US 11,714,047 B2
Method to determine gas absorption in rapidly tuned diode lidar
Xiao Ai, Bristol (GB); and James Titchener, Bristol (GB)
Assigned to QLM Technology Limited, Bristol (GB)
Filed by QLM Technology Limited, Bristol (GB)
Filed on Jul. 7, 2022, as Appl. No. 17/811,223.
Application 17/811,223 is a continuation of application No. 17/805,937, filed on Jun. 8, 2022, abandoned.
Claims priority of provisional application 63/202,377, filed on Jun. 8, 2021.
Prior Publication US 2022/0390361 A1, Dec. 8, 2022
Int. Cl. G01N 21/3504 (2014.01); G01N 21/39 (2006.01); G01S 17/88 (2006.01); G01S 7/4911 (2020.01)
CPC G01N 21/3504 (2013.01) [G01N 21/39 (2013.01); G01S 7/4911 (2013.01); G01S 17/88 (2013.01); G01N 2021/399 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of measuring the concentration of a gas in a target environment using a laser lidar system, the method comprising:
directing a laser beam towards a target environment containing the gas;
tuning the laser wavelength over a wavelength range including an absorption line of the gas;
measuring intensity of laser light, returned from the environment containing the gas as a result of scattering, as a function of time;
converting the intensity vs time into gas absorption vs wavelength; and
using the gas absorption vs wavelength to determine the concentration of the gas in the target environment,
wherein the variation of wavelength with time during the tuning period is non-linear.