Ultrasonic wave has been widely used in the medical field because of its special physical properties. However, it might cause health risk for the human body if the power is inaccurately measured. As a noncontact measurement method, the acousto-optic method gives a lower uncertainty than the mechanical and contact method. To improve the accuracy of ultrasonic power measurement system based on the acousto-optic effect, we optimized the image processing algorithms by adjusting the threshold of binarization, optimizing the centroid coordinates calculation method, and rectangular areas division method. The results showed that the measurement of uncertainty of the acousto-optic method was lower than the radiation balance method, and the accuracy of the measurement system based on the acousto-optic effect was improved from 79.59 to 96.17% after algorithm optimization.

超声波由于其特殊的物理特性已被广泛用于医疗领域。但是，如果功率测量不正确，则可能对人体造成健康风险。作为一种非接触式测量方法，声光法比机械和接触法具有更低的不确定性。为了提高基于声光效应的超声功率测量系统的精度，我们通过调整二值化阈值，优化质心坐标计算方法和矩形区域划分方法来优化图像处理算法。结果表明，声光法测量不确定度低于辐射平衡法，基于声光效应的测量系统的精度从79.59提高到96。