Correction scheme for experimental biases in differential absorption lidar tropospheric ozone measurements based on the analysis of shot per shot data samples

From lidar signals detected with a shot/shot differential absorption lidar instrument tuned for tropospheric O3 measurements and recording each individual return, histograms of their sampled values for each channel of their digitizers were reconstructed. Anal. of their shape permits correction of measurements for exptl. biases. In particular, a neg. correlation was obsd. between the histogram skew and the intensity of backscattered light. The skew comes from a tail at high sampled values, interpreted as due to a raise of the relative contribution to the signal of a signal-induced noise when this intensity diminishes. By fitting a Gaussian function to the histograms without considering their tails, av. signals unbiased by the corresponding noise were calcd. This approach allows an increase the range of O3 profiles, up to as much as double, in some cases.


Published in:
Applied Optics, 36, 27, 6857-6863
Year:
1997
Keywords:
Note:
Copyright 2003 ACS
CAPLUS
AN 1997:627862
CAN 127:297706
59-1
Air Pollution and Industrial Hygiene
79
Shot per Shot Lidar Group, Laboratory for Air and Soil Pollution,Ecole Polytechnique Federal Lausanne,Lausanne,Switz. FIELD URL:
Journal
APOPAI
written in English.
Air analysis; Lidar (correction scheme for exptl. biases in differential absorption lidar tropospheric detn. of tropospheric ozone based on anal. of shot per shot data samples)
Laboratories:




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