Scientists introduced a device that creates holograms using ultrasound & polystyrene ball

Researchers at the University of Sussex in the UK have introduced technology that can create holograms using ultrasound and a 2mm polystyrene ball. They can move and interact with the observer.


Scientists called the new technology "multimodal acoustic trap display" (multimodal acoustic trap display, or MATD). Images are created between two horizontal plates on which many tiny ultrasound speakers are mounted. They create an inaudible sound field in which there is a "pocket" of low pressure, where a polystyrene ball enters. By moving the "pocket", you can move the ball, forming an image. Colors are added to the image using the projector.
Through careful monitoring of the ultrasound field, scientists can add sound effects and music to animated images. Vibrations can be adjusted to receive sound waves in the entire range of human hearing and, for example, to imitate clear speech. In addition, you can interact with images and even feel them in your own hands.



The…

Scientists have developed artificial skin to help restore touch

Along with hearing and sight, touch is one of the key ways to obtain information and interact with the world around you. And for people who, for some reason, have lost the ability to perceive tactilely, the researchers proposed artificial skin technology with the possibility of touch-sensitive feedback, reports the American Association for the Advancement of Science.

Scientists at the EPFL Reconfigurable Robotics Laboratory (RRL), led by Jamie Pike, and the School of Engineering's Soft Bioelectronic Interface (LSBI) laboratory, led by Stephanie Lacour, have proposed a system that combines soft silicone elements with soft sensors and actuators.

Silicone allows you to create the most appropriate form of body parts coating, and multi-layer coating provides signal reception and feedback. 


Artificial Skin That Senses Touch
Artificial Skin That Senses Touch 

The sensor layer is located on top of the membrane layer made of pneumatic elements and contains soft electrodes made of a mixture of liquid and solid gallium. 

These electrodes continuously measure the deformation of the skin and send the data to a microcontroller that uses this feedback to fine-tune the sensation transmitted to the person in response to their movements and changes of external factors.

Sensors continuously measure the deformation of artificial skin, so that sensory feedback can be adjusted in real time to create the most realistic sense of touch. 

Artificial skin can stretch up to four times its original size and withstand up to a million stretch-compression cycles without change.

The results of the research are published in Soft Robotics. In the near future, comprehensive development testing will begin in both real and virtual environments.

Reference:

  1. Harshal A. Sonar, Aaron P. Gerratt, Stéphanie P. Lacour, and Jamie Paik.Soft Robotics. http://doi.org/10.1089/soro.2019.0013September 23, 2019.

Related keywords:

  1. wearable technology
  2. tactile feedback device
  3. liquid metal sensor
  4. strain sensor
  5. soft pneumatic actuators
  6. haptic device

Self-Sensing Soft Pneumatic Actuator Skin

For the first time a closed loop tactile feedback control is achieved, it is the first time on a completely soft platform. A prototype of the new Self Sufficient Pneumatic Actuator (SPA) with soft load cells, called SPA skin, has been developed to withstand high multi-axis stresses and is capable of high-frequency sensing and control. 

To control tactile feedback in a closed loop, the platform requires a coherently integrated system. Comprised of a stretchable low-profile SPA (<500 µm) and an ultra-compatible thin-metal film strain gauge, this system creates a completely new double-sided platform for tactile sensing using adjustable vibration feedback force. 

By using this prototype, for example, real-time control of drive geometry up to 100 Hz with output forces up to 1 N supported by variable mechanical loads. 

The SPA leather platform was also described as a platform for static and dynamic behavior in the amplitude and frequency range, with an analytical model of the system to predict the actuator's pumping status using only the built-in sensor resistance. 

As a multi-layered system, the SPA skin can be easily implemented as a fast, wear-resistant bi-directional interface for contact and vibration-tax feedback.

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