caa a22 4500 445369272 CHVBK 20180317142941.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00340-011-4643-8 doi (NATIONALLICENCE)springer-10.1007/s00340-011-4643-8 Tunable diode laser absorption sensor for the simultaneous measurement of water film thickness, liquid- and vapor-phase temperature [Elektronische Daten] [H. Yang, D. Greszik, I. Wlokas, T. Dreier, C. Schulz] A four-wavelength near-infrared (NIR) tunable diode laser sensor has been developed for the simultaneous measurement of liquid water film thickness, liquid-phase temperature and vapor-phase temperature above the film. This work is an important improvement of a three-wavelength concept previously introduced by Yang etal. (Appl. Phys. B 99:385, 2010), which measured the film thickness in environments with known temperature only. In the new sensor, an optimized combination of four wavelengths is chosen based on a sensitivity analysis with regard to the temperature dependence of the liquid water absorption cross section around 1.4μm. The temperature of liquid water and the film thickness are calculated from absorbance ratios taken at three wavelength positions assessing the broad-band spectral signature of liquid water. The vapor-phase temperature is determined from the absorbance ratio of two lasers rapidly tuned across two narrow-band gas-phase water absorption transitions. The performance of the sensor was demonstrated in a calibration cell providing liquid layers of variable thickness and temperature with uncertainties smaller than 5% for thickness measurements and 1.5% for liquid-phase temperatures, respectively. Experiments are also presented for time-resolved thickness and temperature measurements of evaporating water films on a quartz plate. Springer-Verlag, 2011 Yang H. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut Greszik D. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut Wlokas I. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut Dreier T. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut Schulz C. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut Applied Physics B Springer-Verlag 104/1(2011-07-01), 21-27 0946-2171 104:1<21 2011 104 340 https://doi.org/10.1007/s00340-011-4643-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00340-011-4643-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang H. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut NATIONALLICENCE 700 1- Greszik D. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut NATIONALLICENCE 700 1- Wlokas I. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut NATIONALLICENCE 700 1- Dreier T. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut NATIONALLICENCE 700 1- Schulz C. IVG, Universität Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany aut NATIONALLICENCE 773 0- Applied Physics B Springer-Verlag 104/1(2011-07-01), 21-27 0946-2171 104:1<21 2011 104 340 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer