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Date: 11/29/99
Posted by: Gérard D'Ans
E-mail: gdans(at)ulb(dot)ac(dot)be(no spam)
URL: http://www.ulb.ac.be/polytech/laborulb/index.htm

Does anyone know about non-contact torque sensors that operate from the variation of magnetic permeance upon mechanical stresses? Approach their head with a central primary spool to generate variable mag field (carrier) 2 pairs of secondary opposite spools wired differentially into a demodulator to the rotating shaft ferromagnetic surface such that diagonals are 45° from shaft centerline. Then subtract demodulated secondary voltages. You get an image of transient torque. Ten years ago, AEG Kanis produced such sensors. Any other company? Gérard

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