Despite significant advances in virtual reality technologies, including realistic graphics and sound, the reproduction of olfactory sensations in VR environments has remained insufficiently convincing.

History of Olfactory Technology Development

In 1939, the film Scent of Mystery was presented with the Smell-O-Vision system, which allowed viewers to experience scents synchronized with specific scenes. This was achieved using the Smell Brain machine, which operated on compressed air and was manually controlled. However, the device was noisy and distributed scents unevenly throughout the theater, leading to mixed audience reviews.

Later, devices designed for the gaming industry were also bulky and poorly integrated with portable VR systems.

Development of a Compact Wearable Device

A team of researchers from the Institute of Science Tokyo, Science Tokyo, and the Rakuten Institute of Technology developed a more compact wearable device compatible with modern VR systems. They managed to reduce the size of the control circuitry and improve the methods for delivering and controlling aromas. The new device can mix several scents in real time according to the displayed VR content. Up to eight different aromatic elements can be combined simultaneously in various proportions to create a wide range of smells.

Technological Features

The device uses a micro-doser that releases tiny droplets of liquid aroma, as well as ultrasonic waves to turn these droplets into a fine mist. An electroosmotic pump ensures precise control over aroma delivery, allowing for stable scent reproduction with minimal delay.

Application and Testing Results

The researchers created virtual tourism content using the new device, enabling users to visit various virtual locations and experience corresponding scents for a more immersive experience. Testing showed that adding scents made the virtual environment more realistic and enhanced the sense of presence in VR.

Publication of Results

An article about this technology was published in the IEEE Sensors Journal.