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“This is the first experimental evidence that this is possible,
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,” says Bo Thidé,
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, a physicist at the Swedish Institute of Space Physics in Uppsala.

Lavery and his team then did a similar experiment with ordinary light to prove that,
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, even with waves twisting in all directions,
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, they could take advantage of the Doppler change in angular momentum to measure the speed of the disk’s rotation.

Engineers could exploit the technique to protect wind turbines, which can get damaged by violent,
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, swirling air currents. Lavery envisions a sensor on the nose of a turbine that would detect dangerous vortices and switch the turbine off.

Thidé says that weather radar could exploit the rotational Doppler effect to detect tornadoes before they reach the ground. Two years ago,
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, he proposed a similar method to detect the rotation rate of supermassive black holes like the one lurking at the center of our galaxy (SN: 3/12/11, p. 14). “This experiment tells the rest of the world that there’s a lot to be gained by using this technique,” he says. “It will push people to go ahead and start to build applications.”
Fri,
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