The U.S. Border At Night, Part 6
IR Night Vision cameras
IR Night Vision cameras are simply daylight or low light level
cameras that have been fitted with some kind of light source that
the human eye does not see. These cameras can be used in the daytime
and at night (using their built in light source).
Humans can see a full range of colors and those colors really
represent the wavelength of the light being seen. Light at a higher,
or lower, wavelength than we can see can be used by a camera sensitive
to that wavelength of light. The camera can see you, but you cannot
see that it is seeing you.
Most of the IR cameras use lower wavelength light – called
Infra-red or IR. These cameras have a huge light bulb with a special
filter which allows only invisible to us IR light through the
filter. Other brands use hundreds of small semiconductor illuminators
in a huge flat panel – LEDs. With a bright enough IR light
source these cameras can see for several miles.
These cameras cannot see through fog or rain or snow or a sand
storm or even haze. They cannot see any better than you can with
your own eyes -- if you could see IR. This can be very bad if
there is fog or rain or snow or a sand storm or haze and gang
members or drug smugglers are coming across the border and your
job is to see them.
Again, the cameras can “see” objects through the
obscurant if enough light gets through the obscurant. For example,
they – just as you – can see brake lights of a distant
car right through the fog.
You might contact your congressman and askl him
to start protecting you and your family from the border threat
by funding the United States Border Patrol.