Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-03-02
1993-06-08
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
2503381, 250342, 250395, 250554, G08B 1712
Patent
active
052183459
ABSTRACT:
In fire detector apparatus for monitoring an extended area from an elevated location, and especially for detecting forest fires, a scanning assembly (1) has azimuthal freedom of movement. A row of adjoining infrared detector element pairs (S, S') is disposed on a common support (7) in the focal plane of a reflector (6). Detector extent or area increases from the optical axis upward, and the detectors are connected with decreasingly sensitive circuitry. As a result, detection areas having different elevations have nearly equal distance range, and detection sensitivity is essentially independent of distance so that a remote forest fire is detected with the same degree of certainty as one close by. For the elimination of false alarms due to diffuse thermal radiation, detector elements are arranged in pairs, side-by-side on the same support (7), and connected in differential circuitry. For the elimination of false alarms due to intense sunlight, light-sensitive solar cells are connected in parallel with the infrared detectors in an inhibition circuit.
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Enderli Christoph
Muller Kurt A.
Ryser Peter
Cerberus AG
Swann III Glen R.
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