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激光多普勒测速系统是用一束单色激光照射到流体中的杂质质点上,测出其散射光的多普勒频移,然后换算成流体的速度。比之热线风速计等这项技术的主要优点是能测出流体中很小范围内的局部速度,而又不扰动原来的流动。本文着重评论了这种光学方法的基本原理、光学系统、它的理论模型、和讯号检测系统;分析了系统参数对信号强度、空间分辨率和测量精度的影响;还指出了此光学方法目前的应用和将未的发展方向。
Laser Doppler velocimetry system is a monochromatic laser beam impinging on the impurities in the fluid particle, measuring the Doppler shift of the scattered light, and then converted to fluid velocity. The main advantage of this technology over hotline anemometers is the ability to detect local velocity over a small area of the fluid without disturbing the original flow. The paper mainly reviews the basic principle of this optical method, the optical system, its theoretical model and the signal detection system. The influence of the system parameters on the signal intensity, the spatial resolution and the measurement accuracy is also analyzed. At the same time, Application and will not be the direction of development.