一様音源から放射された非線形伝搬集束波の凹面受波器による検出
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概要
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The property of the fundamental and second harmonic components of the acoustic pressure in the beam emitted from a uniformly excited focusing source, which is detected by a concave receiver put normal to the acoustic axis beyond the focal region, has been investigated for both the cases of the free field and the field with inserted sample. Calculation based on the successive approximation solution for the Khokhlov-Zabolotskaya-Kuznetsov equation is validated through experiments. It has been clarified that the range dependence of the fundamental component amplitude differs from that of the second harmonic, unlike the case of a Gaussian source, and the cancellation of the second harmonic components generated in front of and beyond the focal region is degraded comparing with the case of Gaussian source. The signal experimentally received beyond the sample corresponds fairly well with the theoretical prediction, taking into account the acoustic properties of the inserted sample. However, the result of experimental determination of the B/A utilizing such responses shows slightly poorer agreement with the literature values, due to the less sensitive property of the second harmonic component to the inserted sample.
- 社団法人日本音響学会の論文