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针对机械式扫描激光多普勒测速技术(LDA)存在的缺陷.利用声光互作用中衍射光束的偏转效应来实现激光束扫描.构成的声光扫描LDA系统不存在任何运动的光学元件.克服了机械扫描LDA存在惯性影响带来的局限性.应用于人工心瓣返流瞬态流速分布的测定.所获得的实验结果为评定二尖瓣替代物返流特性提供了可信的依据.
Aiming at the shortcomings of laser scanning laser Doppler velocimetry (LDA), the laser beam scanning is realized by the deflection effect of the diffracted beam in the acousto-optic interaction, and there is no moving optical element in the acousto-optic scanning LDA system. The limitation of inertial influence of mechanical scanning LDA was applied to determine the transient flow velocity distribution of prosthetic heart valve regurgitation.The experimental results obtained provided a credible basis for assessing the regurgitation characteristics of mitral valve replacement.