基于光流法的固体内部声传播方向测量

Measurement of acoustic propagation direction in solids based on optical flow method

目前采用光弹设备测量超声传播方向多为人眼主观观测,其误差较大,难以实现精确的定量测量。将Farneback光流法应用于光弹图像的处理,并根据帧与帧之间的光流图来计算光弹图像中的超声传播方向,可以捕捉图像中的动态声场。在实验中对不同传播方向的超声进行了测量,其绝对偏差度数最大值为2.85°,测量结果较为准确。因此,Farneback光流法可用于光弹图像中声波传播方向的判断,且具有快速、准确和直观等特点。

At present, the measurement of ultrasonic propagation direction by photoelastic equipment is mostly subjective observation of human eyes, the error is large, so it is difficult to achieve accurate quantitative measurement. By applying the Farneback optical flow method to photoelastic image processing, and using the optical flow diagram between frames to calculate the ultrasonic propagation direction in the photoelastic image, the dynamic sound field in the image can be captured. In the experiment, the ultrasonic waves in different propagation directions are measured with a maximal absolute deviation degree of 2.85°, and the measurement results are more accurate. Therefore, the Farneback optical flow method can be used to judge the direction of sound wave propagation in a photoelastic image with the characteristics of rapid, accurate and intuitive.