This work was performed under the auspices of the U.S. Based on simulations we found that multiple small arrays can greatly improve the system's detection capability in the presence of underground structures. We will show simulation results of the effect of an underground concrete block at shielding the seismic signal coming from an intruder. One of the drawbacks of using a single array system is its inefficiency at detecting seismic signals deflected by large underground objects. The performance of the array was also analyzed in detecting two or more objects moving at the same time. Frequency-wave number analysis of the synthetic array data was used to demonstrate the array's capability at accurately determining intruder's movement direction. The seismic source is modeled as a vertical force acting on the ground that generates continuous impulsive seismic signals with different predominant frequencies. We have carried out numerical experiments to demonstrate the capability of a seismic array to detect moving targets that generate seismic signals.
#Andor solis spool external trigger series#
Using a series of real-time signal processing algorithms the system detects, classify and monitors the intruder's movement. A seismic intruder detection system uses one or multiple arrays of geophones design to record seismic signals from footsteps and ground vehicles. Geophone arrays have the capability to provide cost effective intruder detection in protecting assets with large perimeters. Seismic sensors such as geophones and fiber optic have been increasingly recognized as promising technologies for intelligence surveillance, including intruder detection and perimeter defense systems. Small Arrays for Seismic Intruder Detections: A Simulation Based Experiment A process for the automatic counting of radon registered by a radon monitor is also provided.
#Andor solis spool external trigger registration#
The flexible track registration material is capable of being spliced such that the registration material from a plurality of monitors can be spliced into a single strip to facilitate automatic processing of the registration material from the plurality of monitors. A flexible track registration material is located within the housing that records alpha-particle emissions from the decay of radon and radon daughters inside the housing. The signal makes it possible for an operator to determine the number of intruders and the manner of movement.Īutomatically processed alpha-track radon monitorĪn automatically processed alpha-track radon monitor is provided which includes a housing having an aperture allowing radon entry, and a filter that excludes the entry of radon daughters into the housing. The system contains a transmitter which sends a frequency modulated and amplitude modulated signal to a remote receiver in response to a geophone detector which responds to seismic impulses created by the intruder. An intruder detection system is described.
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