Sound Field Measurements Based on Reconstruction from Laser Projections

Oikawa, Yasuhiro; Goto, Masayuki; Ikeda, Yusuke; Takizawa, Tsubasa; Yamasaki, Yoshio

doi:10.1109/icassp.2005.1416095

Cited by 18 publications

(3 citation statements)

References 5 publications

(5 reference statements)

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“…When light traverses a sound field, it experiences refraction and retardation effects. The phase shifts induced by sound onto a beam of light, can be measured via optical interferometry, which enables the measurement of sound via a tomographic reconstruction [5][6][7]. However, conventional tomographic techniques (such as Filtered Back Projection -FBP, or Algebraic Reconstruction Technique -ART) are not well-suited for acousto-optic measurements.…”

Section: Acousto-optic Sensingmentioning

confidence: 99%

Sound field reconstruction: towards large-scale spatial sensing

Fernandez-Grande,

Verburg,

Karakonstantis

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Over the last couple of decades, sound field analysis and reconstruction methods have enabled us to observe and better understand diverse acoustic phenomena, from jetnoise to the sound of historical violins. In a broad sense, sound field reconstruction methods consist of capturing the spatial properties of sound, in order to visualize, analyze, reproduce, or manipulate the sound field in various ways. Fueled by advances in instrumentation and signal processing, these methods have had a profound impact in the field of acoustics and have been widely adopted in areas like vibro-acoustics, spatial audio, room acoustics, materials and electroacoustics -among others. In this talk we discuss new approaches for capturing and reconstructing sound fields in space, motivated by some of the longstanding challenges in the field. Specifically, we consider: 1) novel sensing methods, with a focus on optical remote sensing and the acousto-optic interaction, to measure sound using light, 2) physical models for largescale sound field visualization/reconstruction and 3) Deep Learning approaches for augmenting conventional acoustic measurements. Finally, we share an outlook of this multifaceted and increasingly relevant domain of acoustics.

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Section: Acousto-optic Sensingmentioning

confidence: 99%

Sound field reconstruction: towards large-scale spatial sensing

Fernandez-Grande,

Verburg,

Karakonstantis

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…However, the application of acousto-optic tomography has been limited by the reliance on reconstruction algorithms originally developed for medical tomography, such as filtered backprojection (FBP). 17,33,34 These classical tomographic reconstruction methods do not take into account the nature of sound propagation and require very specific measurement configurations.…”

Section: Introductionmentioning

confidence: 99%

Acousto-optic holography

Verburg

Williams

Fernández-Grande

2022

The Journal of the Acoustical Society of America

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Acousto-optic sensing is based on the interaction between sound and light: pressure waves induce density variations, which, in turn, alter the way light propagates in air. Pressure fields are, thus, characterized by measuring changes in light propagation induced by pressure waves. Although acousto-optic sensing provides a way of acquiring acoustic information noninvasively, its widespread application has been hindered by the use of reconstruction methods ill-suited for representing acoustic fields. In this study, an acousto-optic holography method is proposed in which the sound pressure in the near field of a source is captured via acousto-optic sensing. The acousto-optic measurements are expanded into propagating and evanescent waves, as in near-field acoustic holography, making it possible to completely characterize the radiated field noninvasively. An algebraic formulation of the wave expansion enables the use of arbitrary sets of projections. The proposed method is demonstrated experimentally by capturing the acoustic field radiated by a vibrating plate. Accurate holographic reconstructions of the pressure, particle velocity, and intensity fields are obtained using purely optical data. These results are particularly significant for the study of sound fields at mid and high frequencies, where using conventional transducers could perturb the measured field and spatial sampling requirements are challenging.

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“…To obtain a 3D sound field from optical measurements, numerical reconstruction must be performed because the observed optical signals are proportional to the line integral of sound pressure. Computed tomography (CT) is the most typically used technique [1,[13][14][15][16][17][18][19], and a physical modelbased algorithm has been proposed recently [20]. The reconstruction of a 3D sound field generally requires measurements of two-dimensional (2D) integrated fields from multiple angles, thereby necessitating the rotation of either measurement instruments or a sound field.…”

Section: Introductionmentioning

confidence: 99%

Physical-model-based reconstruction of axisymmetric three-dimensional sound field from optical interferometric measurement

Ishikawa

Yatabe

Oikawa

2020

Meas. Sci. Technol.

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Optical interferometric measurement methods for sound fields have garnered considerable attention owing to their contactless nature. The capabilities of non-invasive measurement and reconstruction of three-dimensional sound fields are significant for characterizing acoustic transducers. However, three-dimensional reconstructions are typically time consuming because of the two-dimensional scanning and rotation of the measurement system. This paper presents a scan and rotation-free reconstruction of an axisymmetric sound field in the human hearing range. A physical-model-based algorithm is proposed to reconstruct an axisymmetric sound field from optical interferograms recorded using parallel phase-shifting interferometry and a high-speed polarization camera. We demonstrate that audible sound fields can be reconstructed from data measured in 10 ms. The proposed method is effective for the rapid evaluation of axially symmetric acoustic transducers.

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Sound Field Measurements Based on Reconstruction from Laser Projections

Cited by 18 publications

References 5 publications

Sound field reconstruction: towards large-scale spatial sensing

Sound field reconstruction: towards large-scale spatial sensing

Acousto-optic holography

Physical-model-based reconstruction of axisymmetric three-dimensional sound field from optical interferometric measurement

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