Abstract The resonance characteristics of elastic acoustic scattering play an important role for buried target detection and identification. Taking a stainless steel sphere as the target, the acoustic scattering of the target under free-field and buried conditions are calculated using the corresponding COMSOL models. The influences of the burial layer on the Rayleigh wave and Whispering-Gallery wave are analyzed using the partial-wave representation of the form function and the dispersion curve. Compared to the scattering in free-field, the Rayleigh resonance peaks are significantly suppressed under the considered burial layer, while less affecting the Whispering-Gallery resonances. The method of isolation and identification of resonance (MIIR) is used to process the experimental data and hence the elastic resonances in free-field and buried conditions are obtained. The elastic resonances obtained in free-field are mainly Rayleigh resonance peaks, while the Whispering-Gallery resonances are the elastic characteristics under the buried condition. Moreover, using the fitting analysis of the two types of resonances, the calculated expressions for the target radius estimation under the two conditions are obtained, and verified from experimental results.

中文翻译：

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埋藏不锈钢球的声散射：理论分析和实验验证

摘要 弹性声散射的共振特性对埋藏目标的探测和识别具有重要作用。以不锈钢球体为目标，利用相应的 COMSOL 模型计算目标在自由场和埋地条件下的声散射。利用形函数的分波表示和频散曲线分析埋藏层对瑞利波和回音廊波的影响。与自由场中的散射相比，瑞利共振峰在所考虑的掩埋层下被显着抑制，而对 Whispering-Gallery 共振的影响较小。共振的隔离和识别（MIIR）方法用于处理实验数据，从而获得自由场和埋地条件下的弹性共振。在自由场中获得的弹性共振主要是瑞利共振峰，而耳语回廊共振是埋藏条件下的弹性特性。此外，通过对两种共振类型的拟合分析，得到了两种条件下目标半径估计的计算表达式，并通过实验结果进行了验证。