360 degree non-contact rotational indicator
360 degree non-contact rotational indicator
(OP)
While there are many rotational function generators that give 360 ppr, they rely on direct coupling to a rotating shaft. What I am looking for is a way to place 360 marks, painted bars, reflective strips, etc. on one section of a flat 12 inch diameter coupling, and using something like a bar code reader to generate 360 pulses directly for a TTL logic device. This is for a 1200 rpm 200 hp electric motor driven compressor that has no free shaft for direct coupling. A 1/rev pulse is not a good option as we need to stay syncronized to the crank for research purposes. I have searched this site and many others without finding a source. Any ideas would be appreciated.





RE: 360 degree non-contact rotational indicator
There are also absolute encoders that use various multi-bit codes (such as Gray Codes) that define the position directly.
If you can only find the sensor, then the rest could be done in fairly straightforward software.
Think about latency. "It's exactly here some time ago."
RE: 360 degree non-contact rotational indicator
RE: 360 degree non-contact rotational indicator
Dan - Owner

http://www.Hi-TecDesigns.com
RE: 360 degree non-contact rotational indicator
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: 360 degree non-contact rotational indicator
I used one to sense liquid level with a 'Delco Eye' type extension. It worked fine. That was a long time ago...
Mike Halloran
Pembroke Pines, FL, USA
RE: 360 degree non-contact rotational indicator
Another option would be to use a Grey coded strip with several sensors, you could print it on paper and laminate it.
Let us know what you end up with.
Roy
RE: 360 degree non-contact rotational indicator
htt
I see a 120 tooth gear at 5" diameter. You will probably have to find another supplier for a 360 tooth gear or sprocket. But it seems you have plenty of room. Their sensors and meters will work with any gear that has sufficiently large teeth.
There are meters that count pulses and there are others that calculate speed from period between pulses.
RE: 360 degree non-contact rotational indicator
http://www.ia.omron.com/product/18.html
RE: 360 degree non-contact rotational indicator
Until it gets dirty!
Has the OP abandoned us? Some more information about the application would be helpful in identifying the best solution.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: 360 degree non-contact rotational indicator
Charlie
RE: 360 degree non-contact rotational indicator
RE: 360 degree non-contact rotational indicator
RE: 360 degree non-contact rotational indicator
Another "optical" option might be a high speed vision system programmed to read the code you've printed on the circumferential tape.
RE: 360 degree non-contact rotational indicator
http://www.renishaw.com/en/6453.aspx
RE: 360 degree non-contact rotational indicator
----------------------------------
If we learn from our mistakes I'm getting a great education!