Evaluation of Electromagnetic Source for Ocean Climate Acoustic Thermometry at Lake Seneca
2007
Slavinsky, Mark | Bogolubov, Boris | Alelekov, Igor | Pigalov, Konstantin | Spiesberger, John L.
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.
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