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- W4238564067 abstract "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 frequency, is 1.55 M frames per second. This paper contains the principle of optical measurement of sound, the description of the system, and several experimental results including imaging of sound fields generated by transducers and reflection of the sound waves." @default.
- W4238564067 created "2022-05-12" @default.
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- W4238564067 date "2016-01-01" @default.
- W4238564067 modified "2023-10-12" @default.
- W4238564067 title "Optical sensing of sound fields: non-contact, quantitative, and single-shot imaging of sound using high-speed polarization camera" @default.
- W4238564067 doi "https://doi.org/10.1121/2.0000464" @default.
- W4238564067 hasPublicationYear "2016" @default.
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