Re: infrared transmitters


"Paul Horwood" <Paul.Horwood@xxxxxxxxxxxx> wrote in message
news:_Gmbe.3139$395.1492@xxxxxxxxxxxxxxxxxxxxxxx
> I wonder if anyone can help me?
>
> I am looking at building a 6 band infrared transmitter.
> Now it seems that most infrared beams are modulated via a high signal like
> 37Khz.
>
> What I want to do is to transmit all the 6 bands at once but on different
> infrared frequencies.
> The frequencies would be for example:- 935,5 - 937,8 - 927,2 - 948,1 -
> 934,2 - 928,3 nm (nanometer) .
>
> How can this be done?
>
> Is there a meter that can be used to determin the frequency of infrared
> light?
>
> Or is there a calculation that can be done to determin which components I
> would need?
>
> Will the standard infrared emitters be capable of narrowed bandwidth like
> this?
>
> Paul...

You want to multiplex by optical frequencies? There is no simple way to do
this. Standard emitters have way to wide a spectrum. It would require Laser
emitters and even then the wavelengths listed are quite close together.
Furthermore, it would take advanced optical processing, spectrum analysis,
etc. to separate the signals when received. But, why do you want to do
this? Why not multiplex with different modulation frequencies or multiplex
with time division at a single mod. frequency. You need to be more specific
about the information you want to transmit and its bandwidth and one of us
can suggest how you might do it.
Bob


.

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