The sound is, as the name implies, ultrasonic — so outside the range of human hearing — but strong enough so that the small, light objects can be positioned and held fixed in mid-air where ...

But a hackier way would be to build a parametric speaker that focuses soundwaves into a narrow beam like [Shane] did with this ultrasonic sound gun. As the directivity of a soundwave depends on ...

But when they intersect in space, nonlinear effects cause them to generate a new sound wave at an audible frequency that would be heard only in that specific region. Crucially, we designed ultrasonic ...

“Metasurfaces are engineered materials that manipulate wave behaviour in ways that natural materials cannot,” said Zhong. “In ...

Ultrasonic beams fired through a 3D-printed metasurface can create localized pockets of sound that are inaudible to ...

When the beams intersect, a phenomenon known as difference frequency generation occurs, creating an audible sound. "When two ultrasonic beams of slightly different frequencies, such as 40 kHz and ...

New research offering bendable sound waves that can reach only one set of ears could be the next tech revolution.

Improve Laboratory Efficiency with Our Ultrasonic Bath Sonicator for Precise Cleaning Efficiency and precision are two ...

Jia-Xin "Jay" Zhong, a postdoctoral scholar of acoustics at Penn State, used a dummy with microphones in its ears to measure the presence or absence of sound along an ultrasonic trajectory.

This causes the tissue to expand and contract, creating vibrations which can be picked up as ultrasonic sound waves by sensitive detectors. Different materials and molecules inside the tissue ...