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Comparing laser and polychromatic confocal optical displacement sensors for the 3D measurement of cylindrical artefacts containing microscopic grooved structures. [In special issue: Metrology and Properties of Engineering Surfaces]

By P.J. Boltryk, M. Hill and J.W. McBride

Abstract

A scanning system has been developed for measuring the surface of early cylinder mechanical sound recordings to high precision, both for surface preservation and for post-processing of the data to recover the sound encoded in the grooves. Research has identified that high sensor axial resolution is required to resolve the smallest amplitude groove modulations contained on typical cylinder artefacts resulting in the selection of confocal laser and white light (polychromatic) confocal sensors as suitable sensing technologies. This paper presents data acquired by the two confocal sensor technologies, comparing the measured surface profiles with data obtained using a stylus profilometer. We investigate limitations of the sensors, relating their characteristics to the ongoing development of the scanning system

Topics: TK, TA, QC
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:65567
Provided by: e-Prints Soton

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Citations

  1. (2007). A comparison of precision optical displacement sensors for the 3D measurement of complex surface profiles’, Sens. Actuators A: Phys.
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  3. (2001). Reading and processing of audio information reproduced from Edison phonograph cylinders by method of laser interferometry.
  4. (2007). Signal processing methods for the recovery of audio from early acoustic cylinder recordings, measured via non-contact optical sensor’, accepted for presentation at
  5. (2003). The Syracuse University Library Radius Project: Development of a non-destructive playback system for cylinder recordings."

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