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.
Permanent Research Commons link: http://hdl.handle.net/10289/3337
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.
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