Abstract
We propose a method for the noncontact visualization of ultrasonic fields using the Michelson interferometer and optical computerized tomography (O-CT). The light source of the interferometer is a He–Ne laser. The test light passing through radiated sound fields is interfered by the reference light. Therefore, the index of refraction gradient including sound pressure information is transformed into the intensity of the interference light that can be electrically acquired by an avalanche photo-diode. Projection data along the optical axis is obtained by single linear scanning in the range of ±32 mm and electronically quadrature-detected as complex amplitude. Thirty-six projections are acquired in the range of 0≤θ<π (rad), and complex sound fields are reconstructed in a region of 64×64 mm2 by CT. The experimental results are in agreement with the numerical results.
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