SMOKE DETECTOR Russian patent published in 2019 - IPC G08B17/103 

FIELD: fire safety.

SUBSTANCE: invention relates to fire alarm. Sensor includes housing with chamber, with holes made therein for ingress of gaseous products arising in case of fire, wherein a light-emitting element and a light receiver are mounted in the camera on one optical axis. At that, light receiver is made in the form of light-emitting diode with radiation wavelength λ_{rad 1}, included in measurement circuit of sensor in galvanic mode of photodiode, and light emitting element is also made in form of light-emitting diode with radiation wavelength λ_{rad 2}, not exceeding λ_{rad 1} light receiver.

EFFECT: simplified design and reduced dependencies on external parasitic illumination.

3 cl, 2 dwg