Measuring and testing – Vibration – By mechanical waves
Patent
1975-12-12
1979-02-13
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73645, G01N 2900
Patent
active
041388941
ABSTRACT:
The device comprises an elongated acoustic wave translating isotropic body and a pair of transducers applied over one of the two parallel end faces thereof. Said transducers are arranged with relatively crossed axes of linear transversal polarization. The other end face of the isotrope body is intended to be applied to a sample or a structure made of an acoustically active substance presenting anisotropy, either intrinsic or induced, with respect to acoustical polarization. The length of the isotropic body is such that when the transducers are both simultaneously driven by pulsed high frequency voltages which are modulated in respective phase quadrature by a low frequency oscillation, the two transversal acoustic waves propagated through the body vectorially combine so that the opposite end face of the body is the subject of a constant amplitude acoustic wave which rotates at the speed of the pulsation of the low frequency. When, on the other part, an ellipticised acoustic wave of same high and low frequency components is applied from the acoustical polarized anisotropy sample or structure to the end face of the body deprived of transducers, the transducers on the opposite face receive the components of said ellipticized wave and feed circuits for analysing the said components and deriving therefrom the parameters of elliptization of the received wave.
REFERENCES:
patent: 2625035 (1953-01-01), Firestone
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patent: 3019636 (1962-02-01), Henry
patent: 3251026 (1966-05-01), May
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patent: 3524129 (1970-08-01), Ikrath
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patent: 3812709 (1974-05-01), Benson et al.
R. T. Smith, "Stress Induced Anisotropy in Solids the Acousto-Elastic Effect," Ultrasonics, Jul.-Sep. 1963, pp. 136-147.
Robert Andre
Rouge Jean
Kreitman Stephen A.
L'Electronique Appliquee
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