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Title: Remote chemical sensing by laser optical pumping

Abstract

The authors are exploring a new approach to remote chemical identification that promises higher precision than can be achieved by conventional DIAL approaches. This technique also addresses and potentially solves the problem of detecting a target gas in the presence of an interfering gas or gases. This new approach utilizes an eye-safe infrared optical pumping pulse to deplete the population of a specific rotational level(s) and then sends probe pulses at the same or different wavelengths to interrogate the bleaching of the absorption. The authors have experimentally measured optical saturation fluence level at atmospheric pressure for HCL, and find this level to all be {approximately}1 mJ/cm{sup 2}, significantly below eye-safe limits in agreement with similar results. In the laboratory, using time delay replicated pulses at a single frequency the authors have made absorption measurements with precision levels routinely approaching 0.1% on averaging 200 laser pulses. These results as well as those of two other pulse experiments will be presented.

Authors:
;  [1]
  1. Lawrence Livermore National Lab., CA (United States)
Publication Date:
OSTI Identifier:
492288
Report Number(s):
CONF-960848-
ISBN 0-8194-2221-5; TRN: IM9730%%167
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Denver `96: 1. conference on space processing of materials, at SPIE International Society for Optical Engineering (SPIE) annual international symposium on optical science, engineering, and instrumentation, Denver, CO (United States), 4-9 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Application of lidar to current atmospheric topics; Sedlacek, A.J. III [ed.] [Brookhaven National Lab., Upton, NY (United States). Dept. of Advanced Technology]; PB: 270 p.; SPIE proceedings series, Volume 2833
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR POLLUTION MONITORING; OPTICAL RADAR; OPTICAL PUMPING; LASERS; ABSORPTION SPECTRA; HYDROCHLORIC ACID; PERFORMANCE TESTING; HYDROFLUORIC ACID; NITRIC OXIDE; NITROGEN DIOXIDE

Citation Formats

Stevens, C G, and Magnotta, F. Remote chemical sensing by laser optical pumping. United States: N. p., 1996. Web.
Stevens, C G, & Magnotta, F. Remote chemical sensing by laser optical pumping. United States.
Stevens, C G, and Magnotta, F. 1996. "Remote chemical sensing by laser optical pumping". United States.
@article{osti_492288,
title = {Remote chemical sensing by laser optical pumping},
author = {Stevens, C G and Magnotta, F},
abstractNote = {The authors are exploring a new approach to remote chemical identification that promises higher precision than can be achieved by conventional DIAL approaches. This technique also addresses and potentially solves the problem of detecting a target gas in the presence of an interfering gas or gases. This new approach utilizes an eye-safe infrared optical pumping pulse to deplete the population of a specific rotational level(s) and then sends probe pulses at the same or different wavelengths to interrogate the bleaching of the absorption. The authors have experimentally measured optical saturation fluence level at atmospheric pressure for HCL, and find this level to all be {approximately}1 mJ/cm{sup 2}, significantly below eye-safe limits in agreement with similar results. In the laboratory, using time delay replicated pulses at a single frequency the authors have made absorption measurements with precision levels routinely approaching 0.1% on averaging 200 laser pulses. These results as well as those of two other pulse experiments will be presented.},
doi = {},
url = {https://www.osti.gov/biblio/492288}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}

Conference:
Other availability
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