G
Guest
- Jan 1, 1970
- 0
Hi,
Every body know about the IR remote controls that we use everyday for our
TV, music set etc. They are short range, almost omni direction (due to
reflections from almost any surface) controllers.
Imagine that we have a tube/pipe of some sort with radius R, and lenth L. We
have positioned the IR transmiter at the end of this tube and alligned it in
such a way that its illimunation axis parallel to the tube so that the IR
source can only be visible if the observer/receiver aligned with the
tube/pipe. BUT the inner surface of the pipe/tube must be coating with an IR
absorbing material so that the tube will not act as a wave guide. Or the
tube/pipe must be made out of an IR absorbing material.
Do you know any IR absorbing material?
Is it possible to collimate the IR light source with the above mentioned
method to 2degrees? OR is there a way of creating very narrow IR light
cone ie. collimation around 2degree?
If we use an ordinary IR remote control receiver (or some other low-cost IR
sensor) to detected the IR light about 100 meters away from the collimated
IR source how much IR power (how many IR LEDs or what else) we need?
Thanks
Rico Maxle
Every body know about the IR remote controls that we use everyday for our
TV, music set etc. They are short range, almost omni direction (due to
reflections from almost any surface) controllers.
Imagine that we have a tube/pipe of some sort with radius R, and lenth L. We
have positioned the IR transmiter at the end of this tube and alligned it in
such a way that its illimunation axis parallel to the tube so that the IR
source can only be visible if the observer/receiver aligned with the
tube/pipe. BUT the inner surface of the pipe/tube must be coating with an IR
absorbing material so that the tube will not act as a wave guide. Or the
tube/pipe must be made out of an IR absorbing material.
Do you know any IR absorbing material?
Is it possible to collimate the IR light source with the above mentioned
method to 2degrees? OR is there a way of creating very narrow IR light
cone ie. collimation around 2degree?
If we use an ordinary IR remote control receiver (or some other low-cost IR
sensor) to detected the IR light about 100 meters away from the collimated
IR source how much IR power (how many IR LEDs or what else) we need?
Thanks
Rico Maxle