What Is a Touchable Hologram?

In the description of the journal "ACM Transactions on Graphics", this technology using ultrasonic waves is named acoustic radiation force, which originates from the dispersion and absorption of sound waves. By observing the behavior of sound waves after striking an object, the shape of the object can be inferred. The research team also realized that we could touch these shapes by bringing the complex patterns of ultrasound into our hands. To this end, the researchers used air perturbations to create 3D suspended shapes that could be seen and the flesh could touch. The ultrasonic pattern itself is invisible to the naked eye, and the team also understands this. They aimed the device at a layer of grease, so that the depressions of the 3D suspended shape surface would appear spots under light. [1]

3D holographic touch map

Right!
In the description of the journal "ACM Transactions on Graphics", this technology using ultrasonic waves is named acoustic radiation force, which originates from the dispersion and absorption of sound waves. By observing the behavior of sound waves after striking an object, the shape of the object can be inferred. The research team also realized that we could touch these shapes by bringing the complex patterns of ultrasound into our hands. To this end, the researchers used air perturbations to create 3D suspended shapes that could be seen and the flesh could touch. The ultrasonic pattern itself is invisible to the naked eye, and the team also understands this. They aimed the device at a layer of grease, so that the depressions of the 3D suspended shape surface would appear spots under light. [1]

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