초록 ▼

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 within the housing. The magnetic field penetr

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 within the housing. The magnetic field penetrates the housing and interacts with the magnetic fluid. A body force is developed within the fluid which produces an internal pressure in local regions defined by the lines of magnetic flux. This internal pressure is transmitted by an acoustic transmitting medium to the surrounding fluid as a sound pressure level.

대표청구항 ▼

A device for producing low-frequency underwater acoustic sound waves comprising: a cylindrical housing of a material transparent to magnetic field lines; first and second window means enclosing opposite ends of the cylindrical housing and defining acoustic sound wave transmitting mediums; a ferromag

A device for producing low-frequency underwater acoustic sound waves comprising: a cylindrical housing of a material transparent to magnetic field lines; first and second window means enclosing opposite ends of the cylindrical housing and defining acoustic sound wave transmitting mediums; a ferromagnetic fluid confined between the first and second window means and completely filling the cylindrical housing; said first window means adapted for interfacing with water on its outside surface; means outwardly adjacent the second window means for decoupling acoustic sound waves having been transmitted through the second window means; magnetic field producing means surrounding the cylindrical housing and adapted for producing magnetic field lines axially within the housing; whereby, upon energization of the magnetic field producing means, the magnetic field lines within the housing causes a change in behavior of the ferromagnetic fluid for generating acoustic sound waves therein which are transmitted through the first window means to water interfacing with its outside surface.