Three dimensional laser Doppler velocimeter
    2.
    发明授权
    Three dimensional laser Doppler velocimeter 失效
    三维激光多普勒测速仪

    公开(公告)号:US4148585A

    公开(公告)日:1979-04-10

    申请号:US767883

    申请日:1977-02-11

    IPC分类号: G01P5/26 G01P3/36

    CPC分类号: G01P5/26

    摘要: A laser Doppler velocimeter which can measure fluid flow in three dimensions, employing a laser beam projected through a rotating diffraction grating and spaced lenses, with a beam splitter in the major optical path between two lenses ahead of the flow channel through which the fluid passes. Selected pairs of laser-derived beams are directed through the fluid and intersect at a predetermined point in the fluid. The movement of the particles through interference patterns formed by the intersecting laser-derived beams generates further-modulated scattered light, which is focused on a photomultiplier tube, from the output of which a fluid velocity directional component signal is derived for each pair. There are four laser-divided beams, and different pairs of these beams can be selected, to provide measurements from which the components of the fluid velocity along three mutually orthogonal directions can be derived.

    摘要翻译: 一种激光多普勒测速仪,其可以使用通过旋转衍射光栅投射的激光束和间隔开的透镜来测量三维流体流动,其中分束器在流体通过的流动通道之前的两个透镜之间的主光路中。 所选择的一对激光衍生的光束被引导通过流体并在流体中的预定点处相交。 通过由相交的激光衍生的光束形成的干涉图案,颗粒的运动从其输出中产生进一步调制的散射光,该散射光聚焦在光电倍增管上,其输出对于每对导出流体速度方向分量信号。 有四个激光分束,并且可以选择不同对的这些光束,以提供可以从中导出沿着三个相互正交的方向的流体速度的分量的测量。