Intelli-FIELD (TM) the next generation electrostatic field disturbance sensor

Outdoor perimeter volumetric field disturbance sensors must reliably detect perturbations to the field caused by an intruder, while rejecting noise an d environmental changes that may be orders of magnitude greater than the ta rget response. Currently, E-Field((R)) systems are widely deployed in nucle ar, correctional, and industrial sites to provide perimeter security. These systems are effective in rejecting the majority of noise and environmental stimuli through combined fixed attribute threshold comparison techniques, However, some environmental stimuli closely mimic target stimuli, so improv ed discrimination techniques have been sought. We describe the results of current studies and investigations of electrosta tic sensor system response to targets and to various environmental changes. Fundamental principles in the character of sensor response to these varied stimuli are discussed. Techniques and methods that may be used to exploit the difference between intruder and environmental responses, while using co st-effective discrimination methods, are described. We show how the new Int elli-FIELD system was created, using currently available technologies, to p rovide both excellent detection properties, and an extremely low nuisance a larm rate, while, at the same time, greatly simplifying installation, calib ration, and maintenance. The details of the new system hardware components and test results from initial field installations are described. A comparis on of field performance with the previous E-Field product is provided to in dicate the advantages of this new sensor technology.