Luxemburg-Gorky effect in a granular medium: Probing perturbations of the material state via cross-modulation of elastic waves
Luxemburg-Gorky effect in a granular medium: Probing perturbations of the material state via cross-modulation of elastic waves
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颗粒介质中的卢森堡-高尔基效应：通过弹性波的交叉调制探测材料状态的扰动
DOI：
10.1209/epl/i2005-10023-5
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发表时间：
2005
期刊：
影响因子：
1.8
通讯作者：
B. Castagnède
中科院分区：
文献类型：
--
作者：
V. Zaitsev;V. Nazarov;Vincent Tournat;V. Gusev;B. Castagnède
最近通过与无线电波的类比，在非线性声学中引入了一种非线性效应，该效应包括从一个调幅弹性波（“泵浦”波）到第二个初始单色探测波的调制传递。这种效应首次应用于探测由冲击（“地震事件”）引起的粒状材料状态的扰动。实验表明，与探测波和泵波基频分量的变化相比，非线性引起的调制旁瓣的可变性要强得多。实验中揭示的另一个新特征是，过渡冲击引起的调制旁瓣幅度变化比变化的松弛残差值强几倍。观察到的效果表明在主动声学/地震监测方案中应用的有趣可能性。
A nonlinear effect consisting of transfer of modulation from one amplitude-modulated elastic wave, the "pump" wave, to the second initially monochromatic probe wave has been recently introduced in nonlinear acoustics by analogy with radio waves. For the first time, this effect is applied to probe perturbations of the state of a granular material induced by shocks, "seismic events". The experiments indicate a much stronger variability of the nonlinearity-induced modulation sidelobes in comparison with changes in the components at the fundamental frequencies of the probe and pump waves. Another new feature revealed in the experiments is that the transitional shock-induced variations in the amplitudes of the modulation sidelobes are several times stronger than the relaxed, residual values of the changes. The effects observed suggest interesting possibilities to application in active acoustic/seismic monitoring schemes.