A near field, non-contact vibration detector using giant magnetoresistance sensors
Mickael, Peter Wahba
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Giant magnetoresistance (GMR) sensors are explored for their use in detecting vibrations. GMR sensors have been widely used in magnetoresistive random-access memory (MRAM), and they have the potential to be utilized in many other industries due to their small size and low power consumption. A summary of sensors and transducers used for vibration measurements is given. In addition, an investigation of string vibrations is discussed as the GMR sensors were tested against traditional inductive electric guitar pickups. GMR sensors show a distinct advantage for measuring string vibrations. The GMR device gives an output related to the position of the moving string as opposed to its velocity and displays a flat frequency response. The harmonic spectrum produced is a truer representation of the string dynamics as there is no frequency response introduced by the sensor itself.