Aberration compensation of holographic particle images using digital holographic microscopy
Characterisation of small and large-scale vortices in turbulent flows demands a system with high spatial resolution. The measurement of high spatial resolution, three-dimensional vector displacements in fluid mechanics using holography, is usually hampered by aberration. Aberration poses some prob...
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| Main Authors: | , , |
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| Format: | E-Article |
| Language: | English |
| Published: |
Taylor & Francis Ltd
2015
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/17769/1/Aberration%20compensation%20of%20holographic%20particle%20%28abstract%29.pdf http://ir.unimas.my/id/eprint/17769/ https://www.researchgate.net/publication/273338756 |
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| Summary: | Characterisation of small and large-scale vortices in turbulent flows demands a system with high spatial resolution. The
measurement of high spatial resolution, three-dimensional vector displacements in fluid mechanics using holography, is
usually hampered by aberration. Aberration poses some problems in particle image identification due to low fidelity of
real image reconstruction. Phase mismatch between the recording and the reconstruction waves was identified as the
main source of aberration in this study. This paper demonstrates how aberration compensation can be achieved by
cross-correlating the complex amplitude of an aberrated reconstructed object with the phase conjugate of a known
reference object in the plane of the hologram (frequency space). Results favourably show significant increase in Strehl
ratio and suppression of background noise that are more pronounced for particle images of 10 and 5 microns. It is clear
from the work conducted that wavefront aberration measurement and compensation of holographic microscopic objects
are now possible with the use of a variant digital holographic microscope |
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