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Seeing sound by lightSound field visualization and analysis by acousto-optic sensing 
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Sound travels through the air as waves, much like ripples on the water's surface, but its propagation cannot be directly observed. In this study, we use optical technologies to visualize sound waves in high resolution, providing a detailed analysis of how sound is generated and transmitted. Unlike conventional microphones that only measure the waveform at the positions where the microphones are installed, we capture sound waves as images using optical technology and high-speed cameras. Furthermore, we have developed a deep learning-based noise reduction technique for sound field images, achieving highly accurate visualization of sound. Although sound is vital to our daily lives, many research questions still need to be answered, such as what constitutes ideal sound and how it should be evaluated. Through our research into new optical sound measurement technologies, we aim to contribute to scientific research and manufacturing related to sound and to create a comfortable acoustic environment.
[1] S. A. Verburg, K. Ishikawa, E. Fernandez-Grande, Y. Oikawa, “A century of Acousto-optics: from early discoveries to modern sensing of sound with light,” Acoustics Today, Vol. 19, pp. 54-62, 2023.
[2] K. Ishikawa, “Imaging and Precise Measurement of Sound by Light,” J. IEICE, Vol. 106, No. 9, pp. 849-854, 2023.
[3] K. Ishikawa, D. Takeuchi, N. Harada, T. Moriya, “Deep sound-field denoiser: optically-measured sound-field denoising using deep neural network,” Optics Express, Vol. 31, No. 20, pp. 33405-33420, 2023.
Kenji Ishikawa, Computational Modeling Research Group, Media Information Laboratory