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介绍2种在应用双光束激光多普勒测速仪测量弯管内流速时，修正测量体位置和光束之间夹角的计算方法。一种是Snell折射定律的简化近似法，而另一种是精确的光线追踪法。针对弯管实例，将这2种方法所得的结果相比较，可看出近似法的不足是对三维折射的修正不够充分，然而与在直管中折射效应的测量结果相比较，证明这2种修正方法均是可行的。
This paper introduces two methods to correct the angle between the measuring object and the light beam when measuring the flow velocity in the elbow by using the double beam laser Doppler velocimeter. One is a simplified approximation of Snell’s law of refraction, and the other is an exact ray tracing method. For the example of elbow, comparing the results obtained by these two methods, it can be seen that the deficiency of the approximate method is that the correction of three-dimensional refraction is not sufficient. However, compared with the measurement results of the refraction effect in straight pipe, it is proved that the two methods The correct method is feasible.