NDLI: A Brillouin-lidar for remote sensing of the temperature profile in the ocean: Progress towards the implementation

Content Provider	IEEE Xplore Digital Library
Author	Rudolf, Andreas Walther, Thomas
Copyright Year	2011
Description	Author affiliation: Institute for Applied Physics, TU Darmstadt, Schlossgartenstr. 7, D-64289 Darmstadt, Germany (Rudolf, Andreas; Walther, Thomas)
Abstract	The knowledge of water temperature profiles of the upper-ocean mixed layer would provide valuable input to climate studies, weather forecasts and oceanography in general. Currently, their measurement is realized by in-situ techniques such as buoys, gliders and bathythermographs. In order to provide a more flexible and less cost-intensive method, a remote-sensing lidar technique is an attractive alternative. Guagliardo et al. proposed Brillouin scattering as a potential temperature tracer already in 1980. Due to recent progress in laser technology, the implementation is now possible. The Brillouin lidar we are developing consists of two main components: The light source is a pulsed, three stage Yb-doped fiber amplifier with subsequent frequency doubling. The measurement of the Brillouin shift is performed by a spectrally highly resolving atomic edge-filter in the form of an excited state Faraday anomalous dispersion optical filter (ESFADOF). Both components are intrinsically insensitive to vibrations and exhibit low power consumption, making them perfectly suited for the operation from a mobile platform. Combining the fiber amplifier with a scanning interferometer, we succeeded in performing first range resolved water temperature measurements in our laboratory setup. Concerning the ESFADOF detector, we recently improved the transmission characteristics considerably. It now provides steep transmission edges with a maximum transmission of 57%. In the near future, we plan to demonstrate the successful interplay of the ESFADOF with the fiber amplifier under laboratory conditions.
Starting Page	1
Ending Page	7
File Size	73513
Page Count	7
File Format	PDF
ISBN	9781457700866
e-ISBN	9781457700880
DOI	10.1109/Oceans-Spain.2011.6003502
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-06
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical fiber amplifiers Ocean temperature Temperature measurement Optical fiber dispersion Temperature sensors Sea measurements
Content Type	Text
Resource Type	Article

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