially blocked by some materials that do not block light- like
common window glass.

Mongoose