A simple Permalloy proximity transducer

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Abstract
A linear proximity transducer based on the planar magnetoresistance effect in thin Permalloy films is described. Results show that a linear operating range of approximately 0.025 m is possible using this magnetoresistor. Since the transducer can operate at frequencies in excess of 1 MHz, the dynamic characteristics of the system are excellent. Furthermore, as there is no physical contact between shaft and transducer, prolonged continuous operation is possible.