> I've used fiber optic cable for that exact purpose. You can use it for
> both illumination and sensing. It's neat because it reduces the mass you
> need to zip around. Back when I did it (1985?) you could just use a
> fiber emitter and detector pair. Nowadays they probably integrate
> electronics into them, which might get in the way of what you want to
> do. But you could always hack together some way to couple fiber to an
> led and a photodiode.
>
> Cheerful regards,
>
> Bob

That's an interesting idea! Another idea is a photodiode for a sensor and
a laser diode for illumination. The laser diode would light a very small
area so you would not need much, if any, optics on the detector.

Harold


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