Measuring and testing – Vibration – By mechanical waves
Patent
1976-07-23
1978-07-18
Queisser, Richard C.
Measuring and testing
Vibration
By mechanical waves
73643, 73609, G01N 2904
Patent
active
041008090
ABSTRACT:
A method and apparatus for excitation and reception of ultrasonic plate waves in a workpiece in which the surface of the workpiece is acted upon by a high-frequency electromagnetic field excited by a system of flat radiators forming a comb-shaped structure and positioned discretely in the direction of radiation with a pitch divisible by the wave length. A magnetizing field, whose vector is parallel to the surface of the workpiece under test, is introduced into the workpiece in the area of the high-frequency electromagnetic field and the vector of the magnetizing field is arranged at an angle relative to the radiation direction with respect to the flat radiator array to excite transverse normal waves.
REFERENCES:
patent: 3436958 (1969-04-01), Proctor
patent: 3786672 (1974-01-01), Gaerttner
patent: 3850028 (1974-11-01), Thompson
patent: 3869683 (1975-03-01), Sokoloski
patent: 3872378 (1975-03-01), Shiraiwa et al.
patent: 3919669 (1975-11-01), Hartemann
patent: 3964296 (1976-06-01), Matzuk
patent: 3975698 (1976-08-01), Redman
Lockett, T. K.; "Lamb and Torsional Waves and Their Use in Flaw Detection", Ultrasonics, Jan. 1973, pp. 31-37.
Bobrov Vladimir Timofeevich
Druzhaev Jury Avraamovich
Lebedeva Nelli Alexandrovna
Kreitman Stephen A.
Queisser Richard C.
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