Accession Number : ADA265054


Title :   Evaluation of Electromagnetic Source for Ocean Climate Acoustic Thermometry at Lake Seneca


Descriptive Note : Technical rept.


Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA


Personal Author(s) : Slavinsky, Mark ; Bogolubov, Boris ; Alelekov, Igor ; Pigalov, Konstantin ; Spiesberger, John L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265054.pdf


Report Date : Feb 1993


Pagination or Media Count : 49


Abstract : 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.


Descriptors :   *ATMOSPHERIC TEMPERATURE , *ACOUSTIC SIGNALS , *UNDERWATER ACOUSTICS , *ELECTROMAGNETS , FREQUENCY , USSR , HYDROSTATIC PRESSURE , ACOUSTIC VELOCITY , HYDROPHONES , POWER AMPLIFIERS , SOUND TRANSMISSION , OCEAN SURFACE


Subject Categories : Meteorology
      Acoustic Detection and Detectors
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE