Method and apparatus for beam steering and bessel shading of con

Details Method and apparatus for beam steering and bessel shading of con Method and apparatus for beam steering and bessel shading of con

1995-11-22

1997-06-17

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367912, H04R 144

Patent

active

056403712

ABSTRACT:
This invention describes a methodology to image features using an array of multiple piezo-electric elements which employs the selective use of mechanical and electronic beam focusing, electronic beam steering and amplitude shading to increase resolution and overcome side lobe effects. This invention introduces a novel signal reconstruction technique utilizing independent array element transmission and reception, creating focusing and beam steering. Application of the methodology can be used in wireline, measurement while drilling, pipe and pipeline and medical applications. Applications include, but are not limited to Bore hole Caliper, Bore hole Geometry, Bore hole Imaging, Casing Inspection, Cement Evaluation and Volumetric Scanning Applications (e.g. Fluid, Behind Casing and Open Hole). The configuration of the transducer array is preferably cylindrical, but may be conical, biconical, convex, concave or may take the form of a number of suitable geometric configurations. The transducer array may incorporate a transformer block having an array of multiple transformers therein for connection to individual transducer circuits. The transformers may be fixed or capable of being mechanically tuned as desired.

REFERENCES:
patent: 3697937 (1972-10-01), Ingram
patent: 4516583 (1985-05-01), Richard
patent: 4580252 (1986-04-01), Mallett
patent: 4682308 (1987-07-01), Chung
patent: 4833360 (1989-05-01), Holly
patent: 5060651 (1991-10-01), Kondo et al.
patent: 5089989 (1992-02-01), Schmidt et al.

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