US 11,867,619 B1
Air quality monitoring system and method
Anna Ailene Scott, Austin, TX (US); Nasr E. Alkadi, Edmond, OK (US); Yan Azdoud, Austin, TX (US); Nathan C. Eichenlaub, Denver, CO (US); William J. Foiles, Denver, CO (US); Christopher Daniel Kelley, Austin, TX (US); and Shyla Kupis, Atlanta, GA (US)
Assigned to PROJECT CANARY, PBC, Denver, CO (US)
Filed by Project Canary, PBC, Denver, CO (US)
Filed on Sep. 1, 2023, as Appl. No. 18/241,776.
Application 18/241,776 is a continuation of application No. 18/205,445, filed on Jun. 2, 2023, granted, now 11,781,979.
Application 18/205,445 is a continuation of application No. 18/098,430, filed on Jan. 18, 2023, granted, now 11,754,495.
Application 18/098,430 is a continuation of application No. 17/843,613, filed on Jun. 17, 2022, granted, now 11,592,390, issued on Feb. 28, 2023.
Application 17/843,613 is a continuation of application No. 17/843,554, filed on Jun. 17, 2022, granted, now 11,585,752, issued on Feb. 21, 2023.
Application 17/843,554 is a continuation of application No. 17/541,693, filed on Dec. 3, 2021, granted, now 11,366,057, issued on Jun. 21, 2022.
Application 17/541,693 is a continuation of application No. PCT/US2021/049702, filed on Sep. 9, 2021.
Claims priority of provisional application 63/233,694, filed on Aug. 16, 2021.
Claims priority of provisional application 63/076,829, filed on Sep. 10, 2020.
Int. Cl. G01N 21/35 (2014.01); G01N 21/3504 (2014.01); G01N 33/00 (2006.01); G01P 13/04 (2006.01)
CPC G01N 21/3504 (2013.01) [G01N 33/0036 (2013.01); G01P 13/045 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An identification method for identifying a target chemical at a site, the identification method comprising:
providing a sampling inlet to:
capture a sample of air from an atmosphere surrounding the site;
providing a compound sensor, comprising:
a sample cell to receive the sample of air from the sampling inlet;
a light source adjoined to the sample cell to emit a beam of light,
wherein the beam of light passes through the sample cell; and
a spectrophotometer adjoined to the sample cell;
generating a first transmission spectrum of the beam of light with the spectrophotometer;
transmitting a sample of air for interacting with the beam of light in the sample cell;
generating a second transmission spectrum of the beam of light in response to interacting the sample of air with the beam of light with the spectrophotometer;
processing the second transmission spectrum by:
denoising and de-biasing the second transmission spectrum to generate a processed second transmission spectrum;
generating an absorption spectrum of the beam of light by calculating absorbance of the beam of light by the sample of air based on:
comparing the first transmission spectrum to the processed second transmission spectrum; and
identifying the target chemical by decomposing the absorption spectrum to extract an absorption spectra related to the target chemical.