Acceleration-insensitive hydrophone

Communications: electrical – Selective – Interrogation response

Patent

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Details

310 84, 340 8R, H04B 1300

Patent

active

040178242

ABSTRACT:
A hydrophone configuration provides compensation for longitudinal accelerations by placing two essentially identical solid ceramic piezoelectric elements back-to-back against a centrally located bulkhead in a strong cylindrical metal housing. The opposite ends of the elements are bonded to end caps which are mechanically sealed to the inside walls of the housing. The inside walls are spaced from the elements to allow any radial expansion or contraction of the elements to take place into an air chamber which is effectively isolated from the input to the hydrophone which is axial against the outside surfaces of the end caps. In a second embodiment two pairs of parallel-connected piezoelectric elements are included for a higher capacitance.

REFERENCES:
patent: 2788454 (1957-04-01), Zapponi
patent: 2945208 (1960-07-01), Samsel
patent: 2961637 (1960-11-01), Camp
patent: 3025359 (1962-03-01), Schilling et al.
patent: 3187300 (1965-06-01), Brate
patent: 3255431 (1966-06-01), Howatt
patent: 3311873 (1967-03-01), Schloss
patent: 3716828 (1973-02-01), Massa
patent: 3832762 (1974-09-01), Johnston

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