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Sensing touch on large metal frame

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cubeflake:
Hi all!

I'm kind of stuck with an interesting problem and I was wondering if anyone has an idea on how to proceed. A client of mine has an arts object that consists of a relatively large steel frame (like a painting) and they want to detect a person touching the frame.

They were trying capacitive sensing, using the frame as the sensing element but the change in capacitance between touching/non-touching is too small to detect reliably.

We are now considering sensing the 50 Hz noise that a person always picks up, but that would be quite location dependent, so also not ideal. Another approach is was thinking of is to use a load cell, but I'm not sure if that would be sensitive enough to detect touch.

Any ideas?

Cheers!

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