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Acoustic levitation holds an object by exerting sound-driven forces on it—not by making it stick. When those forces balance the object’s weight and restore it toward a stable position after small movements, the object can remain suspended without contact or adhesive.
How sound can hold an object still
Sound is a pressure wave. When it interacts with an object, momentum is transferred between the sound field and the object, producing an average force called acoustic radiation force. A levitator arranges that force so it can oppose gravity and, near the desired position, resist small displacements.
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In a familiar airborne setup, an ultrasonic transducer sends sound toward a reflector. The outgoing and reflected waves overlap to create a standing wave: a pattern of pressure variation that stays in place. The resulting forces can support an object at a stable location. This is a force balance, not suction, magnetism, or an adhesive bond. The details depend on the object and the field, not simply on pressure alone. UCL’s explainer describes arrays that form “pressure cages” around objects; moving the field pattern can move the trapped object.
What determines the trapping position?
A pressure node is often used to explain standing-wave levitation, but it is not a universal destination for every object. Trapping depends on how the object scatters sound, its material and size, and the geometry of the field.
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For example, a 2022 Physical Review Applied study examined expanded-polystyrene particles in air in a 40 kHz standing wave. In the studied configuration, particles of some sizes trapped near pressure nodes, while others trapped off-axis near pressure antinodes. The result is specific to that experiment, but it shows why “all objects sit at a pressure node” is too broad a rule. The study’s abstract reports the size-dependent trapping behavior.
How levitators create and move a trap
Emitter and reflector
A basic standing-wave levitator uses an emitter and a reflector facing one another. Their waves establish a structured field in the space between them. The field’s forces can hold a suitable small object at an equilibrium position.
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- Desktop Soldering Practice Project: This ultrasonic Levitator Soldering Practice Kit allows you to build a standing wave generator which will give tiny objects the appearance of levitation, easily soldering and installing the parts to achieve this effect
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Phased or switched arrays
Arrays provide more control than a simple opposing pair: they can shape localized traps and move them through space. This makes it possible to manipulate small objects rather than merely suspend them in one fixed spot. UCL’s account of array-generated pressure cages explains this approach, though the actual force and stable working volume depend on the system’s design.
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There is no single size limit for all acoustic levitators. A review of airborne acoustic levitation says many standing-wave systems operate ultrasonically, typically around 20–100 kHz, and handle objects from hundreds of micrometres to a few millimetres. These are typical dimensions for common systems, not a hard boundary; specialized designs can work in other size ranges or provide more complex manipulation. The review discusses these approaches and their limitations.
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- Stable Levitation: Suspends foam balls consistently for 24 hours using ultrasonic standing wave technology with precise 50x40x28mm module
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- Easy to Use: No programming is required. This mini ultrasonic levitation module is already assembled and is mainly used by DIY enthusiasts to learn the ultrasonic standing wave levitation technology
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A notable exception appeared in a 2017 paper by Andrade, Okina, Bernassau, and Adamowski. Their purpose-built apparatus levitated a slightly curved object weighing 2.3 g, larger than the wavelength in air. It used two 25 kHz ultrasonic Langevin transducers connected to an aluminum plate. The described vertical radiation force countered gravity, while a lateral restoring force supported horizontal stability. This demonstrates what a specialized geometry can achieve; it does not mean an ordinary small levitator can lift arbitrary large objects. The PubMed record identifies the paper and its reported setup.
Where acoustic levitation is used—and what it does not imply
Research explores acoustic levitation for non-contact handling of particles, fluids, and samples, including three-dimensional manipulation. Keeping a sample off a surface may be useful when contact itself is undesirable, but the method’s suitability depends on the object, field, and application.
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- ✨ See Ultrasound in a Compact Device! Using the principle of 40 kHz ultrasonic standing waves, this compact device creates a stable acoustic field that levitates 2–3 mm foam balls effortlessly—not magic, but a tangible physical phenomenon. Bring the complexity of acoustics into a mini lab you build yourself! Note: A 12V DC power supply is required and not included.
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- 🛡️ Professional Support, Ready to Assist: Detailed English instructions with illustrations are provided. We recommend scanning the QR code on the main product image or downloading the digital manual from Amazon’s “Product Guides & Documentation” page before soldering. If you encounter issues such as cold solder joints, incorrectly installed components, or no levitation after powering on, please contact us promptly—our R&D engineers will provide targeted technical guidance to support your assembly process.
Near-field acoustic levitation is also studied as a possible non-contact bearing technology. A 2019 critical review discusses squeeze-film air bearings and engineering obstacles to wider use; this is a research and engineering direction, not evidence that ordinary acoustic levitation is a general-purpose replacement for adhesives or mechanical supports. The review covers the near-field bearing work.
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- 【Rocket Ultrasonic Levitation】: Features a rocket-shaped design with an ultrasonic levitation system based on standing-wave principles. The ultrasonic waves suspend lightweight balls in the air for hands-on exploration of ultrasonic levitation and basic physics concepts. The rocket shape also works as a desktop decoration after assembly.
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How to compare two levitation demonstrations
Different demonstrations can use different objects, fields, and goals, so compare their setups before comparing their results. Useful details include:
- Object: its mass, dimensions, shape, and material.
- Environment: whether it is levitated in air or liquid, or uses a near-field configuration.
- Field generator: whether the setup uses an emitter and reflector or a controllable array.
- Frequency and control: the operating frequency and whether the field is fixed or can be shaped and moved.
- Goal: simple suspension, translation or rotation, or bearing operation.
- Stability and working volume: how well the object stays in place and where the system can hold it.
For instance, the 40 kHz particle experiment and the 25 kHz, 2.3 g demonstration are not directly interchangeable measures of a general “lifting capacity”: they used different objects and apparatus for different experimental cases.
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