Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1994-01-31
1996-02-13
Swann, Glen
Communications: electrical
Condition responsive indicating system
With particular system function
340554, 340567, G08B 1319, G08B 1324
Patent
active
054914671
ABSTRACT:
A dual technology intrusion detection device has a microwave detection sub-system, employing a bent mono-pole as an antenna to generate a symmetrical conically shaped volume of protection. The intrusion detection system also has a passive infrared intrusion detection sub-system, employing a hemispherically shaped fresnel lens having a plurality of lens segments, to detect infrared radiation from a plurality of spaced apart fields of view in a right symmetrical cone. The volume of protection for the infrared intrusion detector and microwave detector substantially coincide. In addition, the microwave detection sub-system employs a single bipolar transistor and a variable trim capacitor to generate the microwave energy and also uses the single bipolar transistor in an autodyne mode to mix the received microwave radiation.
REFERENCES:
patent: 4710750 (1987-12-01), Johnson
patent: 5017783 (1991-05-01), Mousavi
patent: 5023594 (1991-06-01), Wallace
patent: 5221919 (1993-06-01), Hermans
patent: 5331308 (1994-07-01), Buccola et al.
U.S. patent application Ser. No. 07/817,339, filed Jun. 1, 1992, Wallace.
Bamford Jeffrey
Eggers Frederick W.
Houston David
Tracy Lawrence R.
Wallace Walter B.
C & K Systems Inc.
Swann Glen
Yin Ronald L.
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