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激光－超声方法是通过测量由流动引起的超声脉冲信号在两束或更多来激光之间传递的时间差实现旋涡场测量的。该方法的一个显著特点是无需在流场中注入粒子，可以对流场中任何一点（包括涡核处）进行准确测量。适合研究旋涡的破裂和稳定性问题，获得有关旋涡场的速度、涡量及环量分布。对函道风扇流场的测量结果表明，该方法可以准确获得流场的速度分布，给出流场的旋转结构。
The laser-sonography method measures the vortex field by measuring the time difference of the transmitted ultrasonic pulse signal between two or more lasers. A notable feature of this method is that it eliminates the need to inject particles into the flow field and allows accurate measurements at any point in the flow field, including the vortex core. Suitable for the study of the vortex rupture and stability problems, get the vortex field velocity, vorticity and circulation distribution. The measurement results of the fan flow field show that this method can accurately obtain the velocity distribution of the flow field and give the rotating structure of the flow field.