Measuring and testing – Vibration – By mechanical waves
Patent
1977-09-02
1978-11-28
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
73643, G01N 2904
Patent
active
041270355
ABSTRACT:
A magnet is used to create a static magnetic field adjacent to the surface of a conductive material. At least one conductor runs through the magnetic field. When a pulse of current flows through the conductor, an elastic wave is generated in the material. In a preferred embodiment, a row of individual permanent magnets is used to create a periodic magnetic field. One side of a coil is placed in the periodic magnetic field so that a sheet of current moves transverse to the magnetic field when a pulse of current flows through the coil. When the coil is oriented parallel to the row of magnets, a horizontal shear wave is generated in the material. When the coil is oriented transverse to the row of magnets, a Lamb wave is generated in the material.
REFERENCES:
patent: 3583213 (1971-06-01), Houck
patent: 3850028 (1974-11-01), Thompson et al.
Beauchamp John P.
Humphries L. Lee
Malin Craig O.
Queisser Richard C.
Rockwell International Corporation
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