Sensor Question

A £1GBP coin is 3mm thick. If it doesn't go in the gap, the gap is smaller than 3mm. If it does, then the gap is >=3mm.

The coin is 22.5mm in diameter.

_{[This equipment is used to set-up facing point locks on mechanically-worked points across the UK's heritage railway network.]}

That's rather an expensive gague, can't you make one up of smaller denomination coins?
Del

Two 50p coins and some Superglue cyanoacrylate adhesive works just as well, though one cannot spend it afterwards.

contraint constraint

Johansson blocks.

Feeler gages. Mount one that is the minimum T and the other at maximum T. Mount them apart and now you have a go/nogo gage.

1. Air Gap Sensor SOPA - Festo
   
2. Airgap Sensors - VibroSystM Inc.
   
3. Thin Capacitive Sensors for Air Gaps - Capacitec
   
4. [PDF]Air Gap Sensor AGS - Mikrotrend

use optic fiber cable with optic sensor which can place remote location and u can detect small things also

u can try in sick website

Can you describe your process a little bit better?

What are the two parts you're trying to detect the gap between?

What material are the the two parts made from?

Is this some sort of automated assembly machine?

Are the two parts you're trying to detect the gap between, part of this assembly machine or are they part of the product the machine is assembling?

You need to give as much information as possible. Otherwise you'll get all sorts of weird and wonderful suggestions, most of which will be totally irrelevant to what you're trying to acheive.

A wedge gauge?

Hello there

Use a linear hall effect sensor and magnet calibrated to the required distance. A readily available PIC board could illuminate an LED if the gap is within tolerance. The sensor will give out a voltage that is related to the distance from a magnet. Note that the voltage is not proportional to distance but to distance squared if I remember correctly.

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