Investigating Freely Suspended Water-Drop Interactions with High-Speed Photography

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Publisher: SMPTE
Doc Type: Journal Article
Article Type: research-article
Abstract: Because direct photographing of the precipitation growth processes is thwarted by the scattered light of cloud droplets and the immense scale over which these processes occur, to obtain photographic evidence of precipitation growth, cloud conditions have been modeled in a laboratory. A large vertical wind tunnel has been used to support thousands of drops in an updraft. To optimize the conditions, a high-speed camera and a lens affording a high degree of variability were selected. To obtain a sharp boundary definition, drops were silhouetted against a frosted glass illuminated from behind with a medium floodlight. A very narrow spotlight was situated 100 degrees from the camera to illuminate the drops being photographed. Most events were filmed at approximately 2.5 m with either a 90, 100 or 120 mm lens at framing rates of 500 frames/s to 4000 frames/s depending on the requirements of the interactions.
Publication Date: 1971-07-01
DOI: 10.5594/J00824
Link: https://doi.org/10.5594/J00824
Author(s): John D. Spengler, Narayan R. Gokhale

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John D. Spengler and Narayan R. Gokhale; Investigating Freely Suspended Water-Drop Interactions with High-Speed Photography, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J00824

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John D. Spengler and Narayan R. Gokhale; Investigating Freely Suspended Water-Drop Interactions with High-Speed Photography, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971. Available at https://doi.org/10.5594/J00824

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<span class="citation">John D. Spengler and Narayan R. Gokhale; <cite>Investigating Freely Suspended Water-Drop Interactions with High-Speed Photography</cite>, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971. Available at <a href="https://doi.org/10.5594/J00824" target="_blank" rel="noopener">https://doi.org/10.5594/J00824</a></span>

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<li>
John D. Spengler and Narayan R. Gokhale; <cite id="bib-10-5594-j00824">Investigating Freely Suspended Water-Drop Interactions with High-Speed Photography</cite>, Journal of the SMPTE ( Volume: 80, Issue: 7, July 1971); SMPTE, 1971
<span class="doi">10.5594/J00824</span>
</li>