1 September 1996 Low-frequency harmonic vibration analysis with double-pulsed addition electronic speckle pattern interferometry
Author Affiliations +
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.
Andrew John Moore, Carlos Perez-Lopez, "Low-frequency harmonic vibration analysis with double-pulsed addition electronic speckle pattern interferometry," Optical Engineering 35(9), (1 September 1996). https://doi.org/10.1117/1.600869 . Submission:
JOURNAL ARTICLE
10 PAGES


SHARE
Back to Top