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在目前国际通用的三束双色激光测速仪光路系统的基础上，将绿光（λ＝５１４．５ｍｍ）与混合光交换位置，使蓝光（λ＝４８８ｎｍ）与混合光同布于聚焦透镜的直径上，构成新的测速平面的激光测速光路，特别适用于测量二平行壁面间深宽比大、缝隙狭窄的流场，如环隙科特流、叶片机械内流场等，实现一次测量，即可获得二壁面间相当完整的流场信息。
On the basis of the optical system of three-beam two-color laser velocimeter currently in the world, the green light (λ = 514.5mm) is exchanged with the mixed light so that the blue light (λ = 488nm) and the mixed light are distributed uniformly on the diameter of the focusing lens , The new laser velocity measuring optical path of the speed measurement plane is especially suitable for measuring the flow field with large aspect ratio and narrow gap between two parallel walls, such as the annular gap cite flow and the blade mechanical inflow field, so as to realize a measurement, that is, Get fairly complete flow field information between two walls.