Measuring and testing – Vibration – By mechanical waves
Patent
1982-03-24
1983-10-11
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
044084935
ABSTRACT:
An apparatus for generating acoustic waves of wavelength .lambda. in an electrically conductive object includes an electromagnetic acoustic transducer, with a source of magnetic flux for producing a magnetic field in the object, a first periodic coil within the field, and a second periodic coil within the field and offset from the first coil by .lambda./4. A first port of a four port hybrid is connected to the first coil and a second port is connected to the second coil, with a 90.degree. phase delay element interposed between the first port and the first coil. A signal generator provides an input signal at a frequency corresponding to .lambda., with a transmitter for applying the signal to either a third or a fourth port of the hybrid to generate a unidirectional wave in one of two opposite directions. An apparatus for detecting acoustic waves includes a first receiver connected to the third port and a second receiver connected to the fourth port.
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patent: 4080836 (1978-03-01), Thompson et al.
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Fredrick, Useful Relationships in 180.degree. Hybrids, Anzac Electronics Technical Note, p. 225.
Freeman, Hybrid Transformers--Part 1, Telecommunications Journal of Australia, vol. 27, p. 246 (1977).
Birmiel Howard A.
Deinken John J.
Hamann H. Fredrick
Malin Craig O.
Rockwell International Corporation
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