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Surveillance technique for natural or artificial structures - uses detection of acoustic stress pulses in structure, converted to electric signals
Surveillance technique for natural or artificial structures - uses detection of acoustic stress pulses in structure, converted to electric signals
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机译:天然或人造结构的监视技术-使用结构中的声应力脉冲检测,转换为电信号
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摘要
A surveillance technique is described for natural or artificial structures such as sites or works of art. Acoustic stress pulses are sensed and detected on or in one or more structural elements. These acoustic pulses are transformed into electrical signals which are filtered so that only those pulse components lying within a know frequency band are transmitted. These components are converted into peaks whose level crosses the mean level of the corresponding components. Only those peaks whose levels are greater than a predetermined threshold are transmitted. The transmitted peaks are counted periodically to determine their rate.
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