Laboratory development of a lidar for measurement of sound velocity in the ocean using Brillouin scattering

Yves Emery; Edward S. Fry

doi:10.1117/12.266444

6 February 1997 Laboratory development of a lidar for measurement of sound velocity in the ocean using Brillouin scattering

Yves Emery, Edward S. Fry

Author Affiliations +

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266444
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

There have been several studies of the potential accuracy of LIDAR measurements of sound velocity in the ocean by measuring the spectral shift of the backscattered Brillouin lines. However, due to technical limitations, such systems have not previously been experimentally demonstrated. Measurement of the Brillouin shift as a function of depth in the ocean requires a stabilized, narrow linewidth, pulsed laser, and a high-resolution spectroscopic technique. We have used a scanning Fabry-Perot to obtain the first frequency resolved measurements of Brillouin scattering in water using a pulsed laser; these results will be presented here. But for the practical application of measuring Brillouin shifts as a function of depth in the ocean a non- scanning spectroscopic technique is required to measure the small frequency shifts; the edge technique meets this requirement. Using it in conjunction with the edges of absorption lines in the molecular spectra of I₂ and/or Br₂, avoids the limitations associated with use of a Fabry-Perot etalon; specifically, its small solid angle of acceptance and its vulnerability in noisy environments. This new approach will be briefly described.

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Yves Emery and Edward S. Fry "Laboratory development of a lidar for measurement of sound velocity in the ocean using Brillouin scattering", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266444

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