Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1988-05-18
1990-08-28
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340556, 356 4, G08B 1318
Patent
active
049529110
ABSTRACT:
A scanning intrusion detection device is capable of monitoring a large volume of either interior or exterior space from a single relatively inexpensive unit. This intrusion detection device comprises a radiation emitter arranged to scan a beam of infrared radiation about a field of view and means for receiving the radiation of the beam reflected from the field of view. The receiver is arranged to generate a signal indicative of the distance from the device at which the beam has been reflected for each of a plurality of azimuthal sectors of the field of view during a selected time period. A ram is also provided for storing a plurality of reference signals which are indicative of the distance of reflection of the beam from each azimuthal sector of the field of view during a reference time period. The signals from a selected time period are compared with the reference signals and an output signal is generated if one of the signals is different from the respective reference signal.
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D'Ambrosia George C.
Ludden Christopher A.
Eastman Kodak Company
Randall Robert L.
Swann III Glen R.
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