Observations of airflow arising from Airborne Ultrasound Tactile Display

The airflow that accompanies the tactile sensation provided by the Airborne Ultrasound Tactile Display is investigated. Due to it, some people report that they feel something like airflow although the display generates steady pressure in midair. There are two possible areas where it arises: The surface of the skin or the pathway along the ultrasound beam. In this paper, two experiments are conducted to observe the phenomenon arises around the ultrasound beam. The airflow is visualized by smoke and its spatial distribution is measured with a pressure sensor. As far as the results, the latter hypothesis is supported.