Literaturnachweis - Detailanzeige
| Autor/inn/en | Bertaix, V.; Garson, J.; Quieffin, N.; Catheline, S.; Derosny, J.; Fink, M. |
|---|---|
| Titel | Time-reversal breaking of acoustic waves in a cavity. |
| Quelle | In: American journal of physics, 72 (2004) 10, S. 1308-1311
PDF als Volltext |
| Sprache | englisch |
| Dokumenttyp | online; gedruckt; Zeitschriftenaufsatz |
| ISSN | 0002-9505; 1943-2909 |
| DOI | 10.1119/1.1773577 |
| Schlagwörter | Elektrische Messtechnik; Akustik; Low-Cost-Experiment; Physikunterricht; Schallschwingung; Ultraschall; Thermometer |
| Abstract | Acoustic time-reversal is a well-established technique that focuses an ultrasonic wave on the location of its source. It is based on the time-reversal invariance of the wave equation and is usually implemented using time-reversal mirrors made up of a hundred of piezoelectric transducers. However, a time-reversal experiment can be performed in a closed cavity ~a water-filled beaker! with only one transducer as a pulse-echo system. This easy-to-build and low cost experiment involves students in the general concept of the time-reversal invariance of the wave equation. We show that it also can be adapted to become an ultrasonic time- reversal thermometer. A careful study of the focal point shows a dependence of its position as a function of temperature variations. © 2004 American Association of Physics Teachers. |
| Erfasst von | Arbeitsgruppe Didaktik der Physik, Universität Osnabrück |
| Update | 2005/2 |
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