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    • 50. 发明授权
    • Method and apparatus for ascertaining the magnitude and direction of the
flow speed in a flowing medium
    • 用于确定流动介质中的流速的大小和方向的方法和装置
    • US4206999A
    • 1980-06-10
    • US886350
    • 1978-03-14
    • Andreas Keller
    • Andreas Keller
    • G01P5/26G01P3/36
    • G01P5/26
    • The invention relates to a method for determining the magnitude and direction of the flow speed in a flowing medium comprising the following steps:(a) Irradiating the flowing medium in a first direction with a laser beam of a defined cross-section having a maximum principal dimension;(b) Observing a defined position (measured volume) in the longitudinal extent of the laser beam in a second direction at a defined angle to the first direction;(c) Measuring the pulse duration of diffuse light pulses given off in the second direction by particles of a defined size contained in the flowing medium and passing through the measured volume; and(d) Turning the laser beam cross-section about the rotary axis defined by the first direction until diffuse light pulses of maximum pulse duration can be observed.By means of this method one obtains in a single measuring operation an indication of the magnitude and direction of flow in the plane formed by the laser beam and the flow direction.
    • 本发明涉及一种用于确定流动介质中的流速的大小和方向的方法,包括以下步骤:(a)用具有最大主体的限定横截面的激光束沿第一方向辐射流动介质 尺寸; (b)以与第一方向限定的角度在第二方向观察激光束的纵向范围内的限定位置(测量体积); (c)通过包含在流动介质中并通过测量体积的具有规定尺寸的颗粒在第二方向上测出漫射光脉冲的脉冲持续时间; 和(d)旋转围绕由第一方向限定的旋转轴的激光束横截面,直到观察到最大脉冲持续时间的漫射光脉冲。 通过该方法,在单个测量操作中获得由激光束和流动方向形成的平面中的流动的大小和方向的指示。