Details for A re-examination of the Brillouin scattering LIDAR pier demonstration: new insights (maritime testing and validation for vertically profiling sound speed, temperature and underwater targets)

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Name:A re-examination of the Brillouin scattering LIDAR pier demonstration: new insights (maritime testing and validation for vertically profiling sound speed, temperature and underwater targets)
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A re-examination of the Brillouin scattering LIDAR pier demonstration: new insights (maritime testing and validation for vertically profiling sound speed, temperature and underwater targets). Trees, Charles; Fournier, Georges; Rupp, David; Friman, Sonja; Walther, Thomas. CMRE-MR-2017-004. June 2017.

Battlespace characterization of maritime domains, within the objectives of ISR (Intelligence, Surveillance, and Reconnaissance) requires the observation, analysis, and prediction of environments, including natural and contextual underwater and surface parameters that may have an impact on on-going and/or planned missions. One of the aims of project SAC000711 (Sensing Underwater Acoustic Pressure through Brillouin LIDAR Scattering) is to investigate the potential use of LASER and LiDAR technology to remotely sense underwater ocean-acoustic properties. This report describes the work done to evaluate the potential use of Brillouin Scattering LiDAR to measure temperature and sound speed in the water column, by exploring a data set collected during a pier experiment conducted at CMRE. The investigation of the Brillouin Scattering LIDAR phenomena from CMRE?s pier sent a pulsing laser beam (500µJ pulse-1, 10nsec duration and at 1kHz repetition rate, wavelength of 543.3 nm) into the water. It was selected to also study and provide exploratory work on the optical-acoustic relationships that exists as the laser pulse travels through the water column. A transmitting and receiving system (acoustic modem) was also deployed in the general area of the Pier Demo to evaluate the potential for the BSL to provide both an acoustic source and a receiver as well as the thermal expansion of the water column (optoacoustic) during these pulsed events, these studies will be used and discussed in future work. Results show that the early prototype system is capable to retrieve the physical parameters like water temperature and can also provide full light extinction estimates along the water column. Further exploitation of this technology will require the on-set of an improved system.

 
 
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Created On: 06/16/2017 12:49
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