US 12,345,632 B2
Fully compensated optical gas sensing system and apparatus
Shrenik Deliwala, Andover, MA (US)
Assigned to ANALOG DEVICES, INC., Wilmington, MA (US)
Filed by Analog Devices, Inc., Wilmington, MA (US)
Filed on Oct. 11, 2023, as Appl. No. 18/484,971.
Application 18/484,971 is a continuation of application No. 17/327,172, filed on May 21, 2021, granted, now 11,821,836.
Claims priority of provisional application 63/051,042, filed on Jul. 13, 2020.
Prior Publication US 2024/0085318 A1, Mar. 14, 2024
Int. Cl. G01N 21/3504 (2014.01); G01N 21/01 (2006.01)
CPC G01N 21/3504 (2013.01) [G01N 21/01 (2013.01); G01N 2021/3513 (2013.01); G01N 2201/0636 (2013.01); G01N 2201/1211 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An optical differential path length gas detector, comprising:
a first light source configured to emit a first light centered at a first wavelength;
a second light source configured to emit a second light centered at a second wavelength; and
a mirror, disposed facing the first light source and the second light source, configured to reflect the second light emitted from the second light source onto the first light source, and to permit the first light emitted from the first light source and the second light after reflection by the first light source to pass through an aperture in the mirror that is facing the first light source.