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- W2073509661 abstract "A transmitting hydrophone which remotely senses both absolute pressure and changes in pressure has been developed using a surface-acoustic-wave (SAW) oscillator. This oscillator is formed by placing a SAW delay line or resonator in the feedback loop of an amplifier. The pressure applied to the hydrophone is converted to a flexural loading of the piezoelectric plate which alters the surface-wave velocity on the plate, consequently shifting the oscillator frequency. This frequency modulated signal is easily transmitted to a remote location for signal recovery. The piezoelectric plate thickness and length can be chosen to optimize the sensitivity of the SAW hydrophone. The surface-wave element of the oscillator is a planar structure; therefore, it is simple and inexpensive to manufacture. Furthermore, the size and power requirements of the SAW hydrophone are small, typically less than 50 cm3 a and 300 mW. This paper presents performance data of a number of SAW hydrophones using SAW oscillators in the 40–100-MHz range in conjunction with a versatile signal demodulation system. Extensive measurements of sensitivity and frequency response were made for both delay line and resonator hydrophones manufactured on LiNbO3 and S-T cut quartz substrates and compared with measurements obtained from conventional hydrophones in the identical setup. [Work supported by Naval Electronics Systems Command Contract No. N00039-78-C-0042.]" @default.
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- W2073509661 date "1978-11-01" @default.
- W2073509661 modified "2023-09-27" @default.
- W2073509661 title "Transmitting SAW hydrophone" @default.
- W2073509661 doi "https://doi.org/10.1121/1.2004492" @default.
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