| Autor: |
J Ma, Shan Che, Humphrey J. Maris, Arto V. Nurmikko, T. J. Grimsley, Qiang Zhang, Cuong Dang, F Yang, T. Atay |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Journal of Physics: Conference Series. 92:012024 |
| ISSN: |
1742-6596 |
| Popis: |
The propagation of ultra-short sound pulses in water is studied by using the picosecond ultrasonic technique. A sound pulse is generated when light is absorbed in a metal transducer film deposited onto a substrate. The sound propagates across a thin layer of water and is then reflected back to the surface at which it was generated. The efficiency of optoacoustic detection of the reflected sound is enhanced through the use of a resonant optical cavity. We show that the variation of the shape of the returning sound pulse with propagation distance agrees with that calculated by using the attenuation of sound in water that has been measured at lower frequencies. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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