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Proceedings Paper

Spectroscopic analysis of infrared DIAL measurements
Author(s): John R. Quagliano; Page O. Stoutland; Roger R. Petrin; Robert K. Sander; Robert J. Romero; Michael C. Whitehead; Charles Robert Quick; Joseph J. Tiee; L. John Jolin
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Paper Abstract

A combined experimental and computational approach utilizing CO2 infrared gas lasers and chemometric multivariate analysis was employed to detect chemicals and their concentrations in the open atmosphere under controlled release conditions. Absorption spectra of four organic gases were collected in the laboratory by lasing 40 lines of a Synrad 15 W CO2 laser in the 9.3 to 10.8 micron range. Several chemometric calibration models were constructed based on this IR data using the Partial Least Squares computational technique. The chemometric models were used to analyze in near real time the field DIAL data acquired over this exact wavelength range at round trip distances of 7 and 13 km. It will be shown that the ability to predict the chemicals and their respective concentrations depends on a variety of factors. In 39 of the 45 experiments, the identities of the released chemicals were correctly identified without predictions of false positives or false negatives. Under the best field conditions, we achieved predictions of absolute concentrations within 30% of the actual values.

Paper Details

Date Published: 29 March 1996
PDF: 12 pages
Proc. SPIE 2702, Gas and Chemical Lasers, (29 March 1996); doi: 10.1117/12.236875
Show Author Affiliations
John R. Quagliano, Los Alamos National Lab. (United States)
Page O. Stoutland, Los Alamos National Lab. (United States)
Roger R. Petrin, Los Alamos National Lab. (United States)
Robert K. Sander, Los Alamos National Lab. (United States)
Robert J. Romero, Los Alamos National Lab. (United States)
Michael C. Whitehead, Los Alamos National Lab. (United States)
Charles Robert Quick, Los Alamos National Lab. (United States)
Joseph J. Tiee, Los Alamos National Lab. (United States)
L. John Jolin, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2702:
Gas and Chemical Lasers
Robert C. Sze, Editor(s)

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