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Proceedings Paper

Infrared laser spectroscopy for trace gas analysis
Author(s): Markus W. Sigrist; Markus Naegele; Albert Romann
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Paper Abstract

This paper discusses main aspects of trace gas sensing base don laser spectroscopic techniques. High detection sensitivities and selectivities are achieved by using tunable narrowband IR laser sources emitting preferentially in the mid-IR wavelength range. CO2 lasers, nonlinear optical devices such as optical parametric oscillators and difference frequency generation, as well as quantum cascade laser can be employed. Detection methods involve multipass transmission, intracavity absorption, photoacoustic and cavity ringdown schemes. The performance of various systems developed in our and other laboratories is illustrated with examples from different fields. Minimum detectable gas concentrations are at the ppb to sub-ppb level. Applications include fast analyses of multicomponent samples, field measurements in various environments as well as medical diagnostics.

Paper Details

Date Published: 14 August 2001
PDF: 4 pages
Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); doi: 10.1117/12.437224
Show Author Affiliations
Markus W. Sigrist, ETH Zurich (Switzerland)
Markus Naegele, ETH Zurich (Switzerland)
Albert Romann, ETH Zurich (Switzerland)


Published in SPIE Proceedings Vol. 4419:
4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications

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