Agency/Department

FLC Region

Security Lab

No

Address

4555 Overlook Avenue S.W.
Washington

(P)

202-767-3083

Description

FUNCTION: Flow visualization of fluid processes on the continental shelf; e.g., internal tides, ear instabilities, and nonlinear internal gravity waves (solitons).

DESCRIPTION: Our HFAFV sonar systems are used to image the fluid processes that perturb the density/sound speed field in the littoral. A patented high-speed transmit-receive switch provides NRL with the receive sensitivity necessary to detect the small-amplitude signals backscattered from particulates and temperature/salinity variability associated with large density gradients in the thermocline. At the laboratory, the data is processed and analyzed with the objective of improving our understanding of the generation and propagation of internal waves and fine structure and their effect on the sound speed field.

INSTRUMENTATION: Two similar systems, differing only in operating frequency:

(1) Matec PR5000 gated sine wave pulse generator and power amplifier, NRL-developed transmit-receive switch, custom-designed transducer (200 kHz)

(2) Matec PR5000 gated sine wave pulse generator and power amplifier, NRL-developed transmit-receive switch, custom-designed transducer (350 kHz)

Also, a personal computer-based data acquisition system, using off-the-shelf analog-to-digital converters and ISIS software from Triton Elics.

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