NASA NTRS · 19700000618
Intruder detection system
Abstract
Moving coil geophones are utilized to develop a small, rugged, battery operated system capable of detecting seismic disturbances caused by intruders. Seismic disturbances sensed by each geophone are converted into electrical signals, amplified, and transmitted to remote receiver which provides listener with aural signal.
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Lee, R. D.. 1970-11-01. Intruder detection system. https://ntrs.nasa.gov/citations/19700000618
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