In-situ techniques available on the aircraft for measuring gaseous water content in the atmosphere

TDL absorption technique using a single wavelength at 1.37µm and a 24 cm path length with 2nd harmonic detection. Operated by FAAM as a core instrument following WG recommendation in 2017.

FAAM CORE Buck CR2 Chilled Mirror Hygrometer

FAAM CORE Measures the total water (i.e. liquid plus vapour) in the atmosphere at 64Hz using a Lyman-Alpha absorption hygrometer developed by the Met Office.

FAAM CORE General Eastern GE 1011B Chilled Mirror Hygrometer