US 12,136,328 B2
Apparatus and method for detecting smoke based on polarization
Hoe Sung Yang, Daejeon (KR); Soo Cheol Kim, Daejeon (KR); Hyun Seok Kim, Daejeon (KR); So Yung Park, Daejeon (KR); Kang Bok Lee, Daejeon (KR); Kwang Soo Cho, Daejeon (KR); and Kyu Won Han, Daejeon (KR)
Assigned to Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed by Electronics and Telecommunications Research Institute, Daejeon (KR)
Filed on Jun. 27, 2022, as Appl. No. 17/849,835.
Claims priority of application No. 10-2021-0186331 (KR), filed on Dec. 23, 2021.
Prior Publication US 2023/0206741 A1, Jun. 29, 2023
Int. Cl. G08B 17/107 (2006.01); G01N 15/06 (2024.01); G01N 21/31 (2006.01); G01N 21/53 (2006.01); G08B 29/18 (2006.01); G01N 15/00 (2006.01); G01N 15/075 (2024.01); G01N 21/47 (2006.01)
CPC G08B 17/107 (2013.01) [G01N 15/06 (2013.01); G01N 21/31 (2013.01); G01N 21/534 (2013.01); G08B 29/185 (2013.01); G01N 2015/0046 (2013.01); G01N 15/075 (2024.01); G01N 2021/4792 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An apparatus for detecting smoke based on polarization, the apparatus comprising:
a chamber into which smoke is introduced;
a detection unit comprising a light-emitting unit configured to emit light beams having a plurality of different wavelengths into a space in the chamber, and a light-receiving unit, comprising a plurality of photodiodes, and configured to receive scattered light from a plurality of light sources of the light-emitting unit;
a control unit configured to control an operation of the detection unit; and
a fire determination unit configured to distinguish between fire smoke and non-fire analogous smoke by detecting and analyzing a light-receiving signal received by the light-receiving unit,
wherein horizontal polarization and vertical polarization are applied to the plurality of light sources of the light-emitting unit and the light-receiving unit,
wherein the light-receiving unit comprises:
a first photodiode of the plurality of photodiodes adopting the horizontal polarization corresponding to the first and second light sources and configured to simultaneously receive the first and second wavelength bands; and
a second photodiode of the plurality of photodiodes adopting the vertical polarization corresponding to the first and second light sources and configured to simultaneously receive the first and second wavelength bands.