A tractor beam reels in objects with sound

Ultrasound machine pulls on a target that is large enough to see

By Andrew Grant, 15:16 PM March 17, 2014

Tractor beams have hit the big time. A newly constructed device generates a beam of concentrated sound that, for the first time, exerts a continuous, perceptible tug on objects large enough to see. The researchers didn’t actually reel in an object, but they demonstrated that an ultrasound tractor beam could do the job.

Using a tractor beam to haul a damaged spaceship may look simple on Star Trek, but nature makes it very difficult to pull objects from a distance. Waves of light or sound fired ...

Source URL: https://www.sciencenews.org/article/tractor-beam-reels-objects-sound