Spectroscopic analysis of infrared DIAL measurements

John R. Quagliano; Page O. Stoutland; Roger R. Petrin; Robert K. Sander; Robert J. Romero; Michael C. Whitehead; Charles Robert Quick Jr.; Joseph J. Tiee; L. John Jolin

doi:10.1117/12.236875

29 March 1996 Spectroscopic analysis of infrared DIAL measurements

John R. Quagliano, Page O. Stoutland, Roger R. Petrin, Robert K. Sander, Robert J. Romero, Michael C. Whitehead, Charles Robert Quick Jr., Joseph J. Tiee, L. John Jolin

Author Affiliations +

Proceedings Volume 2702, Gas and Chemical Lasers; (1996) https://doi.org/10.1117/12.236875
Event: Photonics West '96, 1996, San Jose, CA, United States

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.

Citation Download Citation

John R. Quagliano, Page O. Stoutland, Roger R. Petrin, Robert K. Sander, Robert J. Romero, Michael C. Whitehead, Charles Robert Quick Jr., Joseph J. Tiee, and L. John Jolin "Spectroscopic analysis of infrared DIAL measurements", Proc. SPIE 2702, Gas and Chemical Lasers, (29 March 1996); https://doi.org/10.1117/12.236875

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