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| Titel |
A fast and precise chemiluminescence ozone detector for eddy flux and airborne application |
| VerfasserIn |
A. Zahn, J. Weppner, H. Widmann, K. Schlote-Holubek, B. Burger, T. Kühner, H. Franke |
| 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 ; 5, no. 2 ; Nr. 5, no. 2 (2012-02-15), S.363-375 |
| Datensatznummer |
250002463
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| Publikation (Nr.) |
 copernicus.org/amt-5-363-2012.pdf |
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| Zusammenfassung |
| A commercially available dry chemiluminescence (CI) instrument for fast and
precise measurement of ozone (O3) is specified. The sensitivity is
~9000 counts s−1 per ppbv of ozone. Its precision is entirely
determined by the number of photons reaching the detector (being a
photomultiplier), i.e. is quantum-noise limited. The relative precision
(ΔO3/O3 in %) thus follows Poisson statistics and
scales with the square root of the measurement frequency f and with the
inverse O3 mixing ratio: ΔO3/O3 ∝ f0.5 · O3−0.5.
At typical O3 mixing ratios between
10 and 100 ppbv (and 1 bar), the precision is 0.3–1.0% at f = 10 Hz.
The maximum measurement frequency is 50 Hz. The mechanical and electronic
set-up as well as the instrument performance is described. Recommendations
on the adequate inlet tube configuration (inlet tube length, sampling flow)
and on the way of calibration at stationary ground-based platforms and
onboard aircraft are given. |
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