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PICList Thread
'laser filter.@670nm'
1998\11\19@003824 by STEVE TOMES

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     I am working on a pic program to decode modulated and       amplified,
weak, visable laser signals.
     I am looking for a cheep filter, any ideas??
                         Thanks for any thoughts....Steve T

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1998\11\19@070409 by Roland Andrag

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Hello!

>      I am working on a pic program to decode modulated and       amplified,
>weak, visable laser signals.
>     I am looking for a cheep filter, any ideas??
>                         Thanks for any thoughts....Steve T

If this is a one-off project, this might be a solution:

Try getting hold of safety glasses for use with lasers - the are
available in various flavours to block/pass various wavelengths.
Since you are working with red light, you probably want red glasses
to only pass through the red light. ie. You are looking for glasses
designed to block out the shorter wavelengths (ble and green).

Then butcher the glasses and use the lenses as filters.

Cheers
Roland

1998\11\19@081831 by Reginald Neale

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>Hello!
>
>>      I am working on a pic program to decode modulated and       amplified,
>>weak, visable laser signals.
>>     I am looking for a cheep filter, any ideas??
>>                         Thanks for any thoughts....Steve T
>
>If this is a one-off project, this might be a solution:
>
>Try getting hold of safety glasses for use with lasers - the are
>available in various flavours to block/pass various wavelengths.
>Since you are working with red light, you probably want red glasses
>to only pass through the red light. ie. You are looking for glasses
>designed to block out the shorter wavelengths (ble and green).
>
>Then butcher the glasses and use the lenses as filters.
>
>Cheers
> Roland

Another thing that can be "butchered" is discarded remotes and receiver
modules from TVs, VCRs, etc.
Sometimes the filter is really IR and is opaque to visible light; sometimes
it is just deep red. Even if it's not an exact match for your diode, it may
improve the S/N quite a bit by just getting rid of most input at shorter
wavelengths.

Reg Neale

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