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Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Department of Mechanical Engineering, Örebro University, Örebro, Sweden.
2019 (English)In: International Journal of Optics, ISSN 1687-9384, E-ISSN 1687-9392, Vol. 2019, article id 4906109Article in journal (Refereed) Published
Abstract [en]

We present a digital holographic method to increase height range measurement with a reduced phase ambiguity using a dual-directional illumination. Small changes in the angle of incident illumination introduce phase differences between the recorded complex fields. We decrease relative phase difference between the recorded complex fields 279 and 139 times by changing the angle of incident 0.5° and 1°, respectively. A two cent Euro coin edge groove is used to measure the shape. The groove depth is measured as ≈300 μm  . Further, numerical refocusing and analysis of speckle displacements in two different planes are used to measure the depth without a use of phase unwrapping process.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2019. Vol. 2019, article id 4906109
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-72956DOI: 10.1155/2019/4906109ISI: 000459030200001Scopus ID: 2-s2.0-85062368196OAI: oai:DiVA.org:ltu-72956DiVA, id: diva2:1290282
Note

Validerad;2019;Nivå 2;2019-03-13 (johcin)

Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-03-13Bibliographically approved

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Khodadad, Davood

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