Re: spyproofing your house/work building

<<Except that they would go off whenever the sun was up, or whenever a car
with its headlights on drives up.>>

So is there a way to detect the specific IR that the bad guys use?

On Fri, 18 Mar 1994, Arsen Ray Arachelian wrote:

> <<Except that they would go off whenever the sun was up, or whenever a car
> with its headlights on drives up.>>
> 
> So is there a way to detect the specific IR that the bad guys use?

Probably.  I am just pointing out that the *cheap* IR sensors that Rat 
Shack sells are activated by anything - not just IR light.  There is 
probably a better model sold by some electronics company.

--
Jim Lawson				Computing & Information Technology
jlawson@mole.uvm.edu				     University of Vermont
Finger for PGP KeyID: FD0339

Excerpts from internet.cypherpunks: 18-Mar-94 Re: spyproofing your
house/.. by Arsen Ray Arachelian@pri 
> <<Except that they would go off whenever the sun was up, or whenever a car
> with its headlights on drives up.>>
>  
> So is there a way to detect the specific IR that the bad guys use?

Measure the ratio of IR to visible light.