Hydrophones and similar devices
First Claim
Patent Images
1. A direction finding, motion-sensitive transducer, comprising:
- (a) an inertial mass;
(b) means defining a mounting base;
(c) resilient means interconnecting said inertial mass with said mounting base, said inertial mass extending along a symmetry axis when at rest in a non-accelerated condition, and said resilient means being adapted to permit the inertial mass to wobble relative to the mounting base in radial directions relative to said symmetry axis in response to and in accordance with the direction of components of acceleration of the mounting base which are transverse to the symmetry axis;
(d) a plurality of sensing elements arranged to respond to the wobbling motion of the inertial mass relative to the mounting base, with said sensing elements being located so as to define multiple directional channels which are adapted to produce outputs dependent on the directions of said acceleration components, and wherein(e) said inertial mass, said resilient means and said sensing elements together define resonant systems, and damping means common to said inertial mass, said resilient means, said sensing elements and the multiple directional channels defined by the latter for controlling the resonance of said systems.
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Abstract
An accelerometer-based direction finding and ranging transducer such as a hydrophone uses piezoelectric ceramic as the active material. Orthogonally arranged accelerometers share an inertial mass and resonance control system and the accelerometers together with a pressure hydrophone and electronics are all housed within one pressure vessel.
42 Citations
23 Claims
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1. A direction finding, motion-sensitive transducer, comprising:
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(a) an inertial mass; (b) means defining a mounting base; (c) resilient means interconnecting said inertial mass with said mounting base, said inertial mass extending along a symmetry axis when at rest in a non-accelerated condition, and said resilient means being adapted to permit the inertial mass to wobble relative to the mounting base in radial directions relative to said symmetry axis in response to and in accordance with the direction of components of acceleration of the mounting base which are transverse to the symmetry axis; (d) a plurality of sensing elements arranged to respond to the wobbling motion of the inertial mass relative to the mounting base, with said sensing elements being located so as to define multiple directional channels which are adapted to produce outputs dependent on the directions of said acceleration components, and wherein (e) said inertial mass, said resilient means and said sensing elements together define resonant systems, and damping means common to said inertial mass, said resilient means, said sensing elements and the multiple directional channels defined by the latter for controlling the resonance of said systems. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification