Date

2017

Document Type

Thesis

Degree

Master of Science

Department

Electrical Engineering

First Adviser

Hatalis, Miltiadis K.

Abstract

As the virtual and augmented reality industry continues to grow, it is important to develop a tactile display technology that can seamlessly integrate into a multimodal VR experience. Ultrasonic haptic display technology uses a phased array of ultrasound transducers to create a mid-air pressure focal point, and a modulation of this radiation field at a frequency around 100-300 Hz can stimulate the mechanoreceptors in the skin to produce a tactile sensation. Optimizing this technology to create a strong pressure intensity and focality at low cost and in small space can help open up a new commercial market for tactile displays.This study explores the creation of a simple and modularized pressure field simulator for ultrasonic haptic displays using a simplified model of transducer radiation pattern. The radiation behavior is broken down to a combination of an on-axis radiation behavior and a directivity behavior, each modeled by an exponential and a Gaussian function, respectively. Then, some physical characteristics of phased array are examined to evaluate their influence on peak intensity of focal peak, focal radius, and number of significant secondary focal peaks. The results of the simulator are then compared against the real pressure field of a haptic display prototype.

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