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(11) | EP 0 078 443 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Fire detection system |
(57) An optical fire detector has a radiant energy detector mounted within a housing including
a window through which radiant energy is received by the detector. An optical fiber
bundle arranged in the wall of the housing has an end emitting light to the detector
through the window, and another end receiving light from a test lamp also within the
housing but shielded from the detector by an optical shield. |