title: Tonpilz piezoelectric transducers with acoustic matching plates for underwater color image transmission.
abstract: Tonpilz piezoelectric transducers with multiple acoustic matching plates are suitable for color image acoustic transmission, to achieve wideband low-ripple characteristics as well as high-efficiency high-power transmitting capability. The design method for the transducers was investigated on the basis of multiple-mode filter synthesis theory. For transducers with single, double, and triple matching plates, optimum specific acoustic impedances and lengths were calculated. Moreover, based on this design method, a 24 kHz array comprising nine identical transducers with single matching plates was built and evaluated. As a result, this array showed high-efficiency, low-ripple, and wideband characteristics. Excellent agreement between theoretical values and experimental results was obtained. A field test was carried out on color image transmission from a 3500 m sea depth, using the fabricated array, during which good color images were received.
authors.affiliation: NEC Corp., Kawasaki.
authors.forename: T
authors.initials: T
authors.lastname: Inoue
authors.forename: T
authors.initials: T
authors.lastname: Nada
authors.forename: T
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: T
authors.initials: T
authors.lastname: Nakanishi
authors.forename: T
authors.initials: T
authors.lastname: Miyama
authors.forename: M
authors.initials: M
authors.lastname: Konno