Enhancement of the Sediment Acoustic-speed Measurement System (SAMS)
Abstract
This proposal is to improve the Sediment Acoustic-speed Measurement System (SAMS) built by the Applied Physics Laboratory, University of Washington with previous ONR funding. The existing SAMS is configured to measure sound speed and attenuation of surficial sediments (upper 3 meters) in the frequency band 1.5 - 50 kHz. SAMS currently has two drill systems: one using suction and the other with water jet. This proposal will (1) extend the system to make measurements at lower frequencies, where dispersion is of particular importance , and (2) add spare parts of the crucial components of the system in case of unexpected damage in the field. To extend the operational frequency band, a low-frequency source, manufactured by Engineering Acoustics Inc., is proposed, operating in the 400 -1600 Hz range. The projector comprises a number of flexural bar transducer elements in a compact cylindrical array with dimensions of 6" diameter x 48" length. To incorporate the low frequency source into the system, a U-shaped bracket would be built at the end of the extension arm to support the low-frequency source, which would be protected by two aluminum plates on the side from impact with the bottom during deployment and recovery. It is also proposed to acquire two spare probes, one for each drill system, in the event of unexpected damage during field work.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 12, 2016
- Source ID
- N000141512808
Entities
People
- Jie Yang
Organizations
- Office of Naval Research
- United States Navy
- University of Washington