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Optical Engineering

Noise reduction in twin-pulsed addition electronic speckle pattern interferometry fringe patterns
Author(s): Fernando Mendoza Santoyo; Andrew John Moore; John Raymond Tyrer; Noe Alcala Ochoa
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Paper Abstract

Addition fringe patterns are obtained in real time with electronic speckle pattern interferometry (ESPI) when two pulses are fired within a single field of a COD camera, i.e., within 1/50 s. The ability to use ESPI in this manner means that target deformation can be studied in very severe environments. A major drawback is that the addition fringes are intrinsically noisy and of very low contrast, impeding a full analysis of the deformation. Experimental results are presented for two methods of reducing noise in addition fringe patterns: subtraction of a reference frame and subtraction of addition fringe patterns. The subtraction procedure leads to high-contrast fringes, which can contain information of both target deformation and rigid body motion. An analytical representation of this behavior is presented.

Paper Details

Date Published: 1 May 1994
PDF: 5 pages
Opt. Eng. 33(5) doi: 10.1117/12.164327
Published in: Optical Engineering Volume 33, Issue 5
Show Author Affiliations
Fernando Mendoza Santoyo, Ctr. de Investigaciones en Optica, A.C. (Mexico)
Andrew John Moore, Centro de Investigaciones en Optica, A.C. (United Kingdom)
John Raymond Tyrer, Loughborough Univ. of Technology (United Kingdom)
Noe Alcala Ochoa, Ctr. de Investigaciones en Optica, A.C. (Mexico)

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