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Acoustic tamper detection sensor with very low false alarm rate

Abstract
We describe a device designed to detect interference (vandalism or tampering) by acoustic means. The design employs both a piezoelectric vibration transducer and a common microphone in a novel mechanical arrangement. In contrast to conventional acoustic sensors that simply respond to vibrations above a threshold, this design analyses the outputs of the two to trigger an alarm. The method confers a near-zero susceptibility to triggering by external loud noises. No complex calculations are required so that only a low-cost, embedded microcontroller is required and the whole sensor can be very cheap. Extreme sensitivity can be achieved with little risk of false alarms.
Type
Journal Article
Type of thesis
Series
Citation
Muijlwijk, L. & Scott, J. B. (2008). Acoustic tamper detection sensor with very low false alarm rate. In Proceedings of the 42nd Annual IEEE International Carnahan Conference on Security Technology. Institute of Electrical and Electronics Engineers, Prague, Czech Republic; 13-16 October, 2008 (pp. 94-97). Washington, DC, USA: IEEE.
Date
2008
Publisher
IEEE
Degree
Supervisors
Rights
©2008 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.