METHOD FOR EARLY DETECTION OF FIRE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC G08B17/117 

FIELD: fire safety.

SUBSTANCE: invention relates to fire safety and is intended for detection of fire at early stages of smoldering and inflammation of combustible materials. Device implementing proposed method comprises on gas transfer sensor, matching amplifier, analogue-to-digital converter, microprocessor, light and sound alarm signal generator, a light signaling device, an acoustic signaling device, a generator output, a modulating code generator, a master oscillator, a phase manipulator, a power amplifier and a transmitting antenna. At the receiving side, the device for receiving phase-shift keyed composite signals comprises a receiving antenna, a high frequency amplifier, a heterodyne, a mixer, two low-pass filters, system of phase-locked loop, phase shifter for 90°, two multipliers, a phase detector, a recording unit, a carrier frequency meter and a Doppler frequency meter. Invention provides measurement of the carrier frequency and Doppler frequency of the received signals with phase manipulation and determination of mutual movement of the fire hazard object and the monitoring station.

EFFECT: high selectivity and interference immunity of reception and reliability of synchronous detection of phase-shift keyed signals.

2 cl, 5 dwg