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| Titel |
Analyzers for Ambient CH4, CO, and N2O Monitoring based on Mid-IR Difference Frequency Lasers |
| VerfasserIn |
H. J. Jost, J. J. Scherer, J. B. Paul, M. L. Fischer |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064901
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| Zusammenfassung |
| The new mid-infrared sensor platform Iris is described that combines difference frequency
generation (DFG)-based tunable laser sources with simple direct absorption spectroscopy.
The analyzers are capable of sub-ppb detection of key greenhouse gas species as well as
isotopologues of greenhouse gases and common pollutants.
DFG lasers operating in the 3-5 micron window are tuned to access a variety of species
and their isotopologues in the C-H, N-O, and C-O stretch region. Examples of analyzer data
obtained for methane, nitrous oxide, and carbon monoxide are presented, including
relevant time series data. Associated Allan Variances from laboratory experiments
demonstrating ppt-level precision and ppb-level accuracy with long calibration intervals
are also shown. Emphasis on achieving key performance metrics driven by WMO
guidelines for Global Atmospheric Watch (GAW) and other applications is highlighted.
Additionally, first results from field tests and initial field validations are described
demonstrating field performance comparable to that obtained in the laboratory. |
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