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<title>Diode laser spectroscopy for on-line chemical analysis</title>
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1992
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EngineeringLaser ScienceAtomic Emission SpectroscopyLaser ApplicationsFree Radical CharacterizationChemistrySpectrochemical AnalysisOptical DiagnosticsAnalytical ChemistryLaser-based SensorOptical SpectroscopyExceptional SensitivityLaser SpectroscopyOptical SensorsLaser PhotochemistryNatural SciencesSpectroscopyGas LasersDiode Laser Spectroscopy
Diode laser spectroscopy provides exceptional sensitivity and selectivity for real-time characterization of reacting systems and gas streams. High frequency wavelength modulation techniques achieve species detection limits that are routinely in the ppm range and can reach sub-ppb levels under favorable conditions. Narrow laser linewidths guarantee selective detection of key species even in the presence of myriad other components. Diode laser spectroscopy is also relatively immune from interference by black body radiation or chemiluminescence. Prototype diode-laser based systems have been demonstrated successfully for trace gas detection in turbulent, high temperature particle-laden streams, for oxygen quantitation in flames, for free radical characterization in a plasma etching reactor and for greenhouse gas flux measurements in air. We also discuss the availability of laser wavelengths, compatibility with fiber optics, cost safety and expectations for new laser development.© (1992) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.