In large scale monitoring techniques of the ocean such as ocean acoustic tomography, a wide band low frequency sound source is required. In this paper, a new type of construction of a low frequency sound source in which the cylindrical transducer is put between two metal circular plates is proposed. This source has wide band resonance and high reliability at high power operation. The source characteristics of resonance frequency and quality factor Q are examined using a theoretical model. Experimental results are compared with theoretical results, and this low frequency sound source is found to be valid in deep seas.
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