| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 14, Number 1, 2018
|
|
|---|---|---|
| Article Number | 5 | |
| Number of page(s) | 8 | |
| DOI | https://doi.org/10.1186/s41476-018-0073-0 | |
| Published online | 20 February 2018 | |
Research
Adaptive particle image velocimetry based on sharpness metrics
Technische Universität Dresden, Faculty of Electrical and Computer Engineering, Laboratory for Measurement and Sensor System Techniques, Helmholtzstrasse 18, 01062, Dresden, Germany
Received:
7
December
2017
Accepted:
7
February
2018
Background: Optical distortions can significantly deteriorate the measurement accuracy in particle image velocimetry systems. Such distortions can occur at fluctuating phase boundaries during flow measurement and result from the accompanied refractive index changes. The usage of a wavefront sensor can be hindered by disturbing light reflexes or scattering.
Methods: A combination of sharpness metric image evaluation and iterative optimization is demonstrated. The sharpness metric is used as an indicator for wavefront aberrations in order to correct low-order Zernike modes that influence the image quality of particle image velocimetry.
Results: In this work we outline a sharpness metric based aberration correction with a deformable mirror, applied for the first time to particle image velocimetry. The proposed method allows for the reduction of systematic measurement uncertainties in particle image velocimetry.
Conclusion: Our approach offers a new way to reduce static or slowly changing wavefront distortions in a fluid flow measurement setup in which a wavefront sensor is not applicable.
Key words: Particle image velocimetry / Wavefront aberrations / Sharpness metrics / Adaptive optics / Deformable mirror
© The Author(s) 2018
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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