Development And Application Of A Fibre Optic Electronic Speckle Pattern Interferometer (ESPI)

Jeremy C. Davies; CIive H. Buckberry; Julian D.C. Jones; Chris N. Panell

doi:10.1117/12.943506

1 June 1988 Development And Application Of A Fibre Optic Electronic Speckle Pattern Interferometer (ESPI)

Jeremy C. Davies, CIive H. Buckberry, Julian D.C. Jones, Chris N. Panell

Proceedings Volume 0863, Industrial Optoelectronic Measurement Systems Using Coherent Light; (1988) https://doi.org/10.1117/12.943506
Event: 1987 Symposium on the Technologies for Optoelectronics, 1987, Cannes, France

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.

Citation Download Citation

Jeremy C. Davies, CIive H. Buckberry, Julian D.C. Jones, and Chris N. Panell "Development And Application Of A Fibre Optic Electronic Speckle Pattern Interferometer (ESPI)", Proc. SPIE 0863, Industrial Optoelectronic Measurement Systems Using Coherent Light, (1 June 1988); https://doi.org/10.1117/12.943506

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