Accession Number : AD0770537

Title :   Passive Portal Detector.

Descriptive Note : Final technical rept.,

Corporate Author : HONEYWELL INC HOPKINS MINN GOVERNMENT AND AERONAUTICAL PRODUCTS DIV

Personal Author(s) : Smith,James W.

Report Date : NOV 1973

Pagination or Media Count : 61

Abstract : 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 earth's 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)

Descriptors :   *Magnetic detectors, *Weapons, Schematic diagrams, Small arms

Subject Categories : Magnetic & Electric Fld Detection & Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE