EXPERIMENTAL EQUIPMENT Sample Clauses

EXPERIMENTAL EQUIPMENT. During the ACOBAR Experiment, active acoustic sources and other oceanographic equipment were deployed in Fram Strait. No “experimental” acoustic sources were deployed. All sources are commercially available. The RV and OPV are outfitted with hull-mounted standard active transducers, including echosounders and depth sounders. Additionally, the ACOBAR project scientists used a variety of standard commercial off-the-shelf (COTS) instruments, such as Acoustic Doppler Current Profiler (ADCP) and acoustic modems (Table 1-3). Since these acoustic instruments were unmodified and were used for their intended function, they were not included in the acoustical analysis in this EAR. Additional non- acoustic, standard oceanographic equipment, such as conductivity, temperature, and depth (CTD) instruments, were also deployed to measure other parameters of the physical oceanic environment during the experiment. The WRC moored tomography sound source (Figure 1-2), which was used to generate the tomographic and RAFOS signals, is a swept frequency underwater acoustic projector that is not gas-compensated, with 50% efficiency, and a directivity index (DI) of 3 decibels (dB) in the horizontal direction (Table 1-2). The WRC projector is a micro-tunable organ pipe with a symmetrical Tonpliz transducer. The unit is free-flooded, with a 36 centimeter (cm) (14 in) diameter. Its controller is a 32-bit Motorola MC68CK338 micro-controller, programmable via external SAIL connector, integrated with a 4-channel STAR system (Scripps Institution of Oceanography), with a hybrid Rubidium low-power clock and underwater acoustic navigation. Long-term stability is estimated to be 3 msec for one year. Power is generated from standard alkaline Figure 1-2. WRC acoustic source to be deployed during the ACOBAR Experiment. “D” cell batteries. Endurance is estimated to be up to 3,000 acoustic transmissions, and maximum operating depth is 6,000 m for the electronic housing. The WRC projector is built from aluminum 6061-T6, end-caps are hard anodized, and weight in air is 1,000 kilograms (kg). A WRC source was located at 420 m (Mooring A), 515 m (Mooring B), and 559 m (Mooring C) on the mooring string at each corner of the experimental area (Figure 1-3). The WRC sources transmitted tomographic signals (row 1 of Table 1-2) and RAFOS signals (row 2 of Table 1-2). A vertical line array of STAR (Figures 1-4 and 1-5), developed by Scripps Institution of Oceanography (SIO), was deployed and moored roughly in...