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eye magnetic field sensitivity

Discussion in 'Electronic Design' started by Jamie M, Sep 18, 2012.

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  1. Jamie M

    Jamie M Guest

    Hi all,

    Just a (crazy!) idea: when a rod/cone is energized by light hitting it
    in the eye, this will generate an electric current through the rod, and
    effectively make it a small electromagnet for a short time, which could
    allow it to be sensitive to external magnetic fields.

  2. MrTallyman

    MrTallyman Guest

    Nerve stimulus is an electro-chemical interaction. There is no mag
    field that is of any significance. The photon response the rods and
    cones create is electro-chemical as well, and is very, VERY small.
    Birds do not geo-locate with their eyes, there is a different, directly
    brain connected region where that takes place.

    There is more energy in the nerve axons repeating the data on the way
    to the brain region it ends up in (visual cortex) than there is in the
    original reception at the retinas.
  3. miso

    miso Guest

    There are "epic" photos for years on the internet of things that got too
    close to the MRI.
  4. Martin Brown

    Martin Brown Guest

    Most people just notice the noise from the associated air conditioning.
    Big degaussing coils and air cored mass spectrometer magnets are about
    the most rapid dB/dT you find in common lab experience. I trashed quite
    a few magnetic stripe bank cards when I worked with fast sweep high
    power magnets. Never noticed any interesting sensations at all being
    near them.

    Some of the big hunky supply cables would visibly twitch as the current
    sweep occurred. I always wondered just how long it would be before the
    copper work hardens and snaps!
  5. John S

    John S Guest

    I mentally designed a circuit while it was happening. It sure helped to
    pass the time.
  6. Robert Macy

    Robert Macy Guest

    The Alcoa aluminum plant on the Mississippi River between Iowa and ?
    Illinois uses electric power for their smelting [for better thermal
    control]. They built there and planned on having underground wiring
    from the nearby adjacent power production facility, but could NEVER
    get the leaks, or something, resolved with the underground technique,
    so went to HEAVY lines hanging overhead. Standing at the facility I
    looked out and saw the hanging lines visibly twitching almost touching
    each other. My host commented that that was a 'quiet' day. Often the
    wires hit together with such force [evidently same potential just
    parallel current] they crack together and sound like rifle shots. His
    answer to my asking wasn't that hard on the wires was, yes, they wear
    out about one a year and have to be replaced.
  7. Robert Macy

    Robert Macy Guest

    pray the super conducting magnet doesn't quench abruptly.
  8. Guest

    other than the risk of asphyxiation from the boiling helium if it
    doesn't get vented to the outside is it really that violent?

    I mean it might ruin the magnet and if not it takes weeks to adjust
    after restarting but its not like it is going to explode

  9. Guest

    There are a few examples of MRI quenches on YouTube. I can't look at them
    because my laptop is sick but type "MRI Quench" on the search line.

    It makes a lot of noise.
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