Measuring and testing – Vibration – By mechanical waves
Patent
1988-09-26
1990-06-19
Myracle, Jerry W.
Measuring and testing
Vibration
By mechanical waves
73 191, 376258, G01N 2900
Patent
active
049341910
ABSTRACT:
A method for electromagnetic ultrasonic conversion includes exerting dynamic-mechanical forces upon particles of an electrically conductive material of a test sample by superimposing quasi-static magnetic and electromagnetic high-frequency fields of a transmission converter for generating ultrasonic vibrations when transmitting. Electrical fields are induced by waves arriving in the test sample resulting in vibrations of the particles of material inductively affecting the fields of a receiver converter when receiving. The excitation of the vibrations when transmitting and the induction of electrical fields when receiving are effected by Lorentz and magnetic forces as well as by magnetostriction forces if the test sample is ferromagnetic. Fill level and bubble formation are monitored in enclosures in the form of containers and pipelines for liquid, by coupling a transmission converter and a receiver converter to an enclosure wall. Ultrasonic vibrations are generated in the wall inducing echo signals differing by amplitude and/or phase in the receiver converter, depending on whether the interior of the enclosure contains liquid, liquid containing steam or gas bubbles, or only a fluid in the form of vapor or gas, while reflecting the signals on the inner boundary surface of the wall or striking a reflector after entering the liquid and traveling a distance therein, and reflecting the signals back from the reflector through the fluid and through the wall to the receiver converter.
REFERENCES:
patent: H608 (1989-03-01), Goolsby
patent: 3246516 (1966-04-01), Maropis
patent: 3656134 (1972-04-01), Brown
patent: 4144517 (1979-03-01), Baumoel
patent: 4203324 (1980-05-01), Baumoel
patent: 4320659 (1982-03-01), Lynnworth et al.
Maxfield, B. W. et al., "The Design and Use of Electromagnetic Acoustic Wave Transducers" Materials Evaluation (41), Nov. 1983, pp. 1399-1408.
Japanese Patents, vol. 10, No. 305 (P-507) [2361] Oct. 17, 1986; JP-A61120020 (Hitachi Ltd.), 7/6/86; Abstract & Figures are pertinent.
Ultrasonics Symposium, IEEE 1979, "Liquid Level Measurements Using Longitudinal, Shear, Extensional & Torsional Waves"; L. C. Lynnworth; pp. 376-379; and FIG. 2 are pertinent.
Huebschen Gerhard
Kroening Michael
Loehr Ernst
Repplinger Wilhelm
Salzburger Hans-Juergen
Greenberg Laurence A.
Lerner Herbert L.
Myracle Jerry W.
Siemens Aktiengesellschaft
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