Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1989-10-05
1991-09-24
Moskowitz, Nelson
Acoustics
Geophysical or subsurface exploration
Well logging
73643, G01N 2904
Patent
active
050507036
ABSTRACT:
The invention furnishes an electrodynamic transducer head for a non-destructive testing of workpieces with electrically conductive surfaces by way of ultrasound. A magnet system is employed for generating of a static or a low-frequency magnet field, and at least one transducer coil is disposed at the front face of the magnet system disposed toward the workpiece. The transducer coil is furnished on the side toward the workpiece with a wear-resistant layer, and the transducer coil exhibits between itself and this front face of the magnet system an intermediate part with an insulating layer, which is solidly connected with the front face and with the coil adjoining at the insulating layer. The invention discloses production of a transducer coil, in a way which is simple and economical and results in a transducer head which can be universally employed, and where the eddy current formations, resulting in interfering signals, and the mechanical vibrations, both in the transducer coil as well as in the magnet system, are substantially suppressed or, respectively, damped. The intermediate part (10) comprises at least two layers (11, 12), where one of the layers (12) is electrically conductive and which layer ( 12) is made of a material thickness which is larger than the skin depth for a given high-frequency field.
REFERENCES:
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patent: 4602512 (1986-07-01), Kowol et al.
patent: 4665752 (1987-05-01), Huschelrath et al.
Maxfield et al; "Design of Permanent Magnet . . . "; 1976 Ultrasonics Symp. Proc., pp. 22-25.
Bottger Wolfgang
Graff Alfred
Schlawne Friedhelm
Wachter Michael
Kasper Horst M.
Mannesmann Aktiengesellschaft
Moskowitz Nelson
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