SCATTERED LIGHT DETECTOR AND ASPIRATING FIRE DETECTION SYSTEM WITH A SCATTERED LIGHT DETECTOR

摘要

The invention relates to a scattered light detector (200) for the detection of particles, more particularly smoke particles (320) in a test fluid, more particularly for use in an aspirating fire detection system (100), having a test section (210) with a flow inlet (212) and a flow outlet (213) for forming a flow path (310) through which the test fluid can flow, a light transmitter (230), which transmits a light beam (231) in a radiation direction (A), with the transmitted light beam (231) forming an intersection region (X) with the flow path (310), a light receiver (240) for receiving a scattered light fraction (233) scattered on smoke particles (320) in the intersection region (X), and a printed circuit board (220). The light transmitter (230) and the light receiver (240) are connected to the printed circuit board (220), more particularly to a front of the printed circuit board (220), with the light beam (231) transmitted by the light transmitter (230) being guided into the test section (210) by means of an optical fibre (232) deflecting the light beam (231), and the light receiver (240) is arranged in such a manner that a direct or indirect scattered light path (S) runs between the light receiver (240) and the intersection region (X).