Measuring and testing – Vibration – By mechanical waves
Patent
1981-04-23
1983-04-26
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73598, 73599, G01N 2904
Patent
active
043809316
ABSTRACT:
An apparatus and method for quantitative nondestructive testing (NDT) of a wire wherein noncontacting ultrasonics is used. A transmitter-transducer coil is held in close proximity of a test wire or tube and high amplitude electrical current pulses are passed in the coil. A magnetic field perpendicular to the longitudinal axis of the wire is applied in the region. As a result of the electrical current pulses in the transducer coil, eddy currents are produced on the surface of the test wire. As a result of the magnetic field applied in the region, these eddy currents lead to Lorentz forces in the wire, which in turn generate corresponding torsional waves in the test wire. These waves speed down the wire and are received by a reciprocal transduction process, by means of a receiver-transducer. The velocity and attenuation measurements of the torsional waves along the axis of the test wire are made precisely and accurately via multiple-transducer setups. The data are interpreted in terms of the material conditions including mechanical defects or flaws in the test wire.
REFERENCES:
patent: 3850028 (1974-11-01), Thompson et al.
patent: 4092868 (1978-06-01), Thompson et al.
patent: 4164873 (1979-08-01), Bottcher et al.
patent: 4307616 (1981-12-01), Vasile
patent: 4312231 (1982-01-01), Kawashima et al.
Frost et al., "Velocity and Attenuation in Metal Waveguides," paper given session Physical Acoustics IV; Ultrasonics and Materials, Acoustical Society of America Spring Meeting, Apr. 24, 1980.
Frost Harold M.
Prout James H.
Reed Robert W.
Beers Robert F.
Birmiel Howard A.
Lall Prithvi C.
McGill Arthur A.
The United States of America as represented by the Secretary of
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