Dr. Yuanhao Huang Profile

Dr. Yuanhao Huang

at SMART-Singapore

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Proceedings Article | 25 August 2009 Paper

Clustering approach for phase extraction from one single fringe pattern in shearography

Y. Huang, L. Liu, S. Ng, Y. Chen, Y. Hung

Proceedings Volume 7375, 737548 (2009) https://doi.org/10.1117/12.839283

KEYWORDS: Fringe analysis, Shearography, Phase shifting, Phase shifts, Phase measurement, Fourier transforms, Speckle, Bismuth, Phase retrieval, Speckle pattern

Read Abstract +

In the field of optical measurement, phase always represents the physical quantity to be measured. Thus phase extraction from fringe pattern is a key step for quantitative measurement and evaluation. Much research work has been conducted to develop effective phase evaluation methods such as fringe tracking and fringe skeleton in early years, and the more precise method of phase shifting and Fourier transform techniques in recent decades. For accurate phase evaluation, phase shifting method requires three or more phase-shifted fringe patterns at each deformed stage, thus it is not suitable for continuous deformation measurement. Fourier transform, on the other hand, requires a high frequency carrier fringe for phase separation in the spectrum domain, which places stringent requirement on experiment arrangement. Thus it would be desirable to develop a convenient method to retrieve the modulated phase from a single fringe pattern. In this paper, we propose a clustering approach which utilizes the phase clustering property to extract phase information from a single interference specklegram. To explore the workability and limitations of the proposed technique, typical shearographic fringe patterns are used for phase evaluation. Results obtained are similar to those from standard 4-step phase-shifting method with similar accuracy. Non-repeatable continuous movement is also measured by the proposed method, and the results confirm the robustness and accuracy of the proposed clustering phase extraction method.

SPIE Journal Paper | 1 May 2008

Shearographic phase retrieval using one single specklegram: a clustering approach

Y. Huang, Siu Pang Ng, Long Liu, Y. Chen, Y.Y. Hung

OE, Vol. 47, Issue 05, 054301, (May 2008) https://doi.org/10.1117/12.10.1117/1.2927462

KEYWORDS: Phase retrieval, Phase shifts, Fringe analysis, Shearography, Speckle pattern, Optical engineering, Fourier transforms, Phase measurement, Modulation, Phase shifting

Read Abstract +

In the field of optical measurement, phase always represents the physical quantity to be measured. Thus, phase retrieval from a fringe pattern is a key step for quantitative measurement and evaluation. Much research work has been conducted to develop phase evaluation methods such as fringe tracking and fringe skeletons in earlier, and the more precise methods of phase-shifting and Fourier transform more recently. For phase evaluation, the phase-shifting method requires three or more phase-shifted speckle patterns at each deformed stage; thus, it is not suitable for measurement of continuous deformation. The Fourier transform, on the other hand, requires a high-frequency carrier for phase separation in the spectral domain, which places an additional requirement on experimental arrangement. Thus, it would be desirable to develop a convenient method that can retrieve the modulated phase from a single fringe pattern. We propose an approach that utilizes the phase-clustering property to extract phase information from a single interference specklegram. To explore the ability and limitation for the proposed technique, typical shearographic fringe patterns are used for phase evaluation. Results obtained are similar to those from the standard four-step phase-shifting method. Nonrepeatable continuous movement is also measured by the proposed method, and the results confirm the robustness and accuracy of the clustering method.

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