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16 January 1988 Developments In Electronic Speckle Pattern Interferometry For Automotive Vibration Analysis.
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Proceedings Volume 0952, Laser Technologies in Industry; (1988)
Event: Laser Technologies in Industry, 1988, Porto, Portugal
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 CCD camera transceiver, flexibly connected by 40m of monomode 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. Phase modulation of the reference beam 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 implementation enables speckle free, time-average vibration maps to be generated in real-time on large, unstable structures. Example results for a four cylinder power unit, a vehicle body shell component and an engine oil pan are included. In all cases the analysis was conducted in a general workshop environment without the need for vibration isolation facilities.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jeremy C. Davies, Clive H. Buckberry, Julian D. C. Jones, and Chris N. Pannell "Developments In Electronic Speckle Pattern Interferometry For Automotive Vibration Analysis.", Proc. SPIE 0952, Laser Technologies in Industry, (16 January 1988);

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