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Proceedings Paper

Simultaneous laser vibrometry on multiple surfaces with a single beam system using range-resolved interferometry
Author(s): Thomas Kissinger; Thomas O. H. Charrett; Stephen W. James; Alvin Adams; Andrew Twin; Ralph P. Tatam
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Paper Abstract

A novel range-resolved interferometric signal processing technique that uses sinusoidal optical frequency modulation is applied to multi-surface vibrometry, demonstrating simultaneous optical measurements of vibrations on two surfaces using a single, collimated laser beam, with a minimum permissible distance of 3.5 cm between surfaces. The current system, using a cost-effective laser diode and a fibre-coupled, downlead insensitive setup, allows an interferometric fringe rate of up to 180 kHz to be resolved with typical displacement noise levels of 8 pm Hz-0.5. In this paper, the system is applied to vibrometry measurements of a table-top cryostat, with concurrent measurements of the optical widow and the sample holder inside. This allows the separation of common-mode vibrations of the whole cryostat from differential vibrations between the window and the sample holder.

Paper Details

Date Published: 22 June 2015
PDF: 7 pages
Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 952520 (22 June 2015); doi: 10.1117/12.2183281
Show Author Affiliations
Thomas Kissinger, Cranfield Univ. (United Kingdom)
Thomas O. H. Charrett, Cranfield Univ. (United Kingdom)
Stephen W. James, Cranfield Univ. (United Kingdom)
Alvin Adams, Oxford Instruments plc (United Kingdom)
Andrew Twin, Oxford Instruments plc (United Kingdom)
Ralph P. Tatam, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 9525:
Optical Measurement Systems for Industrial Inspection IX
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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