Magnetostrictive transducer for logging tool

Details Magnetostrictive transducer for logging tool Magnetostrictive transducer for logging tool

1990-02-06

1991-05-28

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367 31, 367 75, 367156, 181106, G01V 140, H01L 4110, H04B 1300

Patent

active

050200364

ABSTRACT:
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 formed in a housing section of the logging tool. The logging tool cavity may be exposed to wellbore fluid in direct contact with the plate member whereby acoustic pressure pulses may be delivered directly to the wellbore fluid by the transducer element. Spaced apart electromagnets are disposed in the housing section on opposite sides of the cavity for effecting controlled displacement of the plate member to generate acoustic waves in a liquid-filled wellbore.

REFERENCES:
patent: 1882399 (1932-10-01), Pierce
patent: 2496484 (1950-02-01), Massa
patent: 3174130 (1965-03-01), Woollett
patent: 4160232 (1979-07-01), Wilson et al.
patent: 4516228 (1985-05-01), Zemanek
patent: 4754441 (1988-06-01), Butler
patent: 4782910 (1988-11-01), Sims et al.
patent: 4862991 (1989-09-01), Hoyle et al.
patent: 4864548 (1989-09-01), Butler
patent: 4869349 (1989-09-01), Minear et al.
patent: 4899844 (1990-02-01), Katahara et al.

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