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Optical Engineering

Laboratory demonstration of a Brillouin lidar to remotely measure temperature profiles of the ocean
Author(s): Andreas Rudolf; Thomas Walther
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Paper Abstract

We report on the successful laboratory demonstration of a real-time lidar system to remotely measure temperature profiles in water. In the near future, it is intended to be operated from a mobile platform, e.g., a helicopter or vessel, in order to precisely determine the temperature of the surface mixed layer of the ocean with high spatial resolution. The working principle relies on the active generation and detection of spontaneous Brillouin scattering. The light source consists of a frequency-doubled fiber-amplified external cavity diode laser and provides high-energy, Fourier transform–limited laser pulses in the green spectral range. The detector is based on an atomic edge filter and allows the challenging extraction of the temperature information from the Brillouin scattered light. In the lab environment, depending on the amount of averaging, water temperatures were resolved with a mean accuracy of up to 0.07°C and a spatial resolution of 1 m, proving the feasibility and the large potential of the overall system.

Paper Details

Date Published: 27 January 2014
PDF: 10 pages
Opt. Eng. 53(5) 051407 doi: 10.1117/1.OE.53.5.051407
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Andreas Rudolf, Technische Univ. Darmstadt (Germany)
Thomas Walther, Technische Univ. Darmstadt (Germany)

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