TY - GEN
T1 - The effects of frequency-dependent amplitude characteristic on testing resolution of ultrasonic guided waves
AU - Zeng, Liang
AU - Lin, Jing
AU - Gao, Fei
AU - Luo, Zhi
N1 - Publisher Copyright:
© 2016 IEEE.
PY - 2016/12/21
Y1 - 2016/12/21
N2 - High resolution and accurate location are the crucial goals associated with the application of guided waves for nondestructive testing purposes. In this paper, through experimental studies, the influences of the frequency-dependent amplitude to the testing resolution of guided wave methods are investigated. Firstly, the factors which result in frequency dependency to the amplitude characteristic of guided wave modes are investigated. Then, the influences of the frequency-dependent amplitude to the spectrum of guided wave mode propagating in the structure are analyzed. The results show that it brings amplitude modulation to guided wave modes, resulting in peak frequency shifting and bandwidth variation in their spectra. This spectrum distortion affects the wave form of the received wave packet (i.e., time duration), and further the testing resolution of guided wave modes. Ultimately, two simple and universal experimental cases are introduced to verify and illustrate these effects. The results show that because of the frequency-dependent amplitude, the testing resolution of guided wave modes is still limited even when either time reversal technique or dispersion compensation is applied.
AB - High resolution and accurate location are the crucial goals associated with the application of guided waves for nondestructive testing purposes. In this paper, through experimental studies, the influences of the frequency-dependent amplitude to the testing resolution of guided wave methods are investigated. Firstly, the factors which result in frequency dependency to the amplitude characteristic of guided wave modes are investigated. Then, the influences of the frequency-dependent amplitude to the spectrum of guided wave mode propagating in the structure are analyzed. The results show that it brings amplitude modulation to guided wave modes, resulting in peak frequency shifting and bandwidth variation in their spectra. This spectrum distortion affects the wave form of the received wave packet (i.e., time duration), and further the testing resolution of guided wave modes. Ultimately, two simple and universal experimental cases are introduced to verify and illustrate these effects. The results show that because of the frequency-dependent amplitude, the testing resolution of guided wave modes is still limited even when either time reversal technique or dispersion compensation is applied.
KW - Amplitude
KW - Frequency dependency
KW - Guided wave
KW - Nondestructive testing
KW - Testing resolution
UR - https://www.scopus.com/pages/publications/85010070511
U2 - 10.1109/IECON.2016.7793034
DO - 10.1109/IECON.2016.7793034
M3 - 会议稿件
AN - SCOPUS:85010070511
T3 - IECON Proceedings (Industrial Electronics Conference)
SP - 463
EP - 468
BT - Proceedings of the IECON 2016 - 42nd Annual Conference of the Industrial Electronics Society
PB - IEEE Computer Society
T2 - 42nd Conference of the Industrial Electronics Society, IECON 2016
Y2 - 24 October 2016 through 27 October 2016
ER -