Related Experiment Video
Updated: Sep 9, 2025
08:19
Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
2.3K
Dynamic caustics by ultrasonically modulated liquid surface
Koki Nagakura1, Tatsuki Fushimi2,3,4, Ayaka Tsutsui1
1Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, 305-8550, Japan.
Scientific Reports
|August 29, 2025
Summary
Researchers developed a new method for dynamic caustic patterns using dual-optimised holographic fields and Phased Array Transducers (PAT). This technique uses ultrasound to shape liquid surfaces, creating real-time, controllable caustic images with a Digital Twin framework.
Area of Science:
- Optics
- Acoustics
- Fluid Dynamics
- Computational Imaging
Background:
- Static caustic optimization and ultrasonic manipulation have been explored previously.
- Integrating liquid surfaces as refractive media for caustics has been simulated but not practically realized.
- Previous methods for dynamic caustics were limited in flexibility and real-time control.
Purpose of the Study:
- To present a novel method for generating dynamic caustic patterns using ultrasound.
- To demonstrate the practical application of liquid surfaces as dynamic refractive media for caustics.
- To leverage a Digital Twin framework for real-time feedback and optimization of caustic generation.
Main Methods:
- Utilisation of dual-optimised holographic fields with Phased Array Transducer (PAT).
- Employing computational techniques to dynamically shape fluid surfaces.
- Implementing a Digital Twin framework for iterative feedback and refinement.
Main Results:
- Successful generation of dynamic caustic patterns with controllable, real-time animations.
- Demonstrated high-frequency generation of complex caustic patterns using liquid surfaces.
- Achieved precise adjustments and optimization through the Digital Twin approach.
Conclusions:
- The presented method enables flexible, real-time generation of dynamic caustics using liquid surfaces.
- The Digital Twin framework enhances accuracy and quality of generated patterns.
- Potential applications include interactive displays, artistic installations, and educational tools, despite current limitations in contrast and resolution.
Keywords:
Acoustic holographyDigital twinDynamic causticsLiquid surface manipulationUltrasonic modulationMore Related Videos
Related Concept Videos
01:09Deriving the Speed of Sound in a Liquid
589
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
589
01:22Surface Tension of Fluid
481
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
481
01:04Hydrostatic Pressure Force on a Curved Surface
2.0K
Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
2.0K
01:07Damped Oscillations
6.0K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Although friction and other non-conservative...
6.0K
01:20Types of Damping
6.7K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
6.7K
01:28Standing Waves in a Cavity
1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K