Academic Journal
Digital speckle pattern interferometry using spatial phase shifting: influence of intensity and phase gradients.
| Title: | Digital speckle pattern interferometry using spatial phase shifting: influence of intensity and phase gradients. |
|---|---|
| Authors: | Bhaduri, Basanta1 basanta@physics.iitm.ac.in, Mohan, N. Krishna1, Kothiyal, M. P.1 |
| Source: | Journal of Modern Optics. Mar2008, Vol. 55 Issue 6, p861-876. 16p. 2 Black and White Photographs, 1 Diagram, 8 Graphs. |
| Subject Terms: | Speckle interference, Space interferometry, Phase modulation, Holes, Light scattering |
| Abstract: | Spatial phase shifting technique in digital speckle pattern interferometry (DSPI) and digital shearography (DS) provides the phase information due to the object displacement from two images, one stored before and other after loading. The technique needs a carrier fringe system. The double aperture mask in front of the imaging system is one of the methods for introducing the spatial carrier frequency for phase evaluation. The size of the apertures and their separation are important criteria to obtain appropriate phase shift/column within the desired size of the speckle for phase retrieval. The assumptions of constant intensity and phase on adjacent pixels of the camera while calculating phase in spatial phase shifting (SPS) are not met as the speckled object wave contains intensity and phase gradients, resulting in distortions in the calculated phase profiles. In this paper we discuss a strategy to overcome these problems. The contrast of the correlation fringe obtained using this approach is much improved. It also eliminates the distortion in the unwrapped phase map like wave ripples. The experimental results on an edge clamped circular plate loaded at the center are presented. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: Digital speckle pattern interferometry using spatial phase shifting: influence of intensity and phase gradients. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bhaduri%2C+Basanta%22">Bhaduri, Basanta</searchLink><relatesTo>1</relatesTo><i> basanta@physics.iitm.ac.in</i><br /><searchLink fieldCode="AR" term="%22Mohan%2C+N%2E+Krishna%22">Mohan, N. Krishna</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kothiyal%2C+M%2E+P%2E%22">Kothiyal, M. P.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Modern+Optics%22">Journal of Modern Optics</searchLink>. Mar2008, Vol. 55 Issue 6, p861-876. 16p. 2 Black and White Photographs, 1 Diagram, 8 Graphs. – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Speckle+interference%22">Speckle interference</searchLink><br /><searchLink fieldCode="DE" term="%22Space+interferometry%22">Space interferometry</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+modulation%22">Phase modulation</searchLink><br /><searchLink fieldCode="DE" term="%22Holes%22">Holes</searchLink><br /><searchLink fieldCode="DE" term="%22Light+scattering%22">Light scattering</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Spatial phase shifting technique in digital speckle pattern interferometry (DSPI) and digital shearography (DS) provides the phase information due to the object displacement from two images, one stored before and other after loading. The technique needs a carrier fringe system. The double aperture mask in front of the imaging system is one of the methods for introducing the spatial carrier frequency for phase evaluation. The size of the apertures and their separation are important criteria to obtain appropriate phase shift/column within the desired size of the speckle for phase retrieval. The assumptions of constant intensity and phase on adjacent pixels of the camera while calculating phase in spatial phase shifting (SPS) are not met as the speckled object wave contains intensity and phase gradients, resulting in distortions in the calculated phase profiles. In this paper we discuss a strategy to overcome these problems. The contrast of the correlation fringe obtained using this approach is much improved. It also eliminates the distortion in the unwrapped phase map like wave ripples. The experimental results on an edge clamped circular plate loaded at the center are presented. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Modern Optics is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/09500340701504306 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 16 StartPage: 861 Subjects: – SubjectFull: Speckle interference Type: general – SubjectFull: Space interferometry Type: general – SubjectFull: Phase modulation Type: general – SubjectFull: Holes Type: general – SubjectFull: Light scattering Type: general Titles: – TitleFull: Digital speckle pattern interferometry using spatial phase shifting: influence of intensity and phase gradients. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bhaduri, Basanta – PersonEntity: Name: NameFull: Mohan, N. Krishna – PersonEntity: Name: NameFull: Kothiyal, M. P. IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 03 Text: Mar2008 Type: published Y: 2008 Identifiers: – Type: issn-print Value: 09500340 Numbering: – Type: volume Value: 55 – Type: issue Value: 6 Titles: – TitleFull: Journal of Modern Optics Type: main |
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