Contrast enhanced and phase controlled stroboscopic additive fibre optic TV-holography for whole field out-of-plane vibration analysis

Angel F. Doval, José L. Fernández, Mariano Pérez-Amor, J. D R Valera, J. D C Jones

Research output: Contribution to journalArticle

Abstract

A new technique for real-time contrast enhancement and phase control of fringes in additive stroboscopic TV-holography applied to out-of-plane vibration analysis and its implementation on a fibre-optic electronic speckle pattern interferometer (FOESPI) are presented. Synchronous stroboscopic illumination, firing two pulses per object vibration period, is combined with simultaneous inter-pulse (high frequency) and inter-frame (low frequency) phase modulation in the reference arm of the ESPI yielding a sequence of frames (interferograms) that are grabbed and processed in real-time. With this technique both speckle and fringe phases are independently controlled by means of the parameters of modulation enabling speckle contrast inversion, as required to enhance the visibility of fringes by sequential subtraction, as well as dynamic fringe phase shifting to solve peak-valley ambiguities. Copyright © 1996 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)323-342
Number of pages20
JournalOptics and Lasers in Engineering
Volume25
Issue number4-5
Publication statusPublished - Oct 1996

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holography
fiber optics
vibration
phase control
speckle patterns
pulses
visibility
subtraction
phase modulation
ambiguity
frequency modulation
valleys
interferometry
interferometers
illumination
inversions
low frequencies
modulation
augmentation
electronics

Cite this

Doval, Angel F. ; Fernández, José L. ; Pérez-Amor, Mariano ; Valera, J. D R ; Jones, J. D C. / Contrast enhanced and phase controlled stroboscopic additive fibre optic TV-holography for whole field out-of-plane vibration analysis. In: Optics and Lasers in Engineering. 1996 ; Vol. 25, No. 4-5. pp. 323-342.
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abstract = "A new technique for real-time contrast enhancement and phase control of fringes in additive stroboscopic TV-holography applied to out-of-plane vibration analysis and its implementation on a fibre-optic electronic speckle pattern interferometer (FOESPI) are presented. Synchronous stroboscopic illumination, firing two pulses per object vibration period, is combined with simultaneous inter-pulse (high frequency) and inter-frame (low frequency) phase modulation in the reference arm of the ESPI yielding a sequence of frames (interferograms) that are grabbed and processed in real-time. With this technique both speckle and fringe phases are independently controlled by means of the parameters of modulation enabling speckle contrast inversion, as required to enhance the visibility of fringes by sequential subtraction, as well as dynamic fringe phase shifting to solve peak-valley ambiguities. Copyright {\circledC} 1996 Elsevier Science Ltd.",
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Contrast enhanced and phase controlled stroboscopic additive fibre optic TV-holography for whole field out-of-plane vibration analysis. / Doval, Angel F.; Fernández, José L.; Pérez-Amor, Mariano; Valera, J. D R; Jones, J. D C.

In: Optics and Lasers in Engineering, Vol. 25, No. 4-5, 10.1996, p. 323-342.

Research output: Contribution to journalArticle

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AU - Valera, J. D R

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AB - A new technique for real-time contrast enhancement and phase control of fringes in additive stroboscopic TV-holography applied to out-of-plane vibration analysis and its implementation on a fibre-optic electronic speckle pattern interferometer (FOESPI) are presented. Synchronous stroboscopic illumination, firing two pulses per object vibration period, is combined with simultaneous inter-pulse (high frequency) and inter-frame (low frequency) phase modulation in the reference arm of the ESPI yielding a sequence of frames (interferograms) that are grabbed and processed in real-time. With this technique both speckle and fringe phases are independently controlled by means of the parameters of modulation enabling speckle contrast inversion, as required to enhance the visibility of fringes by sequential subtraction, as well as dynamic fringe phase shifting to solve peak-valley ambiguities. Copyright © 1996 Elsevier Science Ltd.

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