Applications of a compact mirage (PTD) based setup for trace gas detection in real time
in situ environmental monitoring and chemical analysis, B. Zimering and A.C. Boccara,
to be published in Appl. Opt.
We present the application of a compact setup for real time in situ trace gas detection
based on photothermal beam deflection (mirage effect) spectroscopy to environmental monitoring
and chemical analysis. The setup provides many advantages for local (non-remote) detection
applications, such as rapid response and very high sensitivity under true in situ conditions.
The detection limit of C2H4 in open air is estimated to be 0.25 ppb, based on concentration
calibration with the dominant noise due to atmospheric turbulence, on a time scale of 1 second.
Detection limits are extrapolated for other species, and applications are explored by real time
measurements of gas emissions from a variety of solid and semisolid samples.
email : zimbob@moka.ccr.jussieu.fr
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