	US 12,188,861 B2
	Methane peak detection
Todd Langland, El Granada, CA (US); Meghan Elizabeth Thurlow, San Francisco, CA (US); Davida Herzl, San Francisco, CA (US); Brian LaFranchi, Berkeley, CA (US); and Robert Murphy, Alameda, CA (US)
Assigned to Aclima Inc., San Leandro, CA (US)
Filed by Aclima Inc., San Francisco, CA (US)
Filed on Aug. 30, 2023, as Appl. No. 18/240,310.
Application 18/240,310 is a continuation of application No. 17/969,241, filed on Oct. 19, 2022, granted, now 11,781,976.
Application 17/969,241 is a continuation of application No. 16/922,929, filed on Jul. 7, 2020, granted, now 11,519,849, issued on Dec. 6, 2022.
Claims priority of provisional application 62/871,473, filed on Jul. 8, 2019.
Prior Publication US 2023/0408403 A1, Dec. 21, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01N 21/31 (2006.01); G01D 21/02 (2006.01); G01N 33/00 (2006.01)

CPC G01N 21/31 (2013.01) [G01D 21/02 (2013.01); G01N 33/004 (2013.01); G01N 2021/3196 (2013.01)]

16 Claims

1. A method for monitoring air quality, comprising:

measuring ethane and methane using a mobile sensor platform to provide sensor data, the sensor data including methane data and ethane data captured at a nonzero mobile sensor platform speed;

identifying, in the sensor data, at least one methane peak and at least one ethane peak;

determining that the at least one ethane peak is in a same window of time as the at least one methane peak;

in response to a determination that the at least one ethane peak is in the same window of time as the at least one methane peak:

determining that a monoxide peak is not in the same window of time as the at least one methane peak and the at least one ethane peak; and

in response to a determination that the monoxide peak is not in the same window of time as the at least one methane peak and the at least one ethane peak:

determining that the at least one methane peak is correlated with the at least one ethane peak;

determining a ratio range of ethane to methane; and

identifying a source for the at least one methane peak based on a first ratio range or a second ratio range, wherein the first ratio range does not overlap the second ratio range.