Preliminary measurements of the Brillouin scattering as a function of salinity and temperature using an etalon as the frequency analysing tool have been successfully performed. These measurements were performed using the bulk Nd:YAG system at Texas A&M as well as the fiber amplifier at TU Darmstadt.
Using the bulk Nd:YAG system we analyzed the linewidth of the Brillouin scattered contributions as a function of temperature and salinity. A prototype sensor in the laboratory has been set up and is calibrated using iodine transitions as molecular edge filters.
Using our fiber amplifier and a Fabry-Perot etalon we have measured Brilloiun spectra as a function of temperature and have, for the first time, measured a temperature profile in the laboratory using our test setup, which consists of two chambers mounted horizontally and held at different temperatures.
In the next step we have combined our ESFADOF setup as receiver with the fiber amplifier. We were able to detect a temperature profile in our test setup using this system.
The next steps are:
- increasing the sensitivity of the system
- ruggedize the laser setup
- field test
Within the Graduiertenkolleg 1114, funded by the DFG we are working towards a system enabling a first field test:
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Prof. Dr. Thomas Walther
Laser und Quantenoptik
Institut für Angewandte Physik
Fachbereich 05 - Physik
Technische Universität Darmstadt
Schlossgartenstr. 7
D-64289 Darmstadt
+49 6151 16-20831 (Sekretariat)
+49 6151 16-20834 (Fax)
Thomas.Walther@physik.tu-...
03.04.19