Скачать или смотреть Levitation objects using sound waves(details 👇)

Acoustic levitation uses high-intensity sound waves, typically ultrasound, to suspend small objects in mid-air by counteracting gravity. This phenomenon relies on acoustic radiation pressure from standing waves formed by interfering sound waves. Small objects like droplets, polystyrene beads, insects, or cells can be levitated and manipulated without physical contact.How It WorksSound waves create regions of high and low pressure; when reflected, they form standing waves with stable nodes where pressure traps objects. Arrays of transducers or speakers precisely control wave timing to surround the object with intense sound, pushing it back to the low-pressure center if it drifts. Ultrasonic frequencies (above 20 kHz) are common to avoid audible noise while generating sufficient force.Setup ExamplesSimple DIY: Two opposing transducers emit waves that reflect off a concave surface, forming levitation points for lightweight items like foam.Advanced Arrays: Phased loudspeaker arrays create movable focal points for 3D control, enabling object transport.Lab Devices: Cylindrical emitters produce standing waves strong enough for droplets or particles.Applications and LimitsResearchers use it for contactless manipulation in biology (e.g., cell studies) and materials science, avoiding contamination. Current limits include small object sizes (millimeters or less) due to power and frequency constraints; larger items require immense energy. Recent advances combine sound with electric fields for multi-particle control.