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'[EE]: Source for IR-transparent plastic?'
2002\05\13@060200 by Alan B. Pearce

face picon face
>To avoid this problem you can sand the
>inner surface of the perspex slightly
>- that is what i do when i use IR-photobeam
>reflective sensors.

The other trick is to scribe/saw a small groove between the transmitting and
receiving sensor points and fit a piece of black paper between the sensors,
and sitting/glued in the groove. This means the only reflection you get is
from the outer surface after the light has entered the plastic.

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