[aprssig] FW: X-Ray vision for the APRS DIY'er

jleekley at execpc.com jleekley at execpc.com
Tue Apr 26 17:33:30 EDT 2016

So, next time, use the cat instead of the space 

John, WB9SMM

On 26 Apr 2016 at 11:01, Robert Bruninga via 
aprssig wrote:

Date sent:	Tue, 26 Apr 2016 11:01:29 -0400
To:	aprssig at tapr.org
Subject:	[aprssig] FW: X-Ray vision for the APRS DIY'er
From:	Robert Bruninga via aprssig <aprssig at tapr.org>
Send reply to:	Robert Bruninga <bruninga at usna.edu>,
	TAPR APRS Mailing List <aprssig at tapr.org>

>     For your APRS power distribution system in your walls...
>     I needed to see through a wall to see the studs in a 100 year old
>     plaster and lath wall.  It was easy.   Just put a radiant space
>     heater on the other side to heat the wall.  Then after an hour or
>     so, use an IR camera to view the wall.  You can see the studs and
>     anything else that is inconsistent inside the wall.   Then I
>     happened to glance with the IR camera at the wall where I had the
>     1500 W electric heater plugged in, and I could CLEARLY see the hot
>     wiring in 3D.  By moving the camera around I could see the hot
>     wire in 3D  and not only see where it was, but how deep or, along
>     which wall in the pocket it was located.   I then went on an
>     exploration mission in my basement to see hotspots in my entire
>     electrical system.  It was an amazing color display liken to
>     XMAS.   Then I noticed a large, unusually bright spot from the
>     basement looking up at the kitchen floor.  I was concerned, since
>     it should have been a part of open floor and there should not be
>     any heat source there unless it was an electrical problem beneath
>     the floor.  I ran upstairs only to find a cat, sleeping on a
>     thick rug, on a ceramic tile, on a ¾" underlayment, on top of
>     an OAK floor, on top of ¾" tongue and groove subfloor. That´s
>     seeing a cat through 3" of solid wood, ceramic and a rug.  Just
>     laying there burning up cat food.   I think these cameras are
>     under $500 and even have APPS on cell phones that can do it?  
>     You wont be able to see though metal, but through anything else,
>     maybe so.  In fact, to perfectly mark the hazy images where I
>     wanted to drill the hole to the stud, I used a small 1" square
>     of aluminum foil.  It has low emissivity and always appears DARK
>     against anything else that is warm behind it.  But also, be
>     aware, that the aluminum foil is not only low-E, but it is also IR
>     REFLECTIVE.  So it can look very hot (98.6F) if you happen to be
>     standing where the aluminum can reflect your body heat.   Bob,
>     WB4APR

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