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Optical
Fiber Pressure & Motion Test Circuit
By: Dave Johnson Optical fibers have been
used for detecting motion and pressure for quite a few decades now. If you
would like to experiment with this interesting technique, you can use the circuit
below. The circuit uses an off-the-shelf
bright red LED light source, designed
for plastic optical fibers. It also
uses a matching phototransistor light detector. The devices are designed
for plastic fiber. I would suggest you keep the total fiber length less
than 50 feet. Bending or stepping on the fiber will produce a detectable
output signal. |
