Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-03-24
2000-09-19
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340541, 3406935, 250353, G08B 1318
Patent
active
061218766
ABSTRACT:
An infrared intrusion sensing system comprises a compound lens having a plurality of lines of focus for focusing infrared radiation that enters the system onto a detector, and a window to allow infrared radiation to enter the system and then be focused onto the detector by a set of curvilinear-shaped mirrors. The detector is located near the focal point of the compound lens elements and curvilinear-shaped mirror elements. An enclosure surrounding the detector provides isolation from insect entry and constitutes an insect exclusion enclosure envelope. The enclosure envelope is a protective volume of space for the optical paths between the lens or window and the detector that prevents the entry of objects about 1 mm in diameter or larger which could interfere with the optical paths. Pigmenting, texturing, and/or contouring the insect exclusion enclosure surrounding the detector is provided for the purpose of absorbing and/or scattering superfluous radiation that is not focused on the detector, thereby minimizing false alarms and providing improved operating performance by the infrared intrusion sensing system. An alternate embodiment provides an insert for the insect exclusion enclosure which comprises the pigmenting, texturing and/or contouring, and permits easy update of an existing sensor systems.
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C & K Systems Inc.
Hofsass Jeffery A.
La Anh
O'Banion John P.
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