According to Baidu Encyclopedia: "Acoustic radiation pressure is the reflection of sound waves propagating in a fluid medium, incident on an obstacle, the forward average pressure generated on it, the direction is the same as the direction of sound propagation. And the alternating sound pressure Differently, it is caused by the nonlinearity of the fluid medium. When the mathematical equation is used to describe the propagation law of sound waves in the fluid medium, it is often considered that the sound pressure is not large, so the second-order small quantity in the equation is omitted. A small amount constitutes the sound radiation pressure."
Acoustic radiation pressure is a tactile feedback system that interacts with sounds that are inaudible to the human ear (usually ultrasound). The acoustic radiation pressure can be made up of a loudspeaker that produces a specific sound wave that produces a difference in pressure density at a particular location. Simply put, ultrasonic waves undergo shape changes under pressure and simulate a fictitious shape and force, which is called acoustic radiation pressure. The acoustic radiation pressure is proportional to the acoustic energy density.
A good analogy is the laser/bubble technique (using lasers to make different bubble shapes on glass). The heat of a laser beam is not enough to affect the glass, but when the two beams intersect, their power will superimpose and affect the glass, creating a bubble pattern. The same is true for the crossed ultrasonic beams. After combining hand tracking techniques such as Intel RealSense, the acoustic radiation pressure beam creates some illusion of resistance or texture.
Acoustic radiation pressure (ARP) may be a major breakthrough in tactile feedback. Virtual reality applications can take advantage of the potential benefits of the system to provide a level of immersion that other haptic suits or controllers cannot achieve. This is a huge step towards a fully immersive VR.
This technology was first seen in Japan in 2009. A team of researchers at the University of Tokyo tested a new technology called "Airborne Ultrasound TacTIle Display" that uses ultrasound to produce a touchable hologram.
One of the researchers said: "Although we can 'see' holographic images, as if they are really floating in front of us, we can't 'touch' them because they are just light. The project is a suspension in 3D free space. The image adds tactile feedback. The sense of touch needs to be in contact with the object to form, but including a stimulator in the workspace will dilute the appearance of the holographic image. The suspended ultrasonic tactile display can create a tactile sensation on the user's hand, while not There will be any direct contact and will not dilute the quality of the holographic projection."
New technologies use ultrasound to transmit touch to the user. The user can feel the button without touching or gain tactile feedback when interacting with the virtual object. Yivian has repeatedly reported that UltrahapTIcs has developed an ultrasonic haptic technology that allows you to touch objects in midair without having to wear any equipment or touch anything.
Potential applications for acoustic radiation pressure are:
· Car: Gesture recognition control will help drivers get rid of the limitations of physical buttons and complex operator interfaces.
· Home appliances: Touch-free control will let you manage all kitchen appliances, control your refrigerator or lower the oven temperature by simply waving your hand, all without touching anything.
Game and Computing: The nature of humanity tells us that when children want something or want to explore, they will first reach out and try to touch and feel. Whether it's gaming, socializing, developing, watching adult entertainment videos or learning, in order to experience the full 3D world, we all need an immersive 3D feel.
Consumer Electronics: Connected homes need a connection interface. You can control lighting, TV, music, thermostats, etc. by waving your hand, or just by tapping in the air.
For infinitely available acoustic radiation pressure, this is only part of many potential applications. Especially in virtual reality, ultrasonic haptics can be an important subversive force. Imagine that the combination of this technology with VR games or the VR adult entertainment industry will greatly enhance its interactivity. We can't wait to see the future with this amazing new technology.
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