Subject:
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FIber-optic rotation sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 21 Dec 1999 16:54:16 GMT
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Viewed:
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411 times
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The fiber-optic device and a light sensor can be rigged to detect at least two
distinct rotation positions of an axle.
The fiber optic device is lit through an electrical connection, and an axle
turns an internal light source, sequentially lighting the eight fibers, as was
related here earlier.
I put two fiber ends in a short grey tube. They barely fit. One came first
with the other behind it. When lit, the front one was very bright. The back
one was distinctly dimmer.
The 1x2 one-hole beam fits directly in front of the sensor of the light
sensor, blocking off the LED, as has been noted here before. I lined the grey
tube up in line with the hole in that short beam and found that the light
sensor could resolve the different intensity between the two fibers.
That gives you a two-position rotation sensor.
If you had a bigger tube you might be able to accomodate more fibers....
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Message has 1 Reply:
 | | Re: FIber-optic rotation sensor
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| (...) [snip] I believe it was Mario that described a way to use the FO device as a rotation detection unit all by itself. Apparently as a side-effect of the rotation the FO device can toggle the pulse counter as well. It can't detect direction like (...) (25 years ago, 21-Dec-99, to lugnet.robotics)
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