Measurement of Sound Fields Using Mach–Zehnder Interferometer
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概要
- 論文の詳細を見る
In this paper, we propose a method of noncontact measurement of sound fields, radiating from an ultrasonic transducer, using a Mach–Zehnder interferometer. The deviation of refractive index, which depends on sound pressure, was transformed into the intensity of the interference light using the interferometer, in which a light beam passes through the measured object. Projection data used in the computerized tomography (CT) method along the optical axis was obtained by single linear scanning in the range of $\pm 40$ mm and was electronically quadrature-detected as the complex amplitude. The 36 projections were acquired by the rotation of the sound fields in the range of $0\leq\theta\leq\pi$ (rad) with an interval of $\pi/36$ rad. Finally, the complex sound fields were reconstructed in the region of $48\times 48$ mm2 by the CT method. The plane of reconstruction was 5 mm apart from the plane of the transducer. The ultrasonic transducer used in the experiment was driven at a frequency of 1.416 MHz and had a diameter of 8.0 mm. The experimental results were approximately in agreement with the numerical results.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2004-09-15
著者
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Masuyama Hiroyuki
Electronic Mechanical Engineering Department Toba National College Of Maritime Technology
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Nemoto Manabu
Graduate School Of Science And Engineering University Of Tsukuba
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Ezure Tomohiro
Graduate School Of Engineering University Of Tsukuba
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Mizutani Koichi
Graduate School Of Systems And Information Engineering Univ. Of Tsukuba
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Masuyama Hiroyuki
Electronic Mechanical Engineering Department, Toba National College of Maritime Technology, Toba 517-8501, Japan
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Nemoto Manabu
Graduate School of Science and Engineering, University of Tsukuba, Tsukuba Science City 305-8573, Japan
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Ezure Tomohiro
Graduate School of Engineering, University of Tsukuba, Tsukuba-Science City 305-8573, Japan
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Mizutani Koichi
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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