Apparatus and method for detecting smoke using multi-angle light scattering

An apparatus for detecting smoke, the apparatus comprising:

• a light source array in which a plurality of light sources outputting optical signals of a same wavelength are arranged at a regular interval and configured to output the optical signals at different irradiation angles to smoke particles;
• a lens configured to divert optical paths of the optical signals output from each of the plurality of light sources included in the light source array;
• an optical detector configured to measure the optical signals that pass through the lens and are scattered and absorbed by the smoke particles;
• and
• a computing device configured to classify types of the smoke particles using a scattering coefficient and an absorption coefficient of the smoke particles determined through the measured optical signals,
• wherein the computing device is further configured to:
• identify optical intensity of the optical signals measured by the optical detector;
• normalize the identified optical intensity of the optical signals;
• using the normalized optical intensity of the optical signals, derive a full width at half maximum (FWHM) of an optical irradiation angle;
• and
• using the derived FWHM, determine the scattering coefficient of the smoke particles.