||Laser-Based, Long Path Monitoring of Ambient Gases, Analysis of Two Systems.
McClenny, William A. ;
Russwurm, George M. ;
||Environmental Sciences Research Lab., Research Triangle Park, NC. ;Northrop Services, Inc., Research Triangle Park, NC.
Air pollution ;
Carbon monoxide ;
Gas analysis ;
Semiconductor lasers ;
Carbon dioxide lasers ;
Performance evaluation ;
Laboratory equipment ;
Chemical analysis ;
Long path optical measurements ;
||Some EPA libraries have a fiche copy filed under the call number shown.
New long path absorption techniques for measurement of ambient O3 and CO have recently been demonstrated using a CO2 laser and a semiconductor diode laser, respectively. For the CO2 laser system the use of closely spaced wavelengths minimizes system drift and simplifies the determination of ambient O3 concentrations. For the diode laser system, multimoding of commercially available diodes can cause a nonlinear response and frequency detuning can occur unless a proper feedback network is provided. Area monitoring, monitoring along boundaries in regional air pollution studies and model validation are potential applications. (Copyright (c) Pergamon Press Ltd. 1978.)