Composite fire detection algorithm based on 3 infrared rays

The invention discloses a composite fire detection algorithm based on 3 infrared rays. The algorithm comprises the steps of selecting a 4.4 mu m pyroelectric sensor as a main sensor and 3.8 mu m and 5.0 mu m pyroelectric sensors as auxiliary sensors, and carrying out data acquisition on a fire scene; processing acquired 4.4 mu m, 3.8 mu m and 5.0 mu m waveband pyroelectric signal data, and the main algorithms comprising out-of-limit sample number calculation on the data, standard deviation calculation, and wave crest and wave trough number calculation; if all basic algorithm results above the4.4 mu m waveband pyroelectric signal conform to an alarm response threshold value, carrying out the next step of calculation, otherwise, jumping out; and on the basis of the algorithm value of the 4.4 mu m waveband pyroelectric signal, carrying out one-to-one correspondence difference calculation on the other two paths of algorithm values, and if all difference calculation results conform to a set threshold value, giving