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| Titel |
Technical Note: Calibration device for the krypton hygrometer KH20 |
| VerfasserIn |
T. Foken, H. Falke |
| 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. 8 ; Nr. 5, no. 8 (2012-08-01), S.1861-1867 |
| Datensatznummer |
250003043
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| Publikation (Nr.) |
 copernicus.org/amt-5-1861-2012.pdf |
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| Zusammenfassung |
| A calibration device for krypton hygrometers (KH20, Campbell Scientific,
Inc.) with variable path length is presented. This unit allows for in-situ
calibrations of the krypton hygrometer, which is typically not very stable
over time, during measuring campaigns. It was constructed mainly for
application at high altitudes and low temperatures, where further
improvements are needed to the IR-hygrometers which are normally used. The
changing path length requires that a changing concentration of the absorber
be simulated. Because oxygen absorbs more strongly than water vapour, the
calibration is made against oxygen and transferred to water vapour. The
design of the calibration instrument is made as one unit containing a
stepper motor system, PC and humidity sensor. For the calibration, it is
necessary to install the krypton hygrometer on this unit. |
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