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| Autor/inn/en | Hitachi, A.; Takata, M. |
|---|---|
| Titel | Babinet's principle in the Fresnel regime studied using ultrasound. |
| Quelle | In: American journal of physics, 78 (2010) 7, S. 678-684
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| Sprache | englisch |
| Dokumenttyp | online; gedruckt; Zeitschriftenaufsatz |
| ISSN | 0002-9505; 1943-2909 |
| DOI | 10.1119/1.3383929 |
| Schlagwörter | Experiment; Babinet-Theorem; Physikunterricht; Ultraschall; Interferenz |
| Abstract | The diffraction of ultrasound by a circular disk and an aperture of the same size has been investigated as a demonstration of Babinet's principle in the Fresnel regime. The amplitude and the phase of the diffracted ultrasonic waves are measured and a graphical treatment of the results is performed by drawing vectors in the complex plane. The results verify Babinet's principle. It is also found that the incident wave is ¶/2 behind the phase of the wave passing through on the central axis of a circular aperture. Because both waves travel the same path and the same distance, they should be in phase. This paradox has previously been regarded as a defect of Fresnel's theory. © 2010 American Association of Physics Teachers. |
| Erfasst von | Arbeitsgruppe Didaktik der Physik, Universität Osnabrück |
| Update | 2010/4 |
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