Certon D, Ferin G, Bou Matar O, Guyonvarch J, Remenieras J P, Patat F
LUSSI/GIP Ultrasons EA 2102, 2 bis boulevard Tonnellé, 37032 Tours Cedex, France.
Ultrasonics. 2004 Apr;42(1-9):465-71. doi: 10.1016/j.ultras.2003.12.035.
This paper deals with the influence of acousto-optic interactions on the displacement measurements performed over transducer array and their effects on the predicted diffraction field. Changes on the temporal/spatial responses and the plane wave decomposition of the displacement are discussed. Modifications made on the directivity pattern are shown. A theoretical analysis of acousto-optic phenomenon, based on the plane wave decomposition of radiated field by the array is developed. Theoretical and experimental results are compared, showing first that waves with phase velocity near the one of the fluid are greatly amplified. Second, the interaction of laser beam with edge wave produced by the vertical size of elements induces a parasitic temporal pulse on the x-t diagram and so an interference pattern in the omega-k diagram. Corrections are proposed to eliminate errors induced by acousto-optic interactions and validated by comparing predicted diffraction field with measurements.
本文探讨了声光相互作用对在换能器阵列上进行的位移测量的影响及其对预测衍射场的作用。讨论了位移的时空响应和平面对波分解的变化。展示了对阵列方向图所做的修改。基于阵列辐射场的平面对波分解，开展了对声光现象的理论分析。对理论结果与实验结果进行了比较，结果首先表明，相速度接近流体相速度的波会被大幅放大。其次，激光束与由元件垂直尺寸产生的边缘波的相互作用在x-t图上诱发了寄生时间脉冲，从而在ω-k图上产生干涉图样。提出了校正方法以消除声光相互作用引起的误差，并通过将预测衍射场与测量结果进行比较进行了验证。
