Abstract

A system using a nonlinear multiswept sine wave is described, which employs multichannel multiswept orthogonal waves, to separate channels and make multiple, simultaneous online/offline ${\mathrm{CO}}_2$ measurements. An analytic expression and systematic method for determining the orthogonal frequencies for the unswept, linear swept, and nonlinear swept cases is presented. It is shown that one may reduce sidelobes of the autocorrelation function while preserving cross channel orthogonality, for thin cloud rejection.

Advanced sine wave modulation of continuous wave laser system for atmospheric CO₂ differential absorption measurements

Joel F. Campbell, Bing Lin, and Amin R. Nehrir
Appl. Opt. 53(5) 816-829 (2014)

Binary phase shift keying on orthogonal carriers for multi-channel CO₂ absorption measurements in the presence of thin clouds

Joel F. Campbell, Bing Lin, Amin R. Nehrir, F. Wallace Harrison, and Michael D. Obland
Opt. Express 22(S6) A1634-A1640 (2014)

Atmospheric CO₂ column measurements with an airborne intensity-modulated continuous wave 1.57 μm fiber laser lidar

Jeremy T. Dobler, F. Wallace Harrison, Edward V. Browell, Bing Lin, Doug McGregor, Susan Kooi, Yonghoon Choi, and Syed Ismail
Appl. Opt. 52(12) 2874-2892 (2013)

Modeling of intensity-modulated continuous-wave laser absorption spectrometer systems for atmospheric CO₂ column measurements

Bing Lin, Syed Ismail, F. Wallace Harrison, Edward V. Browell, Amin R. Nehrir, Jeremy Dobler, Berrien Moore, Tamer Refaat, and Susan A. Kooi
Appl. Opt. 52(29) 7062-7077 (2013)

Airborne measurements of CO₂ column absorption and range using a pulsed direct-detection integrated path differential absorption lidar

James B. Abshire, Haris Riris, Clark J. Weaver, Jianping Mao, Graham R. Allan, William E. Hasselbrack, and Edward V. Browell
Appl. Opt. 52(19) 4446-4461 (2013)