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Optical Engineering

Low-frequency harmonic vibration analysis with double-pulsed addition electronic speckle pattern interferometry
Author(s): Andrew John Moore; Carlos Perez-Lopez
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Paper Abstract

We describe the control of a pulsed laser for measuring harmonic vibrations with double-pulsed addition electronic speckle pattern interferometry (ESPI). The basic requirement is to synchronize the laser pulses both to a known position of the object vibration cycle (to obtain a stationary fringe pattern) and to a charge coupled device (CCD) camera (to obtain one double pulse per field.) It is shown theoretically and experimentally that at low object-vibration frequencies (typically < 500 Hz) these synchronization requirements can cause instabilities in the laser output. A synchronization scheme to overcome these problems is described and experimental results presented at several low objectvibration frequencies. Addition fringe visibility is improved in real-time with an electronic filter.

Paper Details

Date Published: 1 September 1996
PDF: 10 pages
Opt. Eng. 35(9) doi: 10.1117/1.600869
Published in: Optical Engineering Volume 35, Issue 9
Show Author Affiliations
Andrew John Moore, Ctr. de Investigaciones en Optica, A.C. (United Kingdom)
Carlos Perez-Lopez, Ctr. de Investigaciones en Optica, A.C. (Mexico)


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