Trace gas monitoring with infrared laser-based detection schemes |
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Authors: | MW Sigrist R Bartlome D Marinov JM Rey DE Vogler H Wächter |
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Institution: | (1) Institute for Quantum Electronics, Laser Spectroscopy and Sensing Lab, ETH Zurich, Schafmattstrasse 16, 8093 Zürich, Switzerland |
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Abstract: | The success of laser-based trace gas sensing techniques crucially depends on the availability and performance of tunable laser
sources combined with appropriate detection schemes. Besides near-infrared diode lasers, continuously tunable midinfrared
quantum cascade lasers and nonlinear optical laser sources are preferentially employed today. Detection schemes are based
on sensitive absorption measurements and comprise direct absorption in multi-pass cells as well as photoacoustic and cavity
ringdown techniques in various configurations. We illustrate the performance of several systems implemented in our laboratory.
These include time-resolved multicomponent traffic emission measurements with a mobile CO2-laser photoacoustic system, a diode-laser based cavity ringdown device for measurements of impurities in industrial process
control, isotope ratio measurements with a difference frequency (DFG) laser source combined with balanced path length detection,
detection of methylamines for breath analysis with both a near-IR diode laser and a DFG source, and finally, acetone measurements
with a heatable multipass cell intended for vapor phase studies on doping agents in urine samples.
PACS 33.20.Ea; 42.62.Fi; 42.72.Ai; 87.64.km; 92.60.Sz |
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