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High-Speed Accelerometry of Atomizing Sprays using the FRAME concept

Kornienko, Vassily LU ; Andersson, David LU ; Ek, Simon LU ; Stiti, Mehdi LU ; Ravelid, Jonas LU ; Ehn, Andreas LU ; Berrocal, Edouard LU and Kristensson, Elias LU (2025) ILASS-Europe 2025
Abstract
Capturing fast transient spray phenomena, such as droplet breakup and secondary atomization, requires both high temporal and spatial resolution over extended durations, which is difficult to achieve with existing imaging methods. Burst imaging on one hand offers ultra-high frame rates but for short windows in time, while conventional high-speed cameras extend duration but are currently unable to track sub- microsecond events. Thus, these technologies either miss the atomization dynamics or the long-term effects of these dynamics. In this work, we demonstrate high-speed droplet accelerometry in an atomizing spray using an image multiplexing technique known as FRAME (Frequency Recognition Algorithm for Multiple Exposures). The FRAME method... (More)
Capturing fast transient spray phenomena, such as droplet breakup and secondary atomization, requires both high temporal and spatial resolution over extended durations, which is difficult to achieve with existing imaging methods. Burst imaging on one hand offers ultra-high frame rates but for short windows in time, while conventional high-speed cameras extend duration but are currently unable to track sub- microsecond events. Thus, these technologies either miss the atomization dynamics or the long-term effects of these dynamics. In this work, we demonstrate high-speed droplet accelerometry in an atomizing spray using an image multiplexing technique known as FRAME (Frequency Recognition Algorithm for Multiple Exposures). The FRAME method illuminates the sample with a burst of three laser pulses, each imprinted with a unique coded intensity profile. This coding enables the pulse intervals to be shorter than the inter-frame period of a high-speed camera, yielding a single multi-exposed image that captures information from all three illumination events. Fourier analysis is then applied during post-processing to separate and temporally arrange the individual images based on their coded structures. In our study, we combine a high-speed camera operating at ~20 kHz with FRAME image multiplexing to track small-scale motion at MHz acquisition rates over an entire injection event. This approach allows us to measure the acceleration of droplets in an atomizing spray in 2D at the frame rate set by the camera and to observe the forces acting on the liquid during breakup. (Less)
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organization
publishing date
type
Contribution to conference
publication status
published
subject
pages
9 pages
conference name
ILASS-Europe 2025
conference location
Lund, Sweden
conference dates
2025-08-31 - 2025-09-04
language
English
LU publication?
yes
id
9ce27f61-f556-42ec-9946-b7a200ee1833
alternative location
https://lu.app.box.com/s/sf6tig9q01y22t25mu1wz9v1l5arxdd9
date added to LUP
2026-03-09 16:36:22
date last changed
2026-03-10 14:18:27
@misc{9ce27f61-f556-42ec-9946-b7a200ee1833,
  abstract     = {{Capturing fast transient spray phenomena, such as droplet breakup and secondary atomization, requires both high temporal and spatial resolution over extended durations, which is difficult to achieve with existing imaging methods. Burst imaging on one hand offers ultra-high frame rates but for short windows in time, while conventional high-speed cameras extend duration but are currently unable to track sub- microsecond events. Thus, these technologies either miss the atomization dynamics or the long-term effects of these dynamics. In this work, we demonstrate high-speed droplet accelerometry in an atomizing spray using an image multiplexing technique known as FRAME (Frequency Recognition Algorithm for Multiple Exposures). The FRAME method illuminates the sample with a burst of three laser pulses, each imprinted with a unique coded intensity profile. This coding enables the pulse intervals to be shorter than the inter-frame period of a high-speed camera, yielding a single multi-exposed image that captures information from all three illumination events. Fourier analysis is then applied during post-processing to separate and temporally arrange the individual images based on their coded structures. In our study, we combine a high-speed camera operating at ~20 kHz with FRAME image multiplexing to track small-scale motion at MHz acquisition rates over an entire injection event. This approach allows us to measure the acceleration of droplets in an atomizing spray in 2D at the frame rate set by the camera and to observe the forces acting on the liquid during breakup.}},
  author       = {{Kornienko, Vassily and Andersson, David and Ek, Simon and Stiti, Mehdi and Ravelid, Jonas and Ehn, Andreas and Berrocal, Edouard and Kristensson, Elias}},
  language     = {{eng}},
  month        = {{08}},
  title        = {{High-Speed Accelerometry of Atomizing Sprays using the FRAME concept}},
  url          = {{https://lu.app.box.com/s/sf6tig9q01y22t25mu1wz9v1l5arxdd9}},
  year         = {{2025}},
}