Mathematical Analysis and Micro-Spacing Implementation of Acoustic Sensor Based on Bio-Inspired Intermembrane Bridge Structure

• Published in: Sensors (Basel, Switzerland) Vol. 21; no. 9; p. 3168
• Main Authors: Shen, Xiang, Zhao, Liye, Xu, Jiawen, Yao, Xuwei
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 03.05.2021; MDPI
• Subjects: Acoustics; amplification of phase and amplitude; Biomimetics; Bionics; Design; directional recognition of sound source; Ears & hearing; Elastic beams; Frequency ranges; intermembrane bridge structure; Localization; mathematical analysis and structural simulation; Mathematical models; Membranes; Microphones; microscale implementation; Ormia ochracea; Phase shift; Recognition; Sensors; Sound sources; Sound waves
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s21093168

A biomimetic study on the auditory localization mechanism of Ormia ochracea was performed to improve the localization ability of small acoustic systems. We also present a microscale implementation of an acoustic localization device inspired by the auditory organ of the parasitic O. ochracea. The device consists of a pair of circular membranes coupled together with an elastic beam. The coupling serves to amplify the difference in magnitude and phase between the two membranes’ responses as the incident angle of the sound changes, allowing directional information to be deduced from the coupled device response. The research results show that the intermembrane bridge structure improves the sound source localization and directional weak acoustic signal acquisition of sound detectors. The recognition rate of the phase difference and amplitude ratio was greatly improved. The theoretical resolution of the incident angle of the sound source can reach 2° at a phase difference recognition rate of 5°. The sound source’s optimal identification frequency range for the coupling device based on the intermembrane bridge bionic structure is 300 Hz to 1500 Hz.