Mathematical design of a novel input/instruction device using a moving acoustic emitter. (20th September 2017)

• Record Type: Journal Article
• Authors: Wang, Xianchao; Guo, Yukun; Li, Jingzhi; Liu, Hongyu
• Is Part Of: Inverse problems. Volume 33:Number 10(2017:Oct.)
• Publication Date: 2017-09-20
• Subjects: input/instruction device -- acoustic wave -- inverse source problem -- moving source -- trajectory identification; Inverse problems (Differential equations) -- Periodicals; 515.357
• DOI: 10.1088/1361-6420/aa873f
• Languages: English
• ISSNs: 0266-5611

Abstract

Abstract: This paper is concerned with the mathematical design of a novel input/instruction device using a moving emitter. The emitter acts as a point source and can be installed on a digital pen or worn on the finger of the human being who desires to interact/communicate with the computer. The input/instruction can be recognized by identifying the moving trajectory of the emitter performed by the human being from the collected wave field data. The identification process is modelled as an inverse source problem where one intends to identify the trajectory of a moving point source. There are several salient features of our study which distinguish our result from the existing ones in the literature. First, the point source is moving in an inhomogeneous background medium, which models the human body. Second, the dynamical wave field data are collected in a limited aperture. Third, the reconstruction method is independent of the background medium, and it is totally direct without any matrix inversion. Hence, it is efficient and robust with respect to the measurement noise. Both theoretical justifications and computational experiments are presented to verify our novel findings.