Methods for Measuring Sub-Surface Skin Displacement during Ultrasound Mid-Air Haptic Stimulation
Résumé
Ultrasound mid-air haptic interfaces allow for the rendering of tactile stimulation with no contact, through the constructive interference of phasecontrolled acoustic waves. In addition to the interesting potential it brings for rich and natural tactile stimulation, its large design space and noncontact nature stand out from most existing technologies. This means that UMH requires more in-depth understanding, especially of the skin mechanics in response to stimulation, and how it contributes to tactile perception. At the same time, the noncontact nature of UMH facilitates such study, as it can stimulate the skin from a distance, without occluding measurement tools. Here, we propose an original setup to measure the sub-surface displacement of the glabrous skin in response to a variety of UMH stimuli, using functional optical coherence tomography (fOCT). Such measures are necessary to understand how the skin reacts to the acoustic radiation of UMH, providing insights about the underlying perception of UMH stimuli. We present the first set of measurements combining UMH and fOCT with a data processing pipeline and preliminary discussion of early results demonstrating feasibility.
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