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Spray drop measurements using depth from defocus

Zhou, Wu ; Tropea, Cameron ; Chen, Benting ; Zhang, Yukun ; Luo, Xu ; Cai, Xiaoshu (2021):
Spray drop measurements using depth from defocus. (Publisher's Version)
In: Measurement Science and Technology, 31 (7), IOP Publishing, ISSN 0957-0233, e-ISSN 1361-6501,
DOI: 10.26083/tuprints-00019333,
[Article]

Abstract

Sprays are typically characterised by providing local drop size and velocity distributions and number density. The present work examines the possibility of obtaining such information using backlight photography, whereby two cameras are employed and the size and position of each imaged drop is obtained using a depth from defocus approach. A simple algorithm for estimating size and position from the two camera images is introduced and the sensitivity of this algorithm to various system parameters is investigated with simulations using synthetic images, measurements from a calibration facility, and measurements conducted in a sparse spray. Comparison measurements using the analysis of focused images are provided.

Item Type: Article
Erschienen: 2021
Creators: Zhou, Wu ; Tropea, Cameron ; Chen, Benting ; Zhang, Yukun ; Luo, Xu ; Cai, Xiaoshu
Origin: Secondary publication via sponsored Golden Open Access
Status: Publisher's Version
Title: Spray drop measurements using depth from defocus
Language: English
Abstract:

Sprays are typically characterised by providing local drop size and velocity distributions and number density. The present work examines the possibility of obtaining such information using backlight photography, whereby two cameras are employed and the size and position of each imaged drop is obtained using a depth from defocus approach. A simple algorithm for estimating size and position from the two camera images is introduced and the sensitivity of this algorithm to various system parameters is investigated with simulations using synthetic images, measurements from a calibration facility, and measurements conducted in a sparse spray. Comparison measurements using the analysis of focused images are provided.

Journal or Publication Title: Measurement Science and Technology
Journal volume: 31
Number: 7
Publisher: IOP Publishing
Collation: 10 Seiten
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA)
Date Deposited: 24 Aug 2021 07:13
DOI: 10.26083/tuprints-00019333
Official URL: https://tuprints.ulb.tu-darmstadt.de/19333
URN: urn:nbn:de:tuda-tuprints-193333
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