@article {Park:2023:0736-2935:4239, title = "Movement tracking using asymmetric impedance meta-surface based on Helmholtz resonator", journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings", parent_itemid = "infobike://ince/incecp", publishercode ="ince", year = "2023", volume = "268", number = "4", publication date ="2023-11-30T00:00:00", pages = "4239-4244", itemtype = "ARTICLE", issn = "0736-2935", url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2023/00000268/00000004/art00028", doi = "doi:10.3397/IN_2023_0599", author = "Park, Jaehyeon and Kim, Jedo", abstract = "Acoustic sensors are one of the most commonly used sensors for detecting obstacles in mobile robots and vehicles by providing distance information of the obstacles in their path. However, although a single sensor can determine an object's distance, two or more sensors must be used to detect the movement of an object. Here, we propose a method to determine the distance and direction of an object traveling to a single sensor using an asymmetrically formed acoustic field. The acoustic field is formed by impedance-varying acoustic meta-surface using an asymmetric Helmholtz resonator array. We present multi-physics simulations using COMSOL and experimental results which show the movement of an acoustic source using a single microphone. Also, we present, explicitly, the effective material parameter variation made by the meta-surface with varying degrees of internal neck lengths.", }