声光扫描激光测速研究

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.

Investigation of Acousto-optic Scanning Laser Anemometry

In order to overcome the inherent weakness in the mechanical scanning laser Doppler anemometry (LDA) system, the laser beam scanning was realized by means of the deflection of the diffracted laser beam occuring in the acousto-optic interaction to construct an acousto-optic scanning LDA (AOS-LDA). Because there are no any movable or rotational optical elements in the AOS-LDA, the limitations induced by mechanical inertia was then eliminated. The instantaneous regurgitant velocity profiles obtained from the mitral heart valve prothesis (MHVP) test installed in a mock circulatory loop can be used to evaluate the regurgitation characteristic of the MHVP in vitro.