Extension of the displacement measurement range for electronic speckle-shearing pattern interferometry using carrier fringes and a temporal-phase-unwrapping method

Martı́nez-Celorio, R.A.; Dávila, A.; Kaufmann, Guillermo H.; Mendiola, Gabriel

doi:10.1117/1.602423

Cited by 10 publications

(1 citation statement)

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“…One analogy to the extended TESPI technique proposed here is temporal speckle shearing interferometry. 10,11,13 In temporal speckle shearing interferometry one unwraps along the time coordinate the value of the phase gradient, and one obtains the final modulating phase change throughout the experiment by spatial integration.…”

Section: Discussionmentioning

confidence: 99%

Extended-range temporal electronic speckle pattern interferometry

Servı́n¹,

Dávila²,

Quiroga³

2002

Appl. Opt.

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In recent years the availability of high-speed digital video cameras has motivated the study of electronic speckle pattern interferometry ͑ESPI͒ in the time domain. To this end a properly sampled temporal sequence of N-fringe patterns is used to analyze the temporal experiment. Samples of temporal speckle images must fulfill the Nyquist criteria over the time axis. When the transient phenomena under study are too fast, the required sampling frequency over time may not be fulfilled. In that case one needs to extend the measuring range of the algorithm used to extract the modulating phase. We analyze how to use short laser pulses or short video acquisition times with fairly long temporal separation among them to estimate the modulating phase of a dynamic ESPI experiment. The only requirement is that the modulating phase being estimated be properly sampled in the spatial domain.

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Section: Discussionmentioning

confidence: 99%