  Mid-air ultrasound haptic technology offers a myriad of temporal and spatial
parameters for contactless haptic design. Yet, predicting how these parameters
interact to render an ultrasound signal is difficult before testing them on a
mid-air ultrasound haptic device. Thus, haptic designers often use a
trial-and-error process with different parameter combinations to obtain desired
tactile patterns (i.e., Tactons) for user applications. We propose an
interactive tool with five temporal and three spatiotemporal design parameters
that can simulate the temporal and spectral properties of stimulation at
specific skin points. As a preliminary verification, we measured vibrations
induced from the ultrasound Tactons varying on one temporal and two
spatiotemporal parameters. The measurements and simulation showed similar
results for three different ultrasound rendering techniques, suggesting the
efficacy of the simulation tool. We present key insights from the simulation
and discuss future directions for enhancing the capabilities of simulations.
