Apparatus for detecting fires in a wide area, particularly forest fires

Abstract

Abstract A fire-detection apparatus for monitoring wide areas consists of an azimuthally movable scanning device (1), which is mounted in an elevated position and has a reflector (6) in whose focal plane there are provided on a common support (7) a series of adjacent pairs (S, S') of sensor elements which are sensitive to infrared radiation, have an extent which increases upwards starting from the optical axis (A), and are connected to one another in an increasingly insensitive circuit. As a result, an area of virtually the same size is covered in the reception fields (R) of different elevation (b), and a sensitivity of detection is achieved which is independent of distance. In order to eliminate false alarms due to intensive insolation, light-sensitive solar cells (C) are provided parallel to the infrared sensor elements (S) in an inhibition circuit therewith. …<IMAGE>…

Inventors

• 👤 Kurt Albert Müller
• 👤 Christoph Enderli
• 👤 Peter Ryser

Bibliographic Details