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- W1607058714 abstract "Among physical phenomena consisting in variation of the polarization ofa shear ulrasonic wave the acoustic analogs of the Faraday and the Cotton-Mouton effects are investigated at present (see [1] and [2] – the first theorec-tical papers, [3] – discovery of rotation of the polarization, and [4] –[7] – someexperiments). They are observed when initially linearly polarized ultrasonicwave propagates inside a bulk specimen and are due to interaction betweenelastic and magnetic subsystems or conduction electrons. Quantitative char-acteristics of the effects are polarization parameters: e– the ellipticity whichmodulus is the ratio of the minor and major ellipse axes and φ– the angleof rotation of the polarization plane or, more correctly, of the major ellipseaxis if e6= 0. Most of recent experiments on polarization phenomena we reperformed with the use of phase-amplitude methods. A review of them isgiven in Ref. [8].Besides, a phenomenon is considered as the acoustic analog of magneto-optic Kerr effect if variation of the polarization occurs while reflection ofthe wave from an interface between magnetic medium and isotropic non-magnetic one. It was predicted by Vlasov and Kuleev [9] in 1968, however,there was no papers yet about experiments in which both the parameterscharacterizing the polarization, eand φ, were measured.We have completed such an experiment and the results will be publishedsoon. While performing it we found that a very small variations of a highlevel signal took place and came to a conclusion that amplitude variant of atechnique should be more suitable here.First amplitude technique for a precise measurement of φwas introducedby Boyd and Gavenda [10]. Its aplicability was limited to the case wheree≈ 0. Though, we developed an amplitude method free of this restrictionfor measuring φas well as e. A description of the technique is the subject ofthis paper.1" @default.
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- W1607058714 date "2011-01-01" @default.
- W1607058714 modified "2023-09-27" @default.
- W1607058714 title "Technique for measuring the parameters of polarization of an ultrasonic wave" @default.
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