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Proceedings Paper

Development And Application Of A Fibre Optic Electronic Speckle Pattern Interferometer (ESPI)
Author(s): Jeremy C. Davies; CIive H. Buckberry; Julian D.C. Jones; Chris N. Panell
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Paper Abstract

The incorporation of monomode fibre optics into an argon ion powered Electronic Speckle Pattern Interferometer ( ESPI ) is reported. The system. consisting of an optics assembly linked to the laser and a TV camera tranceiver, flexibly connected by 40m of fibre optic cable to the optics, has been used to analyse the modal behaviour of structures up to 5m X 3m X 2m in size. Frequency modulation of the reference beam phase in order to operate in a heterodyne mode has been implemented using a piezo-electric crystal operating on the monomode fibre. A new mode of operation - Sequential Time-average Subtraction - and the results of a new processing algorithm are also reported. Their impementation enables speckle free, time-average vibration maps to be generated in real-time on large, unstable structures. Example results for a 4 cylinder power train, a vehicle door and a whole vehicle floorpan and bulkhead are included. In all cases the analysis was conducted in a general workshop environment without the need for vibration isolation facilities.

Paper Details

Date Published: 1 June 1988
PDF: 14 pages
Proc. SPIE 0863, Industrial Optoelectronic Measurement Systems Using Coherent Light, (1 June 1988); doi: 10.1117/12.943506
Show Author Affiliations
Jeremy C. Davies, Gaydon Technology Limited (England)
CIive H. Buckberry, Gaydon Technology Limited (England)
Julian D.C. Jones, University of Kent at Canterbury (England)
Chris N. Panell, University of Kent at Canterbury (England)

Published in SPIE Proceedings Vol. 0863:
Industrial Optoelectronic Measurement Systems Using Coherent Light
William F. Fagan, Editor(s)

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