Evaluation of Electromagnetic Source for Ocean Climate Acoustic Thermometry at Lake Seneca
WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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A compact electromagnetic monopole source, requiring pressure equalization, was evaluated. The titanium source was developed at the IAP RAS. The source has a mass of 123 kg and a diameter of 0.54 m. The source cannot be thought of as a single unit rather the characterisitics of the transmitted signal depend on a transmission system consisting of the source, the power amplifier, and a computer. The computer and the amplifier send specially adapted signals to the source to produce the desired signals. Measurements indicate the acoustic system has a center frequency of 225 Hz, a bandwidth of about 50 Hz, and associated pulse resolution of about 0.02 s, a source level of about 198 dB re 1 microPa 1 m, with an efficiency of about 50. The system has an efficiency of about 67 near 225 Hz, the resonant frequency. The source is suitable for mounting on autonomous ocean moorings for several years as part of a system of monitoring climatic temperature changes over basin scales.
- Acoustic Detection and Detectors
- Electricity and Magnetism