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| Titel |
A new airborne laser-induced fluorescence instrument for in situ detection of formaldehyde throughout the troposphere and lower stratosphere |
| VerfasserIn |
M. Cazorla, G. M. Wolfe, S. A. Bailey, A. K. Swanson, H. L. Arkinson, T. F. Hanisco |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-03), S.541-552 |
| Datensatznummer |
250116119
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| Publikation (Nr.) |
 copernicus.org/amt-8-541-2015.pdf |
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| Zusammenfassung |
| The NASA In Situ Airborne Formaldehyde (ISAF) instrument is a
high-performance laser-based detector for gas-phase formaldehyde (HCHO). ISAF
uses rotational-state specific laser excitation at 353 nm for laser-induced
fluorescence (LIF) detection of HCHO. A number of features make ISAF ideal
for airborne deployment, including (1) a compact, low-maintenance fiber
laser, (2) a single-pass design for stable signal response, (3) a
straightforward inlet design, and (4) a stand-alone data acquisition system. A
full description of the instrument design is given, along with detailed
performance characteristics. The accuracy of reported mixing ratios is
±10% based on calibration against IR and UV absorption of a primary
HCHO standard. Precision at 1 Hz is typically better than 20% above
100 pptv, with uncertainty in the signal background contributing most to
variability at low mixing ratios. The 1 Hz detection limit for a
signal / noise ratio of 2 is 36 pptv for 10 mW of laser power, and the
e fold time response at typical sample flow rates is 0.19 s. ISAF has
already flown on several field missions and platforms with excellent results. |
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