SCATTERED LIGHT SMOKE DETECTOR

The invention relates to a scattered light smoke detector containing an optoelectronical assembly for measuring scatter signals (SB, SF) detected below at least one forward scatter angle and at least one backscatter angle and evaluation electronics for determining an alarm value in accordance with the difference between the scatter signals (SB, SF). Smoke signals (BW, FW) are produced from the scatter signals (SB, SF) by means of a pre-processing step (14) and a measured value (S) is obtained from the smoke signals. The measured value (S) is formed by a linear linking of the sum of the smoke signals (BW, FW) to the difference between the smoke signals (BW, FW) or by establishing the value for the difference between the smoke signals (BW, SW). The linear linking is calculated according to the formula [k1(BW+FW) + k2(BW-FW)], in which k1 and k2 represent two constants that are influenced among others by an application factor that is dependent on the environmental conditions in the installation location of the detector.