Shape Measurement Based on Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements

We present a dual-directional illumination digital holographic method to increase height range measurement with a reduced phase ambiguity. Small change in the illumination angle of incident introduce phase difference between the recorded complex fields. We decrease relative phase difference between...

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Bibliographic Details
Published in2018 Progress in Electromagnetics Research Symposium (PIERS Toyama) pp. 184 - 189
Main Authors Khodadad, Davood, Tayebi, Behnam
Format Conference Proceeding
LanguageEnglish
Published The Institute of Electronics, Information and Communication Engineers (IEICE) 01.08.2018
SeriesProgress in Electromagnetics Research Symposium
Subjects
Electrotechnology
Elektroteknik alt Electrical engineering
Holography
Lighting
Phase measurement
Shape
Shape measurement
Speckle
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Summary:We present a dual-directional illumination digital holographic method to increase height range measurement with a reduced phase ambiguity. Small change in the illumination angle of incident introduce phase difference between the recorded complex fields. We decrease relative phase difference between the recorded complex field 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 \approx 300\mu \mathrm{m} . Further, numerical re-focusing and analysis of speckle displacements in two different planes are used to measure the depth without a use of phase unwrapping process.
ISBN:9781538654552
1538654555
4885523168
9784885523168
ISSN:1559-9450
DOI:10.23919/PIERS.2018.8597821