Conical ultrasound waveguide

Details Conical ultrasound waveguide Conical ultrasound waveguide

1996-01-16

1997-02-25

Lee, Benny

Wave transmission lines and networks

Coupling networks

Delay lines including elastic bulk wave propagation means

333142, 333147, 310334, 381153, 381159, 181182, 181189, H03H 900

Patent

active

056062974

ABSTRACT:
A waveguide for projecting a longitudinal acoustic wave of wavelength .lambda. from an ultrasound energy source toward a target area. The waveguide has at least one tubular channel. The channel has inwardly tapered, conical inlet and outlet ports separated by a venturi. The inlet port taper defines a sharply rimmed entry orifice around the inlet port. A separation distance equal to one wavelength .lambda. is maintained between the source and the waveguide's inlet port. The waveguide shears off a cross-section of the wave emitted by the energy source and ejects it at accelerated velocity toward the target area. The channel has a length L and the venturi has a diameter D, such that the waveguide has an emitted beam angle equal to 2 (tan.sup.-1 (D/L)). Preferably, a plurality of tubular channels are aligned concentrically around and longitudinally parallel to the one tubular channel, each channel having a selected length and a selected diameter. The channels are preferably circular in cross-section, with their outlet ports located in an inwardly scalloped front face of the waveguide.

REFERENCES:
patent: 4077023 (1978-02-01), Boyd et al.
patent: 4119934 (1978-10-01), Weglein et al.
patent: 4742318 (1988-05-01), Jen et al.
patent: 4743870 (1988-05-01), Jen et al.
patent: 5131052 (1992-07-01), Hill et al.
patent: 5294861 (1994-03-01), Nattermann

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