Electronics > Mechanical & Automation Engineering

Detect presence of a thin wire

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alan.alanzhang@gmail.com:
I have a small gap (5mm-10mm) where a thin Nitinol wire passes through. I'd like to detect the presence/passing through of the Nitinol wire with a sensor. It can be contactless or a contact based sensor. The wire could make direct contact with the sensor but only at the sensor so it doesn't form a complete circuit (the wire dangles from a quad copter drone in mid air while the write enters the gap).

Ideally the sensor detects in under 100ms.

Thank you in advance.

Dan123456:
Would a photo interrupter work?

They are basically an IR LED and IR receive in one and will give 6ou a signal is something blocks the gap.

dobsonr741:
A sketch would be helpful to understand the wire’s position and also to tell why the wire would not be there, or move out of position. Just to avoid becoming a XY problem https://xyproblem.info/

Marco:
IR reflection sensor would be my first pick if it had to be done with minimum engineering.

Capacitive sensing would have the advantage of not responding to non conductive debris.

Infraviolet:
As the wire is thin any IR transmission gap sensor would liekly need to be sensitive with an analogue output, to detect a drop in intensity as the wire crosses rather than a total blocking. Whether reflective IR could work will depend on how shiny the wire's surface finish is.

You want to avoid any sensor that could cause a complete circuit, does that mean a current is running in that wire between the drone and somewhere else, or that the wire is held at a particular voltage? Either of those possibilities would open up more sensing possibilities, Hall sensor ifa current is flowing for example.

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