| Autor: |
Yusuke Ikeda, Yasuhiro Oikawa, Minoru Yoshii, Hayato Niwa, Kenji Ishikawa, Takashi Onuma, Kohei Yatabe |
| Rok vydání: |
2016 |
| Předmět: |
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| Zdroj: |
The Journal of the Acoustical Society of America. 140:3087-3087 |
| ISSN: |
0001-4966 |
| DOI: |
10.1121/1.4969619 |
| Popis: |
Imaging of a sound field aids understanding of the actual behavior of the field. That is useful for obtaining acoustical spatial characteristics of transducers, materials and noise sources. For high spatial resolution imaging, optical measurement methods have been used thanks to its contactless nature. This paper presents sound field imaging method based on parallel phase-shifting interferometry, which enables to acquire an instantaneous two-dimensional phase distribution of light. Information of sound field is calculated from the phase of light based on the acousto-optic theory. The system consists of a polarization interferometer and high-speed polarization camera. The number of the measurement points in a single image are 512 × 512 and the interval between adjacent pixels is 0.22 mm. Therefore, the system can image a sound field with much higher spatial resolution compared with conventional imaging methods such as microphone arrays. The maximum frame rate, which is corresponding to the sampling frequen... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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