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Phase-stepped additive stroboscopic fiber optic TV holography for vibration analysis

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Phase-stepped additive stroboscopic fiber optic TV holography for vibration analysis

Fernández Doval, Ángel Manuel; Fernández Fernández, José Luis; Perez-Martinez Perez-Amor, Mariano Jesus; Valera, Jesus D. R.; Jones, Julian D. C.
 
DATE : 1994-11-15
UNIVERSAL IDENTIFIER : http://hdl.handle.net/11093/1253
UNESCO SUBJECT : 3311.11 Instrumentos Opticos ; 2209.07 Holografía ; 2201.11 Vibraciones
DOCUMENT TYPE : conferenceObject

ABSTRACT :

A novel technique for out-of-plane vibration analysis combining synchronous phase-stepping with additive stroboscopic TV holography and its implementation on a fiber optic electronic speckle pattern interferometer (FOESPI) are presented. Stroboscopic pulse-to-pulse (high frequency) as well as TV frame-to-frame (low frequency) phase-stepping of the reference arm are combined, with this scheme position of additive fringes is shifted yielding a series of frames (correlograms) which are then processed using conventional phase-stepping algorithms to obtain a phase-map of the vibrating object. A restriction of this technique, taking only two contrast-inverted correlograms for sequential subtraction, is also demonstrated for real-time visibility enhancement of additive fringes.

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