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Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement
Örebro universitet, Institutionen för naturvetenskap och teknik. Experimental Mechanics, Luleå University of Technology, Luleå, Sweden.ORCID-id: 0000-0003-2960-3094
2019 (engelsk)Inngår i: International Journal of Optics, ISSN 1687-9384, E-ISSN 1687-9392, Vol. 2019, artikkel-id 4906109Artikkel i tidsskrift (Fagfellevurdert) 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  . 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.

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Hindawi Limited , 2019. Vol. 2019, artikkel-id 4906109
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URN: urn:nbn:se:oru:diva-72613DOI: 10.1155/2019/4906109ISI: 000459030200001Scopus ID: 2-s2.0-85062368196OAI: oai:DiVA.org:oru-72613DiVA, id: diva2:1290091
Tilgjengelig fra: 2019-02-19 Laget: 2019-02-19 Sist oppdatert: 2023-12-08bibliografisk kontrollert

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