title: Vibration monitoring by using a dynamic proximity sensor with interferometric encoding.
abstract: An optical sensor for the dynamic measurement of proximity is presented. The sensor combines an extrinsic geometric transducer with interferometric encoding for high vibration sensitivity. Static calibration showed a unique variation in interference contrast over at least 60 fringes, leading to a measurement range of 20 mum and a resolution of at least 0.033mum. Dynamic excitation by using low-amplitude vibrations at 3.6 kHz showed a similar contrast variation, verifying fringe discrimination up to the sixth order. With verification of dynamic performance over all 60 fringes, the sensor should offer a low-cost approach to vibration monitoring in electrical switchgear.
authors.forename: T K
authors.initials: TK
authors.lastname: Gangopadhyay
authors.forename: P J
authors.initials: PJ
authors.lastname: Henderson
authors.forename: A D
authors.initials: AD
authors.lastname: Stokes