US 11,788,889 B1
Air quality monitoring system and method
Anna Ailene Scott, Austin, TX (US); Yan Azdoud, Austin, TX (US); and Christopher Daniel Kelley, Austin, TX (US)
Assigned to PROJECT CANARY, PBC, Denver, CO (US)
Filed by Project Canary, PBC, Denver, CO (US)
Filed on Jun. 9, 2023, as Appl. No. 18/208,056.
Application 17/962,171 is a division of application No. 17/716,326, filed on Apr. 8, 2022, granted, now 11,467,032, issued on Oct. 11, 2022.
Application 17/716,326 is a division of application No. 17/540,497, filed on Dec. 2, 2021, granted, now 11,346,717, issued on May 31, 2022.
Application 16/953,908 is a division of application No. 16/823,205, filed on Mar. 18, 2020, granted, now 10,876,890, issued on Dec. 29, 2020.
Application 16/823,205 is a division of application No. 16/188,793, filed on Nov. 13, 2018, granted, now 10,634,558, issued on Apr. 28, 2020.
Application 18/208,056 is a continuation of application No. 18/113,311, filed on Feb. 23, 2023.
Application 18/113,311 is a continuation of application No. 17/962,171, filed on Oct. 7, 2022, granted, now 11,604,094, issued on Mar. 14, 2023.
Application 17/540,497 is a continuation of application No. 16/953,908, filed on Nov. 20, 2020, granted, now 11,193,822, issued on Dec. 7, 2021.
Int. Cl. G01J 3/26 (2006.01); G01N 33/00 (2006.01); G02B 26/00 (2006.01); G01N 15/14 (2006.01)
CPC G01J 3/26 (2013.01) [G01N 15/1404 (2013.01); G01N 15/1436 (2013.01); G01N 33/0006 (2013.01); G01N 33/0031 (2013.01); G02B 26/001 (2013.01)] 24 Claims
OG exemplary drawing
 
1. An air quality monitoring method comprising:
accepting analyte gas into a cell coated with:
a light-absorbing coating;
emitting light rays into the analyte gas;
reflecting the light rays into the analyte gas repeatedly across the cell;
directing the light rays across a path within the cell into at least one sensor in response to repeated reflections;
absorbing, by the light-absorbing coating of the cell, stray light rays from the light rays emitted into the analyte gas;
generating a first spectra signal and a second spectra signal in response to directing the light rays into the at least one sensor;
deconvoluting the first spectra signal and the second spectra signal based on properties of a light source emitting the light rays and optical properties of the at least one sensor at current temperature and pressure within the cell to generate a deconvoluted first spectra signal and a deconvoluted second spectra signal; and
determining a gaseous chemical based on the deconvoluted first spectra signal.