From:	Adam Getchell <acgetche@****.UCDAVIS.EDU>
Subject:	Thermographics and Improved Invisibility
Date:	Mon, 24 Oct 1994 11:45:54 -0700

On Mon, 24 Oct 1994, Micah Levy wrote:

Improved Invisibility (Physical) works by bending light around you.
Vision is a passive sense, not an active one. This means that
light shines on the object, and then is randomly scattered into the
environment where it is picked up by detectors (eyes).
If light bends around the object, then no light reflects from the
objet and there is no light to detect the object with. Hence, it becomes
invisible. But now, the object actively radiates heat into the
environment, and bent or not the heat is still going to escape into the
environment, where it can be detected.
Ultrasound is an active sensor, meaning it sends out pulses of
sound which bounce off objects and reflect back into the environment,
where it can be detected. Because Invisibility does not affect Sound, it
cannot hide from Ultrasound. Because Invisibility does not change the
heat signature of the recipient, it cannot prevent the target from
emitting heat, and thus becoming detectable via Thermographic vision.

> ||Micah Levy Department of Computer Science ||

+-------------+---------------------------------------------------------------+
|Adam Getchell|acgetche@****.engr.ucdavis.edu | ez000270@*******.ucdavis.edu |
| acgetchell |"Invincibility is in oneself, vulnerability is in the opponent"|
+-------------+---------------------------------------------------------------+