Monopole, dipole, and quadrupole borehole seismic transducers

Details Monopole, dipole, and quadrupole borehole seismic transducers Monopole, dipole, and quadrupole borehole seismic transducers

1991-01-09

1992-05-05

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73151, 166249, E21B 4325

Patent

active

051096986

ABSTRACT:
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 of cylindrical sections. The shell or the sections may be pre-stressed or preformed to encourage certain bending motions. Depending on the configuration of the transducer, it approximates a monopole, dipole, or quadrupole radiator. Various actuating means, including magnetostrictive forces and piezoelectric forces, are used to drive the motions of the transducer. These transducers are especially useful for generating compressional, shear, or other elastic waves in solids. For example, in geophysical applications, the transducers are placed in boreholes for either hole-to-hole or single hole measurements.

REFERENCES:
patent: 4469175 (1984-09-01), Massa
patent: 4788467 (1988-11-01), Plambeck
patent: 4888740 (1989-12-01), Brie et al.

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