Development of a fluorescence lidar for measurement of atmospheric formaldehyde

Anand Radhakrishnan Mylapore; Mikhail Yakshin; Alexander Achey; In Heon Hwang; Sangwoo Lee; Nikhil Mehta; Geary K. Schwemmer; Coorg R. Prasad; Thomas F. Hanisco

doi:10.1117/12.2053420

9 June 2014 Development of a fluorescence lidar for measurement of atmospheric formaldehyde

Anand Radhakrishnan Mylapore, Mikhail Yakshin, Alexander Achey, In Heon Hwang, Sangwoo Lee, Nikhil Mehta, Geary K. Schwemmer, Coorg R. Prasad, Thomas F. Hanisco

Author Affiliations +

Proceedings Volume 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI; 90800X (2014) https://doi.org/10.1117/12.2053420
Event: SPIE Defense + Security, 2014, Baltimore, MD, United States

Abstract

In this paper, we describe the development of a prototype differential absorption fluorescence lidar for nighttime tropospheric formaldehyde (H₂CO) concentration profiling. H₂CO has a strong absorption band in the 352-357nm region and fluoresces strongly in the 390-500nm region. Here, we obtain high sensitivity (∼0.1ppb) measurements of H₂CO profiles from differential fluorescence signals obtained by injection seeding a Nd:YVO laser and tuning its wavelength on and off the peak of a strong absorption line. The fluorescence signal strength is further improved by using a multi-line bandpass filter whose pass-bands are aligned to multiple fluorescence peaks of H₂CO. A H₂CO filled photo-acoustic absorption cell is utilized for tuning the seed laser wavelength to the center of absorption line.

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Anand Radhakrishnan Mylapore, Mikhail Yakshin, Alexander Achey, In Heon Hwang, Sangwoo Lee, Nikhil Mehta, Geary K. Schwemmer, Coorg R. Prasad, and Thomas F. Hanisco "Development of a fluorescence lidar for measurement of atmospheric formaldehyde", Proc. SPIE 9080, Laser Radar Technology and Applications XIX; and Atmospheric Propagation XI, 90800X (9 June 2014); https://doi.org/10.1117/12.2053420

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