Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1989-05-08
1990-07-10
Jordan, Charles T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
210748, 209155, 367140, B03B 100, H04R 1700
Patent
active
049411357
ABSTRACT:
A liquid column (2) is placed between two high-frequency ultrasound sources (6) in the field of a standing wave produced by the sources. Each source produces a convergent beam that compensates for a substantial part of the attenuation of the ultrasound energy that occurs at higher frequencies. It is thereby possible to increase considerably the axial distance along the standing wave over which streaming effects due to acoustic pressure are absent or negligible. It is also possible to increase the angle of convergence to compensate for divergence of the outputs from the sources.
REFERENCES:
patent: Re32062 (1986-01-01), Samodovitz
patent: 3397936 (1968-08-01), Frayne et al.
patent: 4218921 (1980-08-01), Oran et al.
patent: 4280823 (1981-07-01), Szonntagh
patent: 4423637 (1984-01-01), Soloway
patent: 4445380 (1984-05-01), Kaminski
patent: 4480324 (1984-10-01), Sternberg
Review of Scientific Instruments, vol. 53, No. 6, Jun. 1982, American Institute of Physics, (New York, U.S.), M. C. Lee et al.: "Acoustic Levitating Apparatus for Submillimeter Samples", pp. 854-859, see p. 854, col. 1, line 1-p. 855, col. 1, line 2; p. 858, col. 1, lines 13-19,; p. 859, col. 1, line 17-col. 2, line 3; FIG. 1.
Eldred J. Woodrow
Jordan Charles T.
National Research Development Corporation
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