Computer-Aided Evaluation of Holographic Interferograms

Kreis, Thomas

doi:10.1007/978-3-540-48078-5_6

Cited by 22 publications

(15 citation statements)

References 66 publications

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“…3͑a͒ to 3͑p͒ by using a Fourier transform method similar to the one proposed by Kreis for the analysis of holographic interferograms. 16 This fringe analysis uses a single interferogram and filters out the residual speckle noise that contaminates the correlation fringes. It can be shown that the Fourier transform of a cosinusoidal fringe pattern yields a zero frequency peak and two components of opposite sign that carry the phase information of the fringes.…”

Section: Resultsmentioning

confidence: 99%

Measurement of the temporal evolution of periodic induced displacement derivatives using stroboscopic electronic speckle-shearing interferometry

et al. 2001

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Single pulsed subtraction electronic speckle-shearing pattern interferometry is used to measure the time evolution of deformations induced by periodic impulse loading on a metal plate. This is accomplished with a stroboscopic system based on a pulsed laser and an interline-transfer CCD camera running at 60 frames/s. In a few seconds, a sequence of hundreds of interferograms is recorded with an effective sampling time interval of some tens of microseconds. We describe the experimental setup used to generate the transient deformation on the metal plate and also the synchronization of laser pulses and image acquisition. Several correlation fringe patterns are presented, showing the time evolution of the deformation. Finally, these data are used to calculate optical phase maps and displacement derivative fields for different times after the application of the dynamic load on the object.

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Section: Resultsmentioning

confidence: 99%

Measurement of the temporal evolution of periodic induced displacement derivatives using stroboscopic electronic speckle-shearing interferometry

et al. 2001

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“…This conditions assures that the phase 'Pm (x, y) of the distorted interference fringe pattern Im (x, y) is monotonic in the horizontal direction. In order to develop the analysis let us introduce the following quantities Cm (x,y)=1b (x,y)exp{i['-P, (x,y)+P(x,y)1 (6) C1 (x, y)= 1br (x, y)exp[iP, (x, y)1…”

Section: Tile Fourier Transform Methodsmentioning

confidence: 99%

Fourier-transform-based interferometric technique for measuring the elastic anisotropy of a dye-doped liquid crystal

Feo¹,

Nicola

Ferraro

et al. 1999

SPIE Proceedings

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In this paper we describe an interferometric technique based on high precision two-dimensional spatial fringe analysis Fourier method for measuring the elastic constants of nematic liquid crystals. Since the determination of the elastic anisotropy relies on the measurement ofthe ratios between the elastic constants, this technique provides a powerful and high accuracy method for characterising nematic liquid crystals.

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“…13,15 Alternatively, there exist a number of methods that may be regarded as the spatial counterparts of temporal phase-shifting methods. 21,22 The latter require several interferograms to be recorded, each corresponding to a particular shift of the reference's phase; the phase estimation is done at each pixel by using the pixels at the same location in the other interferograms. In contrast, spatial phase-shifting algorithms 17,[23][24][25][26][27][28] use the neighboring pix- els (on the same line) of a single interferogram to carry out the estimations.…”

Section: B Other Related Techniquesmentioning

confidence: 99%

Complex-wave retrieval from a single off-axis hologram

2004

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We present a new digital two-step reconstruction method for off-axis holograms recorded on a CCD camera. First, we retrieve the complex object wave in the acquisition plane from the hologram's samples. In a second step, if required, we propagate the wave front by using a digital Fresnel transform to achieve proper focus. This algorithm is sufficiently general to be applied to sophisticated optical setups that include a microscope objective. We characterize and evaluate the algorithm by using simulated data sets and demonstrate its applicability to real-world experimental conditions by reconstructing optically acquired holograms.

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Computer-Aided Evaluation of Holographic Interferograms

Cited by 22 publications

References 66 publications

Measurement of the temporal evolution of periodic induced displacement derivatives using stroboscopic electronic speckle-shearing interferometry

Measurement of the temporal evolution of periodic induced displacement derivatives using stroboscopic electronic speckle-shearing interferometry

Fourier-transform-based interferometric technique for measuring the elastic anisotropy of a dye-doped liquid crystal

Complex-wave retrieval from a single off-axis hologram

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