Omnidirectional monitor buoy
First Claim
1. In an immersible acoustic doppler monitor system for detection of the patterned cadence propulsive movements of a distant object in the surrounding fluid, a transducer assembly comprising:
- An active right circular cylindrical transducer element having a coaxial right circular cylindrical cavity extending between opposite bases;
an electrically conductive coating on the cylindrical surfaces of said element;
a resilient electrically insulative material encasing said element; and
,a first pair of elastic disks of a sound absorbent material, each coaxially disposed on opposite bases of said encased element, and each having a diameter in excess of said encased element.
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Accused Products
Abstract
An underwater intrusion alarm system using an array of one or more remotelyeployable, acoustic doppler detector probes. Each probe is a unitary submersible buoy formed by a pair of vertically coaxially and acoustically isolated, right cylindrical active transducer elements that are shielded from surface and bottom reflections. Transmitter and receiver circuits may be located either in the buoy with an external connection to conveniently located headphones and alarms or at a distant site with a fixed wire connection to the buoy transducer elements. A depth sensitive ancilliary mechanism regulates the submergence of the buoy in conformance with the rise and fall of the tide.
24 Citations
31 Claims
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1. In an immersible acoustic doppler monitor system for detection of the patterned cadence propulsive movements of a distant object in the surrounding fluid, a transducer assembly comprising:
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An active right circular cylindrical transducer element having a coaxial right circular cylindrical cavity extending between opposite bases; an electrically conductive coating on the cylindrical surfaces of said element; a resilient electrically insulative material encasing said element; and
,a first pair of elastic disks of a sound absorbent material, each coaxially disposed on opposite bases of said encased element, and each having a diameter in excess of said encased element. - View Dependent Claims (2, 3, 4)
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5. An immersible acoustic doppler monitor system having a field pattern with a conoid primary lobe for providing an alarm system in response to detection of patterned cadence propulsive movements of a distant object in the surrounding fluid, comprising:
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a first and a second coaxially spaced-apart and acoustically isolated transducer assembly each comprised of; a right circular cylindrical transducer element having a coaxial right circular cavity extending between opposite bases; an electrically conductive coat covering the cylindrical surfaces of said element; and
,a pair of disks each having a circumference bounding an edge of the the primary lobe, each being formed of a center layer of an electrically conducting material covered on each face with an electrically insulating, elastic material, each disk symmetrically disposed in parallel planes about a different base of said element; intermediate means for retensive holding each of said transducer assemblies coaxially spaced apart in acoustic isolation while immersed; transmitter means electrically coupled across radially opposite surfaces of said element of said first assembly and adapted to provide an electrical signal having a selected acoustic frequency; receiver means electrically coupled across radially opposite surfaces of said element of said second assembly and adapted to provide an electrical alarm signal in response to a pressure variation at the surface of said encased second element; and
,a pair of electrically conductive means each for coupling a different pair of said electrically conducting center layers to a remote ground potential. - View Dependent Claims (6)
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7. A transducer having a field pattern characterized by a conoid primary lobe, comprising:
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a cylindrical transducer element with a coaxially cylindrical cavity extending through opposite bases; electrically conductive means covering the cylindrical surfaces of the element; an acoustic coupling encasing the element; and
,a pair of layers of sound absorbent material coaxially disposed about the opposite bases, the perimeter of each layer defining the primary lobe. - View Dependent Claims (8, 9, 10, 11)
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12. A transducer having a field pattern characterized by a conoid primary lobe in the surrounding medium, comprising:
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a cylindrical transducer element having a coaxially cylindrical cavity extending through opposite bases; an electrically conductive coating covering the cylindrical surfaces of the element; a resilient and electrically insulating material uniformly encasing the element; and
,a first pair of disks of a sound absorbent material coaxially positioned in parallel planes at the opposite bases, each circumferentially extending into a null adjacent the primary lobe. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A transducer for creating an omnidirectional field pattern in a surrounding medium having a major lobe, comprising:
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a right circular cylindrical transducer element having a coaxial right circular cylindrical cavity extending between opposite bases; an electrically conductive coating covering the cylindrical surfaces of the element; a resilient and electrically insulating material encasing the element; and
,a first pair of elastic disks each coaxially disposed in parallel planes about the opposite bases, and each disk having a radius substantially equal to the radial distance between the axis of the element and an edge of the major lobe. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A transducer for creating in a surrounding medium an omnidirectional field pattern having a primary lobe, comprising:
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a cylindrical transducer element having a coaxially cylindrical cavity extending through opposite bases; an electrically conductive coating covering the surfaces of the element; a resilient and electrically insulating material encasing the element; and
,a first pair of disks of a sound absorbent material coaxially positioned at the opposite bases, each circumferentially extending to an edge of the primary lobe. - View Dependent Claims (28, 29, 30, 31)
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Specification