Title :
Tonpilz piezoelectric transducers with acoustic matching plates for underwater color image transmission
Author :
Inoue, Takeshi ; Nada, Takatoshi ; Tsuchiya, Toshio ; Nakanishi, Toshiyuki ; Miyama, Tetsuo ; Konno, Masashi
Author_Institution :
NEC Corp., Kawasaki, Japan
fDate :
3/1/1993 12:00:00 AM
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.<>
Keywords :
acoustic arrays; acoustic impedance; colour; oceanographic equipment; piezoelectric transducers; ultrasonic transducers; underwater sound; 24 kHz; 3500 m; Tonpilz piezoelectric transducers; US transducers; acoustic matching plates; color image acoustic transmission; design method; field test; high-power transmitting capability; multiple-mode filter synthesis theory; optimum specific acoustic impedances; underwater color image transmission; wideband low-ripple characteristics; Acoustic applications; Acoustic transducers; Ceramics; Color; Design methodology; Piezoelectric transducers; Sea surface; Surface impedance; Underwater acoustics; Wideband;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
