简介：Asetofcoupledwaveequationsofacoustoopticdiffractionwithmultipleacousticwavesalongdifferentdirectionsisputforwardandits,solutionsarederived.Thecharacteristicsofthediffractionefficiency,com-pression,crossmodulation,andintermodulationintensitiesareanalyzedtheoretically.Thetheoreticalresultsaresupportedbyexperimentalmeasurementsthroughournewmultipledirectionalacoustoopticdevices.

简介：电磁的超声在粘合剂的接口的察觉被使用在由传统的压电的变换器的超声的测试解决不稳定的联合问题的多层的结构。从变换器的相互的电感基于电磁的超声精力和结果的死了的地区的转变机制的分析，由取消方法的软阀值、适应的噪音过滤的小浪同时被使用到检测电磁的超声的信号克服低信号的缺点到噪音比率(SNR)和变换器的宽内在的死了的地区。当取消的适应噪音有效地缩小死了的地区时，在钢和橡胶材料的三件分层的粘合剂样品的接口察觉的处理结果证明过滤的小浪关于12dB提高SNR。

简介：从在无限的声学的媒介沉浸的有限的圆柱的壳的健全放射上的多重顺从的层的效果被学习。转移矩阵在多层的system.With的每个邻近的接口根据连续边界条件被导出壳理论和声学的波浪方程，理论模型被开发估计声音的特征放射。声学的放射力量减小的数量作为波浪速度或顺从的层减少的密度增加的数字计算结果表演，和使用的多层的系统能比相应一致单身者在噪音减小上是更有效的层。

简介：Withtheincreasingofdetectionabilityofpassivesonar,theweaksignaldetectionprobleminmultipleinterferencesbecomesmoreandmoreimportant.Inthetime/bearingrecord(TBR)displayofsonardetection,whenthereexisttracesofmultipleinterferences,theidentificationofweaksignalisdifficultorimpossible.Theadaptivenoisecancellationtechniqueprovidesthetheoreticalbasisforsuppressingstronginterferences.Butthesolutionforfindingthesteady-stateoptimumfiltermatrixisquitedifficultduetotherealtimecalculationofinversematrixofinputdatacorrelationmatrix.Theiterativeinversebeamforming(IBF)algorithmforsolvingtheoptimumfiltervector,whichisexpressedbyinversematrixoftheoceanenvironmentdata,isderivedinthispaper,bywhich,theoptimumfiltercanbeeventuallyexpressedasasumofseriessimplematricesofconstructedfromsensordata.Basedonthealgorithmproposedinthispaper,someexamplesofatseaexperimentareprovided.Thestronginterferencesarecancelledandtheweaksignalisemerged,evenitdidn'tappearintheconventionalbeamforming(CBF)processing.