Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement
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 differenc...
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| Format: | Article |
| Language: | English |
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Wiley
2019-01-01
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| Series: | International Journal of Optics |
| Online Access: | http://dx.doi.org/10.1155/2019/4906109 |
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| _version_ | 1849402620911812608 |
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| author | Davood Khodadad |
| author_facet | Davood Khodadad |
| author_sort | Davood Khodadad |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-96769d83a6a54929a30d26e9c35cbff0 |
| institution | Kabale University |
| issn | 1687-9384 1687-9392 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Optics |
| spelling | doaj-art-96769d83a6a54929a30d26e9c35cbff02025-08-20T03:37:30ZengWileyInternational Journal of Optics1687-93841687-93922019-01-01201910.1155/2019/49061094906109Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape MeasurementDavood Khodadad0Department of Mechanical Engineering, Örebro University, SE-701 82 Örebro, SwedenWe 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.http://dx.doi.org/10.1155/2019/4906109 |
| spellingShingle | Davood Khodadad Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement International Journal of Optics |
| title | Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement |
| title_full | Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement |
| title_fullStr | Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement |
| title_full_unstemmed | Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement |
| title_short | Combined Reduced Phase Dual-Directional Illumination Digital Holography and Speckle Displacements for Shape Measurement |
| title_sort | combined reduced phase dual directional illumination digital holography and speckle displacements for shape measurement |
| url | http://dx.doi.org/10.1155/2019/4906109 |
| work_keys_str_mv | AT davoodkhodadad combinedreducedphasedualdirectionalilluminationdigitalholographyandspeckledisplacementsforshapemeasurement |