Print Email Facebook Twitter Peak-locking error reduction by birefringent optical diffusers Title Peak-locking error reduction by birefringent optical diffusers Author Kislaya, A. (TU Delft Fluid Mechanics) Sciacchitano, A. (TU Delft Aerodynamics) Date 2018 Abstract The use of optical diffusers for the reduction of peak-locking errors in particle image velocimetry is investigated. The working principle of the optical diffusers is based on the concept of birefringence, where the incoming rays are subject to different deflections depending on the light direction and polarization. The performances of the diffusers are assessed via wind tunnel measurements in uniform flow and wall-bounded turbulence. Comparison with best-practice image defocusing is also conducted. It is found that the optical diffusers yield an increase of the particle image diameter up to 10m in the sensor plane. Comparison with reference measurements showed a reduction of both random and systematic errors by a factor of 3, even at low imaging signal-to-noise ratio. Subject birefringenceoptical diffusersparticle image velocimetrypeak lockingrandom and bias errors, image defocussing To reference this document use: http://resolver.tudelft.nl/uuid:2ca6698a-e2af-4813-8f2b-2ca7fc9c050a DOI https://doi.org/10.1088/1361-6501/aa97f7 Embargo date 2021-06-11 ISSN 0957-0233 Source Measurement Science and Technology, 29 (2) Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 A. Kislaya, A. Sciacchitano Files PDF Kislaya_2018_Meas._Sci._T ... 025202.pdf 2.34 MB Close viewer /islandora/object/uuid:2ca6698a-e2af-4813-8f2b-2ca7fc9c050a/datastream/OBJ/view