Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics V

Q 62.91: Poster

Thursday, March 8, 2018, 16:15–18:15, Redoutensaal

Brillouin and Raman Measurements of Water for Temperature and Salinity Prediction — •Erik Fitzke, Andreas Zipf, David Rupp, and Thomas Walther — TU Darmstadt, Institute of Applied Physics, 64289 Darmstadt

We are working on a LIDAR system for airborne measurements of ocean temperature and salinity. Our goal is to provide oceanographers, marine biologists and meteorologists with a cost-efficient and flexible measurement system capable of depth-resolved acquisition of both parameters in the mixing layer of water down to 100 m depth. We present our recent progress in methods based on Brillouin and Raman scattering.

We continued out preceding work using the Brillouin approach which relies on the analysis of the Brillouin peak shift and peak width for simultaneous measurement of both temperature and salinity. New results for empirical relationships between the variables of interest and the Brillouin peak width will be presented.

As a complementary approach we analyzed the Raman scattering spectrum. By using Partial Least Squares Regression and Artificial Neural Networks we were able to determine temperature and salinity from the spectrum. We will present an overview of the methodology and results for the prediction accuracy of both parameters for the simultaneous analysis of the Raman spectrum.