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Comparison of Lyman-alpha and LI-COR infrared hygrometers for airborne measurement of turbulent fluctuations of water vapour

GND
1162287381
Affiliation
Institute of Flight Guidance, TU Braunschweig
Lampert, Astrid; Hartmann, Jörg;
GND
116229485X
Affiliation
Institute of Flight Guidance, TU Braunschweig
Pätzold, Falk;
GND
1162465662
Affiliation
Institute of Flight Guidance, TU Braunschweig
Lobitz, Lennart;
ORCID
0000-0002-8807-6856
Affiliation
Institute of Flight Guidance, TU Braunschweig
Hecker, Peter; Kohnert, Katrin; Larmanou, Eric; Serafimovich, Andrei;
GND
1162465891
Affiliation
Institute of Flight Guidance, TU Braunschweig
Sachs, Torsten

To investigate if the LI-COR humidity sensor can be used as a replacement of the Lyman-alpha sensor for airborne applications, the measurement data of the Lyman-alpha and several LI-COR sensors are analysed in direct intercomparison flights on different airborne platforms. One vibration isolated closed-path and two non-isolated open-path LI-COR sensors were installed on a Dornier 128 twin engine turbo-prop aircraft. The closed-path sensor provided absolute values and fluctuations of the water vapour mixing ratio in good agreement with the Lyman-alpha. The signals of the two open-path sensors showed considerable high-frequency noise, and the absolute value of the mixing ratio was observed to drift with time in this vibrational environment. On the helicopter-towed sensor system Helipod, with very low vibration levels, the open-path LI-COR sensor agreed very well with the Lyman-alpha sensor over the entire frequency range up to 3 Hz. The results show that the LI-COR sensors are well suited for airborne measurements of humidity fluctuations, provided that a vibrationless environment is given, and this turns out to be more important than close sensor spacing.

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