Intruder detecting security system
AssigneeInternational Business Machines Corporation
InventorsHerman Eugene Amrine, Richard Eugene Baker
Life of this patent
Estimating the term…
Abstract
This electronic perimeter intruder detecting security system is arranged for measuring the differences of propagation times and/or velocities of a plurality of different seismic-like waves simultaneously set up by an intruder at a plurality of sensor stations and for calculating the location, velocity, and frequently for identifying the type of intruder. Provisions are disclosed for screening false alarms or waves emanating from without a guarded zone and for ignoring waves from sources not of interest in guarding that zone.
Claims20
An intruder detecting security system for determining an intrusion across a boundary, comprising
- a plurality of pairs of sensors responsive to waves propagated through geological and like substantially rigid materials with each pair having the sensors arranged operationally orthogonally of each other, and the pairs arranged substantially in line along said boundary,
- analyzing circuitry connected to said sensors for determining the difference in the time for longitudinal and transverse waves set up by a single disturbance to travel from the disturbance to said sensors and
- computing circuitry connected to said analyzing circuitry for resolving location of said disturbance.
A perimeter intruder detecting security system for determining an intrusion into the area within the perimeter, comprising,
- a multiple of pairs of sensors responsive to waves propagated through geological and substantially rigid materials with each pair having the sensors arranged operationally orthogonally of each other, and the pairs orientated substantially along radial and tangential lines with respect to a central location within said area,
- analyzing circuitry connected to said sensors for determining the difference in the times for a single disturbance about said perimeter to travel by shear and by compression waves set up by that single disturbance, and
- computing circuitry connected to said analyzing circuitry for resolving the location of said disturbance by triangulation.
An intruder detecting system for determining an intrusion across a boundary, comprising
- a plurality of pairs of geophones with each pair having the geophones arranged operationally orthogonally of each other and the pairs located substantially along said boundary,
- a plurality of pairs of detector circuits individually coupled to said pairs of geophones and arranged to produce bistatic output signal levels individually in response to activity of the associated geophones,
- analyzing circuitry coupled to said pairs of detector circuits for determining data from the different times for pressure and shear waves generated by a single impact to travel from the point of said single impact to said geophones, and
- computing circuitry coupled to said analyzing circuitry for resolving said data selectively for presentation and utilization and both.
Dependencies are inferred from the claim text.