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reducing IR pollution.

Is there a way to reduce the range / effect of a ir based remote
control.

I work for a Pay tv company and we have many set top boxes on our
desks for testing and monitoring. I find that as the STBs and remotes
are designed to work across many metres, we suffer from reflection. IR
bouncing all over the place. The STBs are usually controlled within
10-20 cm of the remote. So I am hoping to filter, attenuate or
something the IR from the remote. When I have a solution, I will
implement it in all remotes in the office.

I have heard of placing colour plastic or paper in the remote,
experiments have not been very successful.

I am more than happy to modify the remote by adding a resister in
series. I can get access to both legs of the LED rather easily without
pulling it all apart.

Ideas, thoughts, suggestions?
 
P

Phil Allison

Jan 1, 1970
0
Is there a way to reduce the range / effect of a ir based remote
control.

I work for a Pay tv company and we have many set top boxes on our
desks for testing and monitoring. I find that as the STBs and remotes
are designed to work across many metres, we suffer from reflection. IR
bouncing all over the place. The STBs are usually controlled within
10-20 cm of the remote. So I am hoping to filter, attenuate or
something the IR from the remote. When I have a solution, I will
implement it in all remotes in the office.

I have heard of placing colour plastic or paper in the remote,
experiments have not been very successful.



** Try a piece of thin black card, like a business card, that is black on
one or both sides - over the IR LED .

Reduces the range to under a meter for me.



....... Phil
 
P

Puckdropper

Jan 1, 1970
0
[email protected] wrote in @y5g2000hsa.googlegroups.com:
Is there a way to reduce the range / effect of a ir based remote
control.

I work for a Pay tv company and we have many set top boxes on our
desks for testing and monitoring. I find that as the STBs and remotes
are designed to work across many metres, we suffer from reflection. IR
bouncing all over the place. The STBs are usually controlled within
10-20 cm of the remote. So I am hoping to filter, attenuate or
something the IR from the remote. When I have a solution, I will
implement it in all remotes in the office.

I have heard of placing colour plastic or paper in the remote,
experiments have not been very successful.

I am more than happy to modify the remote by adding a resister in
series. I can get access to both legs of the LED rather easily without
pulling it all apart.

Ideas, thoughts, suggestions?

IR is a form of light, and subject to the same behavior as most regular
light. Therefore, to reduce the range of the IR remote, simply dim the
light, or reduce where the light can go. I'd try building some basic
shields out of black construction paper (the color and texture should
reduce the reflection) and see if it solves your problem.

Puckdropper
 
R

Rich Grise

Jan 1, 1970
0
IR is a form of light, and subject to the same behavior as most regular
light. Therefore, to reduce the range of the IR remote, simply dim the
light, or reduce where the light can go. I'd try building some basic
shields out of black construction paper (the color and texture should
reduce the reflection) and see if it solves your problem.

I was going to suggest the black construction paper - it should reduce
reflections considerably.

And maybe look into "neutral density filters" which you should be able
to get the calibration curves on (i.e., attenuation vs. wavelength).

Good Luck!
Rich
 
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