Researchers at the University of Aberdeen, Scotland discovered that bats tend to avoid radar installations. Although the exact method is not clear, it is possible that the radar somehow stimulates the bats' ears and creates a perception of unwanted noise.
"This was noticed when radar arrays first started up during World War II," Racey said. "A portion of radar operators said they heard clicks in their ears when they were switched on." Radar signals can lead to small but rapid spikes of heat in the head that generate sound waves, which in turn stimulate the ear. "A bat's hearing is much more sensitive than ours," Racey noted. "It may be so sensitive that even a tiny amount of sound caused by electromagnetic radiation is enough to drive them out of there."In tests, deploying a small radar unit in an area full of insects (tasty feeding ground for bats) showed a 30-40% decrease in bats in the area, although the insects were still there. The radar did not make the insects leave, but the bats stayed away. This could turn out to be a good deterrent to keep bats safely away from wind turbines, and help make wind power that much better.
written by Fred, July 27, 2009
written by BruceMcF, October 05, 2009
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