Doppler Measurement of Moving Object Across the Ultrasonic Field Radiated from Circular Planar Transducer.
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概要
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We improve the procedure for measuring the velocity component of a moving object perpendicular to the direction of ultrasonic wave propagation. The conventional procedure uses a concave transducer. We adopt a circular planar transducer. The use of the transducer offers advantages. The both ranges of the distances between the path of the moving object and the transducer and between the path and the central axis of the transducer could be extended by using not the converging beam but the radiating one. However, this degrades the accuracy of the measurement. We derive the equation approximately representing the relationship between the velocity across the field radiated from the planar transducer and the bandwidth of the reflected wave. Then the field is exactly calculated for a concrete example to estimate the accuracy of the approximation. Finally an experiment is performed to confirm the validity of the discussion.
- 公益社団法人 応用物理学会の論文
公益社団法人 応用物理学会 | 論文
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