The invention discloses an early
fire smoke detecting method with interference particle recognition capability. A
transmitter and two receivers are arranged in a
detector, the
transmitter can emit twodifferent wavelengths of light, and the two receivers are used to collect two kinds of
scattered light power at different angles; the
scattered light power at two different angles under certain
wavelength conditions can be simultaneously measured, thereby obtaining the
asymmetry ratio by calculating the ratio. By letting the
transmitter alternately emit beams of different wavelengths in the pulseform, the forward-backscattered
optical power signals at different wavelengths can be obtained, as well as their changes over time. According to the method, the
asymmetry ratio of different
wavelength conditions is utilized to distinguish
fire smoke particles from common interference particles; combined with the
asymmetry ratio and its fluctuation characteristics, the detection of early
fire smoke particles can be achieved; a
signal strength threshold is not used to determine whether an alarm should be mode. Therefore, the detection method can respond to the fire black and white
smoke particles in a balanced manner.