On Dec 12, 7:12 am, nick hull wrote:
I use a 'game camera" as a security camera at the gate to my farm.
After having one stolen, I mounted the next in a locked steel box up on
a pole. Worked great until opening day of hunting season, when someone
shot the camera thru the (relatively) small hole left for the flash,
lens, IR detector etc. Now I see I need to make it reasonably bullet
proof, presumably 22lr bulletproof, from at least ONE direction.

A 1/2" piece of Lexan would stop the bullets, but would also probably
block the IR sensor that triggers the camera - a flimsy plastic freznel
lens. Lexan might also cause problems with the flash, especially if I
go to IR flash for stealth mode.

A mirror also seems to have possibilities, the camera could be 100%
bulletproof and the (cheap, replaceable) mirror would shatter. Again I
would expect problems with the IR trigger, can I get the IR trigger to
work with a mirror?

All ideas welcomed.

Free men own guns - www(dot)geocities(dot)com/CapitolHill/5357/
** Posted fromhttp://www.teranews.com**

The IR trigger will work with a front surface mirror. With a rear
surface mirror the normal glass will attenuate the IR to some extent.
It depends on the wavelength at which the trigger is operating. Near
IR (close to visible wavelengths around 1 um) you should be OK, at far
IR wavelengths (around 10 um) normal glass is very attenuative.

I have picked up front surface mirrors at surplus places for a couple
of dollars, Axman's in St. Paul Mn 1991. worth a look. Lacking that
most polished metals make a reasonable mirror for far IR. Can you use
a different mirror for the trigger and the picture?

CarlBoyd