Journal ArticleDOI
Temporal Polarization Phase-shifting for Digital Speckle Pattern Interferometry
TLDR
In this paper, a temporal 4-step phase shift technique for digital speckle pattern interferometry (DSPI) with one fixed and two rotatable polarizers is proposed.Abstract:
A temporal 4-step polarization phase-shifting technique for digital speckle pattern interferometry (DSPI) with one fixed and two rotatable polarizers is proposed. The fixed polarizer is used to filter out the reflected object beam in one polarization direction, and the two rotatable polarizers are used to perform the 4 times phase shifts. The Jones derivation illustrates the object surface phase distribution can be derived from the 4 speckle pattern interferograms, which are bright, gloomy, bright, and gloomy successively. The experiment shows that the proposed temporal polarization phase-shifting technique is able to extract the phase change caused by a tiny out-of-plane displacement. Unlike the PZT-driven phase-shifting, the polarization phase-shifting in this method is stable and accurate in the long term.read more
Citations
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Journal ArticleDOI
Panoramic dual-directional shearography assisted by a bi-mirror.
TL;DR: A panoramic dual-directional shearography system is proposed to simultaneously determine out-of-plane deformation derivatives in two directions and globally inspect the object to be tested and theoretical analysis and experimental results demonstrated the utility of the system.
References
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Journal ArticleDOI
Two-dimensional windowed Fourier transform for fringe pattern analysis: Principles, applications and implementations
TL;DR: Two algorithms, one based on filtering and the other based on similarity measure, are developed and some applications based on these two algorithms are explored, including strain determination, phase unwrapping, phase-shifter calibration, fault detection, edge detection and fringe segmentation.
Journal ArticleDOI
Fourier-transform speckle profilometry: three-dimensional shape measurements of diffuse objects with large height steps and/or spatially isolated surfaces
Mitsuo Takeda,Hirokazu Yamamoto +1 more
TL;DR: Experimental results are presented that demonstrate the validity of the principle and Unlike conventional moiré techniques the proposed technique permits the objects to have discontinuous height steps and/or surfaces spatially isolated from one another.
Journal ArticleDOI
Review of electronic speckle pattern interferometry (ESPI) for three dimensional displacement measurement
TL;DR: A review of the recent developments in ESPI systems for 3D displacement and strain measurement can be found in this article, where the basic theory, a brief derivation and different optical layouts are presented.
Journal ArticleDOI
Phase-shifting algorithms for electronic speckle pattern interferometry.
TL;DR: A set of innovative phase-shifting algorithms developed to facilitate metrology based on electronic speckle pattern interferometry (ESPI) are presented and shown to improve significantly the quality of the phase maps.
Journal ArticleDOI
Convenient method for calibrating nonlinear phase modulators for use in phase shifting interferometry
TL;DR: In this article, a method to calibrate a nonlinear phase modulator is proposed based on the minimization of a function obtained from a sequence of interferometric images. But this method is not applicable to smooth wavefront and speckled wavefront interferometry, allowing con- venient in situ calibration for a wide range of inter-ferometer configura- tions.