Determination of attenuation and phase velocity of hypersound by multiple-beam interferometry in evaporated wedge-shaped metal films

Lehr, B.; Ulrich, H.; Weis, O.

doi:10.1007/bf01297172

Cited by 10 publications

(1 citation statement)

References 6 publications

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“…Scattering at a narrow scratch can be used to get information about the effective width of a sound beam [17]. Whereas the electrical field of a coaxial resonator shows a rota- :ional symmetry, :his is no?…”

Section: Experiments To Determine the Lateral Dimensions Of The Soundmentioning

confidence: 99%

Experiments with narrow movable beams of pulsed sound waves at 35 GHz

Knöll

Weis

1995

Annalen der Physik

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Abstract. Only the study of absorption and angular dependent scattering of GHz and THz sound can give us detailed information about interaction processes of acoustical phonons. Therefore, the necessary techniques of sound generation, detection and undisturbed transmission to the target must be improved or to a large extent must still be developed. Corresponding attempts at 35 GHz are described. Sound-beam topography allowed to study crystal defects and also showed us where transmission without scattering occurred. For the piezoelectric generation a reflex klystron was used feeding a planar Hertzian resonator. The needle-like sound beams appeared as a double beam, each showing a minimum diameter of 35 pm for longitudinal polarized sound at an acoustic wavelength of 165 nm in X-cut quartz and 320 nm in a-cut sapphire. To obtain the smallest possible beam diameter for high resolution work, model calculations are presented for an excited fundamental Gaussian sound beam in an isotropic medium.

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Section: Experiments To Determine the Lateral Dimensions Of The Soundmentioning

confidence: 99%