200-kHz Wide-Band Underwater Ultrasonic Transducers for Color Video Picture Transmission
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概要
- 論文の詳細を見る
Wide-band, low-ripple underwater transducers with high-power acoustic radiation capability have been designed on the basis of multiple-mode filter synthesis theory. They are composed of triple acoustic matching plates and double backing plates with optimized specific acoustic impedances, besides piezoelectric ceramic elements. One of the backing plates employs a Fe damping-alloy to suppress unwanted response peaks in the frequency range above the passband region. Two 3×3 array transducers were fabricated, each with a center frequency of 200kHz, one as a transmitter and the other as a receiver. The two transducers show high-sensitivity, low-ripple and wide-band transmitting and receiving responses. Then, the transducers were applied in a color video picture digital transmission system. Clear color video pictures, composed of 256× pixels, were successfully received within one second.
- 社団法人電子情報通信学会の論文
- 1994-07-25
著者
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Inoue Takeshi
Material Development Center, NEC Corporation
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WATARI Noriko
NEC Scientific Information Systems Development Co., Ltd.
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Watari N
Nec Informatics Systems Ltd. Kawasaki‐shi Jpn
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Suzuki Michiya
Radio Application Division Nec Corporation
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Kameyama Akira
Electronic Compornents Division Tokin Corporation
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Miyama T
Nec Corp. Fuchu‐shi Jpn
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Miyama Tetsuo
Radio Application Division, NEC Corporation
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Inoue Takeshi
Material Development Center Nec Corporation
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