Optical Sensor vs Optical Encoder
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Posted by on August 30, 2006, 7:06 pm
Please log in for more thread options Are those two the same thing? http://www.mouser.com/catalog/627/1256.pdf | |||||||||||||||||||||||||
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Posted by Chris on August 30, 2006, 8:44 pm
Please log in for more thread options quanghoc@gmail.com wrote: http://en.wikipedia.org/wiki/Shaft_encoder http://en.wikipedia.org/wiki/Optoelectronics | |||||||||||||||||||||||||
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Posted by Jonathan Kirwan on August 30, 2006, 10:17 pm
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On 30 Aug 2006 16:06:49 -0700, quanghoc@gmail.com wrote: >Are those two the same thing?
>http://www.mouser.com/catalog/627/1256.pdf The first one on the page includes a 1/8" steel shaft. You might put a knob on the end of it for a manual control of some kind. The next one accepts a keyed shaft, as I gather it. These are some of the most outrageously expensive units I've seen in my life, though. I guess you really pay for the 1024 PPR. But I'd consider the idea of learning how to make my own at that price and then go into a business competing with them. Sheesh! Jon | |||||||||||||||||||||||||
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Posted by Chris on August 30, 2006, 10:43 pm
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Jonathan Kirwan wrote: > On 30 Aug 2006 16:06:49 -0700, quanghoc@gmail.com wrote:
> > >Are those two the same thing?
> >http://www.mouser.com/catalog/627/1256.pdf >
> The first one on the page includes a 1/8" steel shaft. You might put > a knob on the end of it for a manual control of some kind. The next > one accepts a keyed shaft, as I gather it. > > These are some of the most outrageously expensive units I've seen in > my life, though. I guess you really pay for the 1024 PPR. But I'd > consider the idea of learning how to make my own at that price and > then go into a business competing with them. Sheesh! > > Jon Hi, Mr. Kirwan. Sadly, these *are* reasonably priced. BEI has a reputation as one of the most reliable industrial optical encoders, and they always are within specified tolerance. Thus it has always been. Precision optics (they photomask the quadrature pattern onto a glass disk), a small electronics board and a lot of manual assembly labor. If you can figure out a way to beat their price, I'll be standing at the head of the line. Cheers Chris | |||||||||||||||||||||||||
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Posted by Greg Hansen on August 31, 2006, 11:31 am
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Chris wrote: > Jonathan Kirwan wrote:
> >>On 30 Aug 2006 16:06:49 -0700, quanghoc@gmail.com wrote:
>> >> >>>Are those two the same thing?
>>>http://www.mouser.com/catalog/627/1256.pdf >>
>>The first one on the page includes a 1/8" steel shaft. You might put >>a knob on the end of it for a manual control of some kind. The next >>one accepts a keyed shaft, as I gather it. >> >>These are some of the most outrageously expensive units I've seen in >>my life, though. I guess you really pay for the 1024 PPR. But I'd >>consider the idea of learning how to make my own at that price and >>then go into a business competing with them. Sheesh! >> >>Jon >
> > Hi, Mr. Kirwan. Sadly, these *are* reasonably priced. BEI has a > reputation as one of the most reliable industrial optical encoders, and > they always are within specified tolerance. Oh, $200 isn't so bad. They can get a lot more expensive that that. I've used one that returned absolute angle with a precision somewhere in the arcsecond or milliarcsecond regime-- sitting still on a fixed shaft, it showed constant angle fluctuations from the vibrations in the floor and the air. The glass disk reflected rainbow colors, like a CD. I'm not the one who bought that one, but I know the price tag was in the thousands. | |||||||||||||||||||||||||
> http://www.mouser.com/catalog/627/1256.pdf