4 May 2009 Fly-ear inspired acoustic sensors for gunshot localization
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Abstract
The supersensitive ears of the parasitoid fly Ormia ochracea have inspired researchers to develop bio-inspired directional microphone for sound localization. Although the fly ear is optimized for localizing the narrow-band calling song of crickets at 5 kHz, experiments and simulation have shown that it can amplify directional cues for a wide frequency range. In this article, a theoretical investigation is presented to study the use of fly-ear inspired directional microphones for gunshot localization. Using an equivalent 2-DOF model of the fly ear, the time responses of the fly ear structure to a typical shock wave are obtained and the associated time delay is estimated by using cross-correlation. Both near-field and far-field scenarios are considered. The simulation shows that the fly ear can greatly amplify the time delay by ~20 times, which indicates that with an interaural distance of only 1.2 mm the fly ear is able to generate a time delay comparable to that obtained by a conventional microphone pair with a separation as large as 24 mm. Since the parameters of the fly ear structure can also be tuned for muzzle blast and other impulse stimulus, fly-ear inspired acoustic sensors offers great potential for developing portable gunshot localization systems.
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Haijun Liu, Luke Currano, Danny Gee, Benjamin Yang, Miao Yu, "Fly-ear inspired acoustic sensors for gunshot localization", Proc. SPIE 7321, Bio-Inspired/Biomimetic Sensor Technologies and Applications, 73210A (4 May 2009); doi: 10.1117/12.821212; https://doi.org/10.1117/12.821212
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