Passive Portal Detector.
Final technical rept.,
HONEYWELL INC HOPKINS MINN GOVERNMENT AND AERONAUTICAL PRODUCTS DIV
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Honeywell designed a Passive Portal Detector and built two systems, including two frames for outdoor sensor mounting. The Passive Portal Detector is used to sense the passage of a metallic magnetic weapon through a sensor-equipped portal. It signifies detection by illumination of an indicator lamp and by a relay closure, used for an audible or remote alarm. The output indicator has a minimum energized time of approximately one-half second. Sensor panels, providing magnetic sensor coils with vertical and horizontal polarization, are mounted on each side of a portal. Disturbances in the earths magnetic field caused by a magnetic object passing through the portal cause induced voltages in the sensor coils. The signals are amplified by solid-state electronics to a level which can be compared with a reference voltage. When the threshold level is exceeded, alarm circuitry is activated. Author
- Magnetic and Electric Field Detection and Detectors