METHOD OF EARLY DETECTION OF FIRE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC G08B17/00 G08B17/117 

FIELD: fire safety.

SUBSTANCE: detection and selection of them in the fire service, and/or at the control station of monitoring among other signals and interference noise in a predetermined frequency range. The device implementing the proposed method comprises gas sensors 1.i (i = 1, 2, …, n), matching the amplifiers 2.i, analogue-to-digital converters 3.i, the microprocessor 4, the shaper 5 of light and sound alarm signals, the indicating light 6, the alarm sounder 7, the output 8 of the shaper 5 which is connected to the central concentrator of fire protection, the shaper of the modulating code 9, the driving oscillator 10, the phase manipulator 11, the power amplifier 12, the transmitting antenna 13, the receiving antenna 14, the high frequency amplifier 15, the beat-frequency oscillator 16, the mixer 17, the intermediate frequency amplifier 18, the phase-splitting circuit 19 into two, the narrow-band filters 20 and 22, the phase doubler 21 and 28, phase shifter 23 by 90°, the phase detector 24, the registration unit 25, the search unit 26, the detector 27 of FMn-signal, the measuring devices 29 and 30 of spectral width, the inverter 31 of spectral width 32 to amplitude, the subtraction unit 33, the threshold unit 34, the key 35, and the delay line 36.

EFFECT: increase in reliability of early fire detection simultaneously at several sites of fire safety by transmitting alarm signals at different frequencies of search.

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