Abstract: A sensor array that forms part of an intrusion detection system, which is adapted for use on narrow spaced objects that surround a perimeter. The sensor array includes one or more intrusion detection sensor nodes and an array processor. The one or more sensor nodes include one or more discrete sensors that form a detection zone that is defined by a plane that extends transversely from a longitudinal axis of each sensor node. Each sensor node may also include a node processor for processing a response generated by the sensors when an intruder enters a nodes detection zone. The array processor of the sensor array is connected to each sensor node and receives and processes alarm disturbance signatures from each node processor.

Abstract: An intrusion detection system provides the function of an “active” ranging sensor cable system utilized for identification of the location of the intruder, with that of a “passive” cable detection system, in an integrated cable configuration. This dual function is provided with a single conventional sensing cable optimized for both “active” and “passive” sensing, or in combination with other parallel sensing cables for a “passive” cable component. The “active” cable component includes a coaxial sensor cable having a loosely disposed conductor. A signal is injected into the sensor cable such that a reflection is altered when an intrusion disturbs the cable. Based on the timing of the reflection, a processor, or a reflectometer, identifies the location of the disturbance. The “passive” cable component can be sensitized to detect intrusion via some other sensing phenomenology, such as the triboelectric effect, for triboelectric effect sensing.

Abstract: A method of manufacturing leaky coaxial cables having an array of apertures in the conductive outer layer. The total area of the apertures is a predetermined fraction of the surface area of the cable. A pair of strip conductors of particular widths are selected and wound around the inner conductor and dielectric at predetermined pitch angles. This provides apertures having a total area which is a predetermined fraction of the surface area of the cable, a predetermined shape and being of a predetermined number per unit length. By varying the pitch angle during winding the distribution of apertures and hence the coupling of the cable can be varied. By testing short sections of cables of different geometry a coupling function and an attenuation function can be calculated to provide data for winding cables with desired characteristics.