Optical smoke detector and method thereof

The invention provides a smoke detector and a method thereof. The smoke detector comprises a detection cavity (210), at least one light source (220), at least one light receiver (230) and a controller (240) connected to the light source (220) and the light receiver (230). The controller (240) is configured to emit a contamination failure (FAULT) message within a predetermined time period (P) after power-on if it is determined that the optical signal (S) detected by the optical receiver (230) is greater than a predetermined threshold (Th) and the detected optical signal (S) exhibits a small fluctuation during the predetermined time period (P). The smoke detector can report a pollution fault message in time after being powered on, and can accurately report a fire alarm if a fire occurs when the smoke detector is powered on. 本发明提出一种烟感探测器及其方法。该烟感探测器包括：一个探测腔(210)、至少一个光源(220)、至少一个光接收器(230)和一个连接到所述光源(220)和所述光接收器(230)的控制器(240)。该控制器(240)配置成在上电后的一个预定时段(P)内，若确定所述光接收器(230)探测到的光信号(S)大于一个预定的阈值(Th)，且所述探测到的光信号(S)在所述预定时段(P)期间