Underwater Holographic Measurement of Mutual Coupling Effects in Sonar Transducer Arrays
NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT
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The principles of holographic interferometry, which have been widely used for measurements of structures vibrating in air, have been applied to the measurement of sonar transducer arrays operating underwater. This report summarizes the progress to date in the Laboratorys program to make holographic interferometry measurements of the mutual coupling effects between elements in a sonar transducer array operating in a free-field environment. It has been tentatively concluded that it is technically feasible to make underwater holographic measurements of transducer arrays, and that such measurements would represent a significant advance in the state of the art in transducer measurement technology.
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