Philip Galanter wrote:
> At 11:49 AM -0400 5/6/03, Sid Weaver wrote:
>> Good morning, Anand
>>
>> I have several IR transceivers working here and  I have never found
>> anything that is transparent to IR.  It is just like my sonar - if
>> there is ANYTHING in front of it, it is going to reflect.
>
> What about needing to evenly diffuse IR?
>
> I need to have an omnidirectional source relative to a plane using a
> single LED.  You know those flashlights the ground crew uses to
> direct an airliner into the gate?  How they have a sort of tube or
> cone clipped on to make a nice torch effect?  I've wondered if I
> could insert the LED into a small solid tube of styrofoam or some
> such to spread the IR out evenly in all directions...or at least all
> directions on a plane.
>
> What material would efficiently diffuse the IR this way?  Or is there
> a better way (other than using  multiple LEDs)?
>
> Phil


Think about a small cylinder in acrylic. A broken window blinder twister
can produce several of those... ;)
Make a small hole in one side to insert the LED, now sand the cylinder
completely so it turns to be all opaque.  Sand the LED face too, so it will
be difuse and will spread light all around.  Probably, probably, you will
have all the cylinder iluminated. It worths the try. You can try without
sanding the LED, but I guess it will only iluminate the top of the
cylinder.  Of course for a larger cylinder I would use several high
intensity LEDs, mostly the rectangular ones used in the new car's rear
blinkers and lamps substitutes.

Wagner.

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