Friday, July 31, 2015

Project aims to video snowflake

OTTAWA—This is one flaky project.
Just in time for winter, the federal government is launching a science project to capture images of the elusive falling snowflake.

Environment Canada wants to buy an extremely fast camera that can take detailed videos of snowflakes as they float to earth.
The resulting slow-motion images will show how snowflakes evolve as they descend and that information will be used to make devices that measure snowfall amounts more accurate.
An industry notice yesterday said the project will be carried out at a federal weather research facility north of Toronto.
The new camera must be delivered by mid-December to Environment Canada’s King City, Ont. radar station, in time for the snow season.
The video images would slow “the movement of snowflakes and eliminate the motion blur, making it possible to track air flow, velocity, acceleration, as well as flake size and shape change in some instances,” said the notice.
A spokesman for Environment Canada said the snowflake video-recording will take place at the Centre for Atmospheric Research Experiments, a federal research station in Egbert, Ont., a rural, forested area about 80 kilometres north of Toronto.
Mark Johnson declined to comment on the estimated cost of the snowflake project or video equipment.
“Photos of falling snowflakes will be taken at 2,000 to 3,000 frames per second and used to determine their trajectory in windy and turbulent conditions,” Johnson said in an e-mail.
“This is to determine which flakes and what size of flakes will be caught by, or deflected around, different sorts of snow gauges,” he noted.
“Then we can determine which gauges are effective in measuring falling snow.”

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