@article {friedl2015,
	title = {Optical sensing of oxygen using a modified Stern-Volmer equation for high laser irradiance},
	journal = {Sensors and Actuators B: Chemical},
	volume = {206},
	year = {2015},
	note = {Available online 30 September 2014},
	pages = {336--342},
	doi = {10.1016/j.snb.2014.09.073},
	author = {Felix Friedl and Nils Krah and Bernd J{\"a}hne}
}
@article {friedl2015,
	title = {Optical sensing of oxygen using a modified Stern-Volmer equation for high laser irradiance},
	journal = {Sensors and Actuators B: Chemical},
	volume = {206},
	year = {2015},
	pages = {336{\textendash}342},
	doi = {10.1016/j.snb.2014.09.073},
	author = {Felix Friedl and Nils Krah and Bernd J{\"a}hne}
}
@phdthesis {friedl2013,
	title = {Investigating the Transfer of Oxygen at the Wavy Air-Water Interface under Wind-Induced Turbulence},
	volume = {Dissertation},
	year = {2013},
	publisher = {Institut f{\"u}r Umweltphysik, Fakult{\"a}t f{\"u}r Physik und Astronomie, Univ.\ Heidelberg},
	abstract = {Local oxygen (O2) transfer velocities measured in a linear wind-wave tunnel with respect to wind speed and fetch are presented in this thesis. For this, a non-intrusive laser-induced fluorescence (LIF) method was developed to measure vertical O2 concentration profiles in the water-sided mass boundary layer. The fluorophore used is a water soluble ruthenium complex, which is quenched according to the Stern-Volmer equation. This equation, which originally describes the quenching only for a weak excitation, was generalized for arbitrary laser irradiance. Measurements confirm this generalization and yield a new value for the Stern-Volmer constant. The LIF method was applied with high spatial and temporal resolution of 6.2 {\textmu}m m and 1.2 kHz, respectively, in order to resolve the mass boundary layer and fast processes. To obtain mean O2 concentration profiles with high precision, an algorithm was developed to detect the water surface in the recorded images. The measured mean concentration profiles show a transition in the self-similar shape with the onset of waves. The results for a flat water surface are in agreement with the surface renewal model. For a wavy water surface, the small eddy model and the surface renewal model both describe the data equally well. Vanishing O2 concentration fluctuations at the flat water surface were measured, which is in agreement with existing models for a rigid interface. The local transfer velocities obtained from mean concentration profiles are best parametrized with the friction velocity. In this work, the great potential of LIF measurements to probe transfer velocities locally is demonstrated.},
	url = {http://www.ub.uni-heidelberg.de/archiv/14582},
	author = {Felix Friedl}
}
@conference {friedl_2011,
	title = {Hochaufl{\"o}sende raumzeitliche Messung von fl{\"u}ssigkeitsseitigen Konzentrationsfeldern an der wind- und wellenbewegten Wasseroberfl{\"a}che},
	booktitle = {DPG Fr{\"u}hjahrstagung Dresden},
	year = {2011},
	abstract = {Konzentrationsprofile in der 20 bis 200 {\textmu}m dicken Massengrenzschicht innerhalb der wasserseitigen viskosen Grenzschicht an einer wind- und wellenbewegten, freien Wasseroberfl{\"a}che konnten bisher nicht gemessen werden. Alle bisherigen Messungen wurden an ebenen Wasseroberfl{\"a}chen in Tanks mit bodeninduzierter Turbulenz durchgef{\"u}hrt. Die erstmalige Messung vertikaler Konzentrationsprofile mit einer Aufl{\"o}sung von 11.4 {\textmu}m und einer Bildfrequenz von 973 Hz ist durch Verwendung der Laser induzierten Phosphoreszenz gelungen. Der dabei verwendete Farbstoff ist ein neuer, lichtempfindlicher Ruthenium Komplex, dessen Quenchkonstante den 17-fachen Wert im Vergleich zu der bisher benutzen Pyrenbutters{\"a}ure (PBA) besitzt. Zur Anregung der Phosphoreszenz wird ein auf unter 150 {\textmu}m fokussierter Laser mit einer Wellenl{\"a}nge von 445nm verwendet. Der Scheimpflugaufbau mit schr{\"a}gen Kanalw{\"a}nden des linearen Wind-Wellen-Kanals erm{\"o}glicht die Beobachtung wasserseitiger Konzentrationsprofile auch bei wellenbewegter Wasseroberfl{\"a}che. Im n{\"a}chsten Schritt werden zeitaufgel{\"o}ste, zweidimensionale Konzentrationsfelder quer zur Windrichtung aufgenommen. Erste Tests zeigen vielversprechende Ergebnisse.},
	url = {http://www.dpg-verhandlungen.de/year/2011/conference/dresden/part/up/session/5/contribution/3},
	author = {Felix Friedl and Alexandra G. Herzog and Pius Warken and Bernd J{\"a}hne}
}
@conference {herzog2010c,
	title = {Estimating water-sided vertical gas concentration profiles by inverse modeling},
	booktitle = {2nd Int. Conf. Eng. Optimization, Lisbon, 6--9. Sep. 2010},
	year = {2010},
	author = {Alexandra G. Herzog and T. Binder and Felix Friedl and Bernd J{\"a}hne}
}
@conference {herzog2010a,
	title = {Simultaneous high-resolution LIF measurements of dissolved gas concentration fields and measurements of wave slope at a wavy free water surface with wind-induced turbulence},
	booktitle = {15h Int. Symp on Appl. Laser Techniques to Fluid Mechanics, Lisbon, Portugal, July 05--08, 2010},
	year = {2010},
	doi = {10.5281/zenodo.15132},
	author = {Alexandra G. Herzog and Felix Friedl and Bernd J{\"a}hne}
}
@conference {herzog2010,
	title = {Spatio-temporal fluctuations of water-sided gas concentration fields under wind-induced turbulence},
	booktitle = {6th Int. Symp. Gas Transfer at Water Surfaces, Kyoto, May 17--21, 2010},
	year = {2010},
	note = {abstract},
	doi = {10.5281/zenodo.14929},
	author = {Alexandra G. Herzog and Felix Friedl and Bernd J{\"a}hne}
}
