Articles | Volume 18, issue 21
https://doi.org/10.5194/amt-18-6291-2025
https://doi.org/10.5194/amt-18-6291-2025
Research article
 | 
06 Nov 2025
Research article |  | 06 Nov 2025

In-line holographic droplet imaging: accelerated classification with convolutional neural networks and quantitative experimental validation

Birte Thiede, Oliver Schlenczek, Katja Stieger, Alexander Ecker, Eberhard Bodenschatz, and Gholamhossein Bagheri

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Cited articles

Allwayin, N., Larsen, M. L., Glienke, S., and Shaw, R. A.: Locally narrow droplet size distributions are ubiquitous in stratocumulus clouds, Science, 384, 528–532, 2024. a
Amsler, P.: Digital in-line holographic microscope for ice crystals, PhD thesis, ETH Zurich, https://doi.org/10.3929/ethz-a-005900340, 2009. a
Bagheri, G., Schlenczek, O., Turco, L., Thiede, B., Stieger, K., Kosub, J. M., Clauberg, S., Pöhlker, M. L., Pöhlker, C., Moláček, J., Scheithauer, S., and Bodenschatz, E: Size, concentration, and origin of human exhaled particles and their dependence on human factors with implications on infection transmission, Journal of Aerosol Science, 168, 106102, https://doi.org/10.1016/j.jaerosci.2022.106102, 2023. a
Beals, M. A., Fugal, J. P., Shaw, R. A., Lu, J., Spuler, S. M., and Stith, J. L.: Holographic measurements of inhomogeneous cloud mixing at the centimeter scale, Science, 350, 87–90, 2015. a
Beals, M. J.: Investigations of cloud microphysical response to mixing using digital holography, PhD thesis, Michigan Technological University, https://doi.org/10.37099/mtu.dc.etds/669, 2013. a
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Short summary
Accurate measurement of cloud particles is crucial for cloud research. While holographic imaging enables detailed analysis of cloud droplet size, shape, and distribution, processing errors remain poorly quantified. To address this, we developed CloudTarget, a patterned photomask that can quantify the detection efficiency and uncertainties. Additionally, our AI-based classification enhances both accuracy and speed, achieving over 90 % precision while accelerating analysis 100-fold.
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