Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1987-10-19
1989-06-20
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
250342, G08B 1318
Patent
active
048412848
ABSTRACT:
In the present invention, an infrared intrusion detection system is disclosed. The infrared intruder detector is typically mounted at a vertical height from a ground plane. The detector has a fresnel lens which has a plurality of lines of focus for focusing infrared radiation received by the detection system through the fresnel lens. A detector in the detection system is located at the focal point for receiving infrared radiation through the fresnel lens. A curvilinearly-shaped mirror is placed apart from the detector in the direction away from the detection plane for receiving infrared radiation from the detection plane and the reflecting and focusing the detected infrared radiation onto the detector.
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C & K Systems Inc.
Mullen Jr. Thomas J.
Swann III Glen R.
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