LIDAR, Remote Sensing of Sound Velocity in the Ocean.
1997
Fry, Edward S.
The project is progressing very well, and the first sound-velocity measurement using our non-scanning technique should be performed by summer 1997. No major problems have been encountered during the first year of this project. Several improvements of the experimental set up, and new possibilities are being considered: (1) Faraday Anomalous Dispersion Optical Filters(FADOF) using an excited state of Potassium could be also used as edges filters and their use is under study. It will have the advantage of rejecting background noise and having a very high transmission. (2) The width of the Brillouin lines is due to acoustic damping (absorption). By measuring this linewidth we can obtain data on the loss mechanisms - specifically bulk viscosity and shear viscosity. There is presently no experimental data for water on the former. An experimental set up similar to the one for Brillouin frequency shift measurement could serve this measurement.
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