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| Number | Title | Issue Date |
| 4706230 | Underwater low-frequency ultrasonic wave transmitter Non-active columnar members are disposed on both sides of an active columnar member consisting of a piezoelectric ceramic material or a magnetically strainable material. Levers are connected to the active and non-active columnar members via first and seco... | 11/10/1987 |
| 4700803 | Transducer forming compression and shear waves for use in acoustic well logging For use in acoustic logging, an acoustic wave transducer system forming both compression and shear waves is disclosed, the system having the preferred form of a plurality of radially directed magnetostrictive expansion means, being N in number, each havin... | 10/20/1987 |
| 4642802 | Elimination of magnetic biasing using magnetostrictive materials of opposite strain The transducer of this invention provides a one-to-one input-to-output frequency relationship by the use of different magnetostrictive materials within the same transducer, the materials each having positive and negative strain expansion coefficients. The... | 02/10/1987 |
| 4641291 | Phased array Doppler sonar transducer A plurality of piezoelectric or magnetostrictive rectangular planar staves are held in side-by-side relation in a laminate assembly including insulative spacers. The widthwise polarity of adjacent pairs of the staves are inverted relative to each other. T... | 02/03/1987 |
| 4636999 | Magnetostrictive pulse generator A magnetostrictive generator includes a magnetostrictive transducer having a vanadium permandur core and series connected primary and secondary windings, the secondary winding having more turns that the primary winding. A commutating capacitor is connecte... | 01/13/1987 |
| 4604612 | Ice detector An ice detector to detect a lyaer of ice on a thin solid sheet 14, such as the skin of an aircraft wing, even in the presence of water, comprises two ultrasonic transducers attached to the sheet. The first transducer 10 is adapted to cause propagation of ... | 08/05/1986 |
| 4541081 | Electroacoustic transducer An improved transducer for generating and receiving acoustic energy. A transducer core is constructed by bonding together a plurality of concentric cylinders to provide a ferromagnetic core. A magnetic vector is established circumferentially about the cor... | 09/10/1985 |
| 4443731 | Hybrid piezoelectric and magnetostrictive acoustic wave transducer The transducer is one that combines magnetostrictive and electrostrictive/piezoelectric transducer effects to form a transducer with improved performance. A transducer is provided which the two aforementioned effects are mechanically coupled in series all... | 04/17/1984 |
| 4438509 | Transducer with tensioned-wire precompression A rod of magnetostrictive material has its ends placed between steel bars which provide compression on the rod by tensioning wires connected between the bars. Preferably, the wires are equally spaced along the bars from the rod so that when the wires are ... | 03/20/1984 |
| 4384351 | Flextensional transducer A magnetic drive is provided for a flextensional transducer in order to adapt the flextensional transducer for operation at increased ocean depths without the necessity of liquid filling and complex decoupling devices. In one embodiment an electro-magneti... | 05/17/1983 |
| 4361879 | Ferrofluid transducer An underwater sound generator composed of a ferrofluid contained within a toroidal container which has a rigid bottom and top and elastic cylindrical side walls. A coil of wire links the toroidal container and is adapted to be connected to a dc bias sourc... | 11/30/1982 |
| 4308603 | Ferrofluid transducer A magnetic fluid transducer for producing a low-frequency sound field in a fluid medium. The device comprises a non-magnetic cylindrical housing with end windows. The housing is surrounded by a magnetic-field-generator means and contains a magnetic fluid ... | 12/29/1981 |
| 4296486 | Shielded electromagnetic acoustic transducers Disclosed is an electromagnetic acoustic transducer, including a source of magnetic flux for establishing a static magnetic field, an electrical conductor for conducting an alternating current in the static magnetic field, and an electrically conductive, ... | 10/20/1981 |
| 4223401 | Broadband free-flooding magnetostrictive scroll transducer A free-flooding, deep submergence cylindrical magnetostrictive transducer ving a plurality of identical, coaxial, ring-shaped scrolls, surrounded by a toroidal coil, the scrolls being vibration isolated from each other and from the coil, and having ring r... | 09/16/1980 |
| 4160232 | Low frequency dipole hydrophone transducer A dipole hydrophone transducer which includes first and second magnetostrictive arms and associated windings. One arm includes a radiation target for acoustic energy for production of proportional signals in the windings and the other arm includes a count... | 07/03/1979 |
| 4160231 | Low frequency dipole hydrophone transducer A dipole hydrophone which includes a radiation target for acoustic energy and a counterbalancing mass. A first multilaminar magnetostrictive arm is connected to the radiation target at its center gravity and a second multilaminar magnetostrictive arm is s... | 07/03/1979 |
| 4129851 | Electroacoustic transducer with a magnetostrictive core Electromechanical transducer includes a magnetostrictive core formed of a superimposed stack of individual plates disposed within a cylindrical protective sheath and having a coil wound thereon in longitudinal direction thereof, the plates having the shap... | 12/12/1978 |
