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Sensor Forum Detection sensor for tungsten wires
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  • Replies 13 replies
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  • sensor
Related

Detection sensor for tungsten wires

bijoythomaschandy
bijoythomaschandy over 2 years ago

Hi Guys, Any ideas on what sensor to get to detect the presence/absence of a tungsten wire with a diameter of 0.5mm?

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  • Workshopshed
    Workshopshed over 2 years ago +2
    You could apply a large voltage and current to it, if there is a tungsten wire then it will glow. But not for long.
  • dougw
    dougw over 2 years ago in reply to bijoythomaschandy +2
    A non-contact metal detector doesn't induce hazardous voltages. But what about feeding it through a ferrule that optically detects when no wire is in the hole?
  • shabaz
    shabaz over 2 years ago +1
    Hi, As you no doubt know, your question has insufficient information, and zero context. You might need to give that some thought and then come back with the detail if you wish. Placing this here not…
  • shabaz
    shabaz over 2 years ago

    Hi,

    As you no doubt know, your question has insufficient information, and zero context. You might need to give that some thought and then come back with the detail if you wish.

    Placing this here not because it's rude, but because it's true:

    image

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  • dougw
    dougw over 2 years ago

    Does it need to be non-contact?

    Tungsten is conductive so it could complete a circuit - act like a switch.

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  • mp2100
    mp2100 over 2 years ago

    The answer is,Yes!

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  • Workshopshed
    Workshopshed over 2 years ago

    You could apply a large voltage and current to it, if there is a tungsten wire then it will glow. But not for long.

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  • dougw
    dougw over 2 years ago

    You could use eddy current detection with pulse induction - like a metal detector.

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  • bijoythomaschandy
    bijoythomaschandy over 2 years ago

    Just to add more context. I am putting together a machine that bends tungsten wires into a specific shape. The wire is dispensed from a 5-10m roll. I am looking for a non contact sensor that would let me know when the wire is depleted.

    Unfortunately due to safety reasons( and for the end application of the wire) as the machine is half way through with allowances for minor mods, I won't be able to apply any kind of voltage into it.

    Would be glad to provide further information if need be. Thanks guys.

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  • dougw
    dougw over 2 years ago in reply to bijoythomaschandy

    A non-contact metal detector doesn't induce hazardous voltages.

    But what about feeding it through a ferrule that optically detects when no wire is in the hole? 

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  • bijoythomaschandy
    bijoythomaschandy over 2 years ago in reply to dougw

    Thanks Dougw. That's a great idea. Any recommendations on where I could buy them? Or what is it commercially called? 

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  • michaelkellett
    michaelkellett over 2 years ago in reply to bijoythomaschandy

    How about a micro switch with small roller.

    0,5mm tungsten wire will be quite stiff.

    I found these on Farnell, there are lots more:

    image

    MK

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  • dougw
    dougw over 2 years ago in reply to bijoythomaschandy

    Newark calls them "photo interrupter" but they are a type of optocoupler.

    photo interrupter  photo interrupter for pcb

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