Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1984-03-19
1986-10-21
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367185, 310 15, 73652, H04R 144, G01V 116
Patent
active
046189491
ABSTRACT:
A self-orienting, directionally sensitive particle velocity transducer with an axially magnetized magnet which, displaced by gravity, floats off-center in a chamber filled with ferromagnetic fluid. Wire coils affixed coaxially to the chamber ends asymmetrically intersect the magnet's flux lines. Axial chamber rotation results in gravitationally induced sideways movement of the magnet to maintain its equilibrium position. An impinging sound wave causes relative movement between the low inertia chamber-coil assembly and the high inertia magnet, thereby inducing a voltage in the coils--a relatively high voltage for vertical movement due to vertical assymetry, but a relatively low voltage for horizontal movement due to horizontal symmetry. Axial sensitivity is low because the ferromagnetic fluid filling the narrow gap between the magnet and the chamber ends resists relative axial movement and any induced voltages in the coils cancel. Substitution of an eccentrically weighted, axially polarized, composite magnet divided into oppositely polarized halves allows a smaller chamber and makes assymetry/symmetry independent of gravitationally induced displacement, thus allowing configuration for any direction of sensitivity.
REFERENCES:
patent: 2902667 (1959-09-01), Schriever
patent: 3054085 (1962-09-01), Alexander
patent: 3283293 (1966-11-01), Pavey, Jr. et al.
Magnetic Fluids Engineering Kit, Ferrofluidics Corporation.
Rosensweig, "Magnetic Fluids", Ferrofluidics Corp. Tech. paper.
Pihulic Daniel T.
Tarcza Thomas H.
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