Cameras Capture Falling Snowflakes in 3D

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Three high-speed cameras triggered by infrared sensors to shoot flakes as quickly as 1/25000 of a second.
University of Utah

A gadget that can snap photos of individual snowflakes in freefall could lead to more accurate weather predictions.

Researchers at the University of Utah have developed the Multi Angle Snowflake Camera (MASC), which uses three high-speed cameras triggered by infrared sensors to shoot flakes as they float to the ground, with exposures as quick as 1/25000 of a second. The device also measures the flakes' fall speed, all without touching them, which would disturb the measurements.

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"You've probably seen gorgeous pictures of snowflakes that have been collected on glass slides and put under a microscope. These pictures, while beautiful, are pictures of snowflakes that are exceedingly rare,” said University of Utah atmospheric scientist Tim Garrett. Most snowflakes in nature are complex clumps of many flakes stuck to each other; putting one of those on a slide to photograph would destroy it.

The images could be used to better understand snowfall and create a more accurate model of winter storms. One of the things weather simulations are not currently good at is predicting snowfall accurately. "The reason they do so badly is because they don't represent snowflakes very well, because they are based on measurements of snowflakes that were done, painstakingly, by hand in the 1970s,” Garrett explained. “They were able to collect maybe a few thousand snowflakes. I knew the guy who did it and he felt he needed to get glasses because of this project."

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