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Acoustic-surface-wave disc delay lines

Acoustic-surface-wave disc delay lines

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An acoustic-surface-wave beam, launched along the chord of a disc, will fold compactly into an extended delay path. The rounded edges of the disc act as geodesic lenses. Beam-guiding can be obtained by repetitive focusing at the edge. A 96 μs 41 MHz prototype disc delay line is described.

References

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      • S.L. Quilici , H.J. Shaw . Helical surface-acoustic-wave delay line. Electron. Lett. , 625 - 626
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      • J.H. Eveleth . A survey of ultrasonic delay lines operating below 100 Mc/s. Proc. Inst. Elec. Electron. Eng. , 1406 - 1428
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      • Righini, G.C., Russo, V., Sottini, S., Toraldo di Francia, G.: `Geodesic lenses for integrated optics', Proceedings of the european microwave conference, 1973, Brussels, Belgium, 1, Brussels University.
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      • H. Kogelnic , T. Li . Laser beams and resonators. Appl. Opt. , 1550 - 1566
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      • I.M. Mason . Anisotropy, diffraction, scaling, surface wave lenses and focussing. J. Acoust. Soc. Am.
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