Class 367/156 - Magnetostrictive

Subclass of Class 367 - Communications, electrical: acoustic wave systems and devices
Definition: Subject matter wherein the transducers are of the magnetostrictive
No. of patents: 28
Last issue date: 10/30/2007

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Number	Title	Issue Date
7289038	Underwater sound radiation apparatus A plurality of actuators are provided at predetermined intervals on the reverse surface of a predetermined side wall of a swimming pool. When an electric signal corresponding to a sound to be propagated in the water is given to the actuators, the electric signal is ...	10/30/2007
6600962	Sensor controller A control system for controlling a variable of a device by an end element is disclosed. The control system has as its input a magnetostrictive position sensing probe for measuring the value of the variable of the device at time intervals and a digital con...	07/29/2003
5615172	Autonomous data transmission apparatus A autonomous borehole data transmission apparatus for transmitting measurement data from measuring instruments at the downhole end of a drill string by generating pressure pulses utilizing a transducer longitudinally responsive to magnetic field pulses ca...	03/25/1997
5568448	System for transmitting a signal A magnetostrictive element generates an ultrasonic wave and the generated ultrasonic wave is propagated through a propagation medium. An acoustic wave receiver receives the propagated ultrasonic wave at the other end of the propagation medium and converts...	10/22/1996
5414397	Clamping device for magnetostrictive bodies The invention relates to an elastic clamping device for at least one body with magnetostrictive properties, wherein a pressure force presses the clamping device against the inner magnetostrictive body with a predetermined force. The pressure force extends...	05/09/1995
5357232	Magnetostrictive element A magnetostrictive element includes a magnetostrictive member, an outer magnet disposed coaxially about, spaced apart from, and surrounding the magnetostrictive member, and a soft magnetic yoke for magnetically coupling the magnetostrictive member and the...	10/18/1994
5355351	Underwater low-frequency sound producer using a rare earth alloy An underwater low-frequency sound producer comprises vibrator units each including a magnetostrictive rod formed of a rare-earth alloy, a permanent magnet for providing a magnetic bias to the rod, prestress bolts for prestressing the rod, a coil wound on ...	10/11/1994
5130953	Submersible electro-acoustic transducer An electro-acoustic transducer comprises two transducer units each having first and second ends, a tubular supporting member disposed between the two transducer units, and a pair of oppositely disposed supporting components between which the transducer un...	07/14/1992
5079460	Magnetostrictive roller drive motor A magnetostrictive drive motor having a rotary drive shaft in the form of a drum which is encircled by a plurality of substantially equally spaced roller members in the form of two sets of cones which are in contact with respective cam surfaces on the ins...	01/07/1992
5030873	Monopole, dipole, and quadrupole borehole seismic transducers Various configurations of cylindrically shaped transducers are used as borehole seismic wave sources. The basic class of transducers of this invention has an outer shell that is generally cylindrical, and may be comprised sections. The shell or the sectio...	07/09/1991
5020036	Magnetostrictive transducer for logging tool An acoustic wellbore logging tool transducer formed of a composite plate member having at least one plate of a magnetostrictive material which responds to a magnetic field to elongate or contract to effect displacement of said plate member within a cavity...	05/28/1991
4970464	Linear position-displacement magnetostrictive transducer having multiple cylindrical electromagnets for generating flux, each electromagnet having a centered passageway for relative travel along the same magnetostrictive waveguide When observing or setting changeable positions of respective movable components of a machine, such as movable saws of a multiple cut sawing machine, each linear position-displacement transducer used has the wave guide housing thereof, made of sufficient l...	11/13/1990
4907209	Low frequency sound transducer A low frequency sound producer including a plurality of magnetostrictive vibrators arranged seriatim end to end to define a ring. Each vibrator unit includes a plurality of laterally related magnetostrictive rods which, in the illustrated embodiment, are ...	03/06/1990
4894811	Outboard-driven flextensional transducer A flextensional transducer having an elliptically-shaped shell is compressed at its ends by either piezoelectric or magnetostrictive drive assemblies which are constrained from longitudinal movement by a rigid mount. The compression may be provided by a r...	01/16/1990
4864548	Flextensional transducer An acoustic transducer for providing large displacements particularly at low acoustic frequencies is formed from a minimum of three curved shells which are attached to each other at their ends. The shells are driven by a ring or corresponding number of at...	09/05/1989
4802660	Electrically controlled spring element An electrically controlled spring element according to the invention comprises one or more basic spring elements and a mechanical transformer to increase the stretch of the spring element. The basic spring element comprises two mechanically connected elem...	02/07/1989
4742499	Flextensional transducer An acoustic transducer for providing large displacements particularly at low acoustic frequencies is formed from a minimum of three curved shells which are attached to each other at their ends. The shells are driven by a ring or corresponding number of at...	05/03/1988
4716556	Magnetostrictive acoustic transducer An acoustic transducer is provided that uses a layer of magnetostrictive ferromagnetic material having high magneto-mechanical coupling. The ferromagnetic material is adhered to a part of the outer surface of a resilient rod, so that an incident acoustic ...	12/29/1987
4703464	Permanent magnet biased magnetostrictive transducer A transducer which uses paramagnetic magnetostrictive rods or bars, e.g., compositions of the lanthanide series of elements such as Tb0.3 Dy0.7 Fe2, has the bars biased with a lengthwise flux by a permanent magnet, e.g. sa...	10/27/1987
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
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
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
4497046	Long line hydrophone A long line hydrophone wound with a pair of bifilar ribbons that are connected to a constant current high frequency source....	01/29/1985
4482784	Position determination device A position determining device has two perpendicular longitudinal magnetostrictive elements. A grid of a plurality of closed loop conductors has two parallel straight legs which form the grid. A flux producing element inductively coupled to at least one of...	11/13/1984
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
4271490	Ultrasonic detection system An ultrasonic detection system having an array of ultrasonic transducers that are uniformly closely disposed relative to each other such that the active surfaces for transmission or reception are maintained on a straight or curved line. The transducers fo...	06/02/1981
4255800	Method and apparatus for locating underwater objects 2. In a combination, a transducer for an underwater object locator comprising a plurality of radiating elements, each element comprising a magnetostrictive member having a plurality of separate windings thereon, a first winding of each of said elements be...	03/10/1981

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Class 367/156 - Magnetostrictive