Combined fibre optic laser velocimeter and electronic speckle pattern interferometer with a common reference beam

J. D. Valera, A. F. Doval, J. D C Jones

Research output: Contribution to journalArticle

Abstract

A novel optical fibre system, for out-of-plane vibration analysis comprising the complementary techniques of laser velocimetry and electronic speckle pattern interferometry, is described. The laser velocimeter (LV) and the electronic speckle pattern interferometer (ESPI) share a common reference arm and phase modulator. The LV locks to the motion of a point on the vibrating surface and since the ESPI and LV share a common reference arm, automatic heterodyning of the time-averaged ESPI fringes is achieved. The experimental results are described.

Original languageEnglish
Pages (from-to)289-293
Number of pages5
JournalEngineering Optics
Volume6
Issue number3
Publication statusPublished - Aug 1993

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