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@ARTICLE{Ttrai:155471,
      author       = {Tátrai, D. and Bozóki, Z. and Smit, H. and Rolf, C. and
                      Spelten, N. and Krämer, Martina and Filges, A. and Gerbig,
                      C. and Gulyás, G. and Szabó, G.},
      title        = {{D}ual channel photoacoustic hygrometer for airborne
                      measurements: background, calibration, laboratory and
                      in-flight inter-comparison tests},
      journal      = {Atmospheric measurement techniques discussions},
      volume       = {7},
      number       = {6},
      issn         = {1867-8610},
      address      = {Katlenburg-Lindau},
      publisher    = {Copernicus},
      reportid     = {FZJ-2014-04637},
      pages        = {6359 - 6384},
      year         = {2014},
      abstract     = {This paper describes a tunable diode laser based dual
                      channel photoacoustic (PA) humidity measuring system called
                      WaSul-Hygro primarily designed for aircraft based
                      environment research. It is calibrated for total pressures
                      and water vapor (WV) volume mixing ratios (VMRs) possible
                      during airborne applications. WV VMR is calculated by using
                      pressure dependent calibration curves and a cubic spline
                      interpolation method. Coverage of the entire atmospheric
                      humidity concentration range which might be encountered
                      during airborne measurements is facilitated by applying an
                      automated sensitivity mode switching algorithm. The
                      calibrated PA system was validated through laboratory and
                      airborne inter-comparisons, which proved that the
                      repeatability, the estimated accuracy and the response time
                      of the system is 0.5 ppmV or $0.5\%$ of the actual reading
                      (whichever value is the greater), $5\%$ of the actual
                      reading within the VMR range of 1–12 000 ppmV and 2 s,
                      respectively. The upper detection limit of the system is
                      about 85 000 ppmV, limited only by condensation of water
                      vapor on the walls of the 318 K heated PA cells and inlet
                      lines. The unique advantage of the presented system is its
                      applicability for simultaneous water vapor and total water
                      volume mixing ratio measurements.},
      cin          = {IEK-8 / IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013 / I:(DE-Juel1)IEK-7-20101013},
      pnm          = {234 - Composition and Dynamics of the Upper Troposphere and
                      Stratosphere (POF2-234) / 233 - Trace gas and aerosol
                      processes in the troposphere (POF2-233)},
      pid          = {G:(DE-HGF)POF2-234 / G:(DE-HGF)POF2-233},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/amtd-7-6359-2014},
      url          = {https://juser.fz-juelich.de/record/155471},
}