US 12,270,759 B2
Gas detection device
Masatoshi Hirono, Yokohama Kanagawa (JP); Shinji Saito, Yokohama Kanagawa (JP); Tsutomu Kakuno, Fujisawa Kanagawa (JP); Rei Hashimoto, Tokyo (JP); and Kei Kaneko, Yokohama Kanagawa (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP)
Filed by Kabushiki Kaisha Toshiba, Tokyo (JP)
Filed on Feb. 14, 2023, as Appl. No. 18/168,838.
Claims priority of application No. 2022-043748 (JP), filed on Mar. 18, 2022.
Prior Publication US 2023/0296504 A1, Sep. 21, 2023
Int. Cl. G01N 21/3504 (2014.01)
CPC G01N 21/3504 (2013.01) [G01N 2201/06113 (2013.01); G01N 2201/0636 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gas detection device, comprising:
a first light source irradiating infrared;
a second light source irradiating visible light;
a low-pass filter transmitting the infrared irradiated from the first light source, reflecting the visible light irradiated from the second light source, and aligning an optical axis of the visible light with an optical axis of the infrared;
a first retroreflector on which the infrared and the visible light having the aligned optical axes are incident;
a first detecting part detecting the infrared reflected by the first retroreflector; and
a scattering body located at a center of the first retro reflector.