An IR Remote Control will not pass through objects such as wood and
metal. It will go through some glass and not others because not all
glass is transparent to infra-red (IR) light.
?Infrared is not to be confused with radio waves or sound waves, it is
basically a light wave and waves are made of energy. Light waves come
in a continuous variety of sizes, frequencies and energies. The amount
of energy in a light wave is proportionally related to its frequency.
Light not only vibrates at different frequencies, it also travels at
?Light waves can move as fast as 186,000 miles per second (in a
vacuum), which makes light the fastest phenomenon in the universe.
Light waves slow down when they travel inside substances, such as air,
water, glass, etc. They cannot pass through solid objects.?
Infrared Data Association ( IrDA)
?Will my TV-B-GoneŽ remote control work through walls or ceilings?
A. No. Because TV-B-GoneŽ remotes work by infra-red (IR) light, it
won't go through walls, ceilings, people, or other objects.
Q. Will my TV-B-GoneŽ remote control work through glass?
A. Sometimes. Even though glass is transparent to visible light, not
all glass is transparent to infra-red (IR) invisible light.
TV-B-GoneŽ, like other remote controls, uses IR light, and so, it will
go through some glass, and not others. ?
?IrDA devices are typically designed for use in line of sight
applications. Because of the nature of infrared light, it penetrates
glass or other transparent objects and reflects off walls, ceiling,
mirrors and other surfaces.?
National Institute of Standards and Technology
?IR-light cannot pass through solid objects, such as walls, but passes
through glass and is reflected by light objects.?
Infrared remote control units cannot shine infrared light through wood doors.
?Infrared (IR) technology uses line-of-sight to operate. That means
that an IR device (transmitter) must be pointing directly towards
another device (receiver) to function properly. For example, most
television remotes and home stereo remotes use IR and must be pointing
toward the device that needs to be controlled in order to operate. If
the IR remote is not pointing directly towards the IR receiver,
Infrared transmissions will not reach the receiver and the device will
not function properly.?
How do these remote control devices work?
"Wireless remotes rely on either infrared light or radio frequency,
said John Naber, an associate professor in electrical and computer
engineering at the University of Louisville. Infrared remotes change
the channels on your TV. Radio frequency (RF) remotes, which use radio
waves, are used for radio-controlled toys.
Infrared frequencies, invisible to the naked eye, ?is limited to
?line-of-sight? conditions, which means the signal can?t go through
opaque objects like walls or doors,? Naber said. ?However, the signal
can transmit through glass, such as glass doors found on home theater
"IR Remote " " through wood OR metal OR glass
I hope the information provided is helpful!