Broad band, high frequency, high sensitivity beam forming array

Details Broad band, high frequency, high sensitivity beam forming array Broad band, high frequency, high sensitivity beam forming array

1994-08-15

1995-09-05

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367153, 367162, 367176, H04B 1300

Patent

active

H00014915

ABSTRACT:
A sonar array which is operable at a broad range of frequencies, has a high free-field voltage sensitivity and is operable at high hydrostatic pressures. The array includes sensor elements made of a piezoelectric material, a backing plate which supports the sensor elements, a dielectric-elastic insulator positioned between the sensor elements and the backing plate, and backing blocks corresponding, respectively, to the sensor elements, each backing block positioned between a corresponding sensor element and the insulator. The sensor elements are arranged in staves, the staves forming four separate quadrants, the sensor elements in each stave being arranged in parallel and series combinations, so that the sonar array is operable between a frequency range of 10 kHz to above 100 kHz, each stave has a free-field voltage sensitivity of -186 dB re 1V/.mu.Pa or greater between the frequency range and the free-field voltage sensitivity does not change more than plus or minus 2 dB at hydrostatic pressures varying from 20 to 4481.6 kPa.

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