Method of intrusion detection over a wide area

Details Method of intrusion detection over a wide area Method of intrusion detection over a wide area

1988-05-18

1990-10-30

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340556, 356 1, 356 4, G08B 1318

Patent

active

049671839

ABSTRACT:
A method of scanning intrusion detection which is capable of monitoring a large volume of either interior or exterior space from a single relatively inexpensive unit. This method of intrusion detection comprises the steps of scanning a beam of infrared radiation about a field of view and receiving the radiation of the beam reflected from the field of view, generating 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, 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, comparing the signals from a selected time period with the reference signals, and generating an output signal if one of the signals is different from the respective reference signal.

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patent: 4601574 (1986-07-01), Yamane et al.
patent: 4771307 (1988-09-01), Kuno et al.

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