基于希尔伯特-黄变换测量超声导波的群速度及材料厚度

Measurements of group velocity of ultrasonic guided waves and thickness of material based on Hilbert-Huang transform

采用超声导波的速度评价长骨状况是近年来的一个研究热点。提出了采用希尔伯特黄变换法分析长骨仿体中超声导波模式的群速度,并由群速度得到长骨仿体厚度。研究结果表明,实验测得的厚度与实际厚度相吻合,说明希尔伯特黄变换(HHT)可用于测量超声导波的群速度及其被测材料的厚度。

Ultrasonic evaluation of long bone based on measurements of the propagation velocity of guided waves becomes an attractive topic in recent years. Hilbert-Huang transform is used to analyze the group velocity of multiple guided waves in long bone phantoms, and the thickness of long bone phantoms can be obtained by the group velocity. The results suggest that the ultrasonic determined thickness is in agreement with the actual thickness. Hilbert-Huang transform can be provided for the measurement of the group velocity of the guided waves and the thickness of the measured material.