A wideband and high-efficiency underwater ultrasonic transducer, consisting of T-shaped piezoelectric ceramic resonator and a single acoustic matching plate, has been investigated. The transducer has been designed using a double mode filter synthesis theory, because it has two resonant modes, whose phases differ by pi from each other. The optimum specific acoustic impedance and length for the matching plate have been calculated. A 30 kHz oil-filled array, including four identical transducers supported at their vibrational nodes, has been fabricated on the basis of this theory, and their underwater acoustic characteristics evaluated. As a result, it has been confirmed that the array has the following characteristics: 33 % fractional 3 dB-bandwidth for transmitting voltage frequency response, 30 % fractional 3 dB-bandwidth for receiving voltage frequency response, 211.6 dB sound pressure level re 1 myPa at 1 meter, -177 dB receiving voltage sensitivity re 1 V/myPa and possible operating depth of over 3000 meters. Excellent agreement between theoretical values and experimental results has been obtained. It has been proved that this transducer is useful as a transducer with high resolution for deep oceans.
Wideband underwater transducer array with single acoustic matching plate
Unterwasser-Schallwandler fuer Breitbanduebertragung mit akustischer Anpassungsblende
NEC Research and Development ; 86 ; 29-36
1987
8 Seiten, 14 Bilder, 2 Tabellen, 21 Quellen
Article (Journal)
English
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