Phase retrieval in DSSI for relatively large deformation

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• 作者：H. Niu ; C. Quan ; C.J. Tay ; B. Bhaduri
• 关键词：Phase retrieval ; Digital speckle shearing interferometry (DSSI) ; Windowed Fourier filtering (WFF) ; Phase shifting
• 刊名：Optics Communications
• 出版年：2011
• 出版时间：1 January 2011
• 年：2011
• 卷：284
• 期：1
• 页码：118-122
• 全文大小：1263 K

文摘

Methods for phase retrieval in digital speckle shearing interferometry (DSSI) with relatively large deformation are proposed using a single wavelength illumination with windowed Fourier filtering (WFF) and two-wavelength simultaneous illumination with iterative sine–cosine average filtering (ISCAF). For relatively large deformation measurement, WFF technique has a higher noise suppression capability than ISCAF technique but requires careful selection of the processing parameters, while ISCAF is a simple filtering with less parameter setting. Both methods for phase retrieval are discussed. Experimental results show that both methods are capable of noise suppression in the phase retrieval for relatively large deformation.