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Optical Sensor vs Optical Encoder

Discussion in 'Electronic Basics' started by [email protected], Aug 31, 2006.

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  1. Guest

  2. 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
     
  3. Chris

    Chris Guest

    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
     
  4. Greg Hansen

    Greg Hansen Guest

    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.
     
  5. Guest

    The first one on the page includes a 1/8" steel shaft. You might put

    Then I wonder why Mouser put the Optical Encoder under Sensor category.
    Pls check it out in mouser.com
     
  6. I wasn't disparaging them, only noting the cost compared to lower
    resolution optical units I _have_ purchased before (32 and 64 counts
    per rev) for knobs (at $6 each, btw.) I've used 1024PPR encoders
    before for an infusion pump tester, but someone else actually did the
    design and purchase of them, so this was a surprise to me. I accept
    your point that this is reasonable, if too high for anything I'm
    likely to care about in hobby work.

    It does make me more interested in dismantling them, though.
    Hehe. You are buying these things, too?

    I need to look at the complexity of solving the etched/photomasked
    issue. Sounds interesting to think about, anyway. Thanks for the
    info.

    Jon
     
  7. OMG! Now there is an idea! Picking the right CDROM/CD writer combo
    and then writing a certain pattern on the disk, using those smaller CD
    ROMs that are sometimes used by vendors. Then the right pickup design
    for decoding the pattern into pulses.

    Could even purchase the manufacture using custom disk sizes and
    pressed patterns.

    Hmm.

    Jon
     
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