期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 164, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2021.108223
关键词
Terahertz NDT; Dispersion Compensation; Double Overcomplete Dictionaries; Convex Optimization Technique
资金
- National Natural Science Foundation of China [51805414]
- Science and Technology Innovation Committee of Shenzhen Municipality [JCYJ20180306170652664]
- Zhejiang Provincial Natural Science Foun-dation of China [LZ19A020002]
A novel dispersion compensation strategy based on the double Gaussian mixture model (DGMM) is proposed to suppress the dispersion effect in THz echoes, providing an effective approach for improving the accuracy of THz detection in nondestructive testing applications.
Terahertz (THz) time-domain pulse detection technique has recently attracted great attention in the nondestructive testing (NDT) field due to its superior detection accuracy and sensitivity for various non-metallic materials. However, the dispersion of the THz wave in the tested material significantly degrades the temporal and spatial resolution of THz detection, which limits its practical applications in the high-resolution measurement. Here, a novel dispersion compensation strategy based on the double Gaussian mixture model (DGMM) is proposed to suppress the dispersion effect in THz echoes. The double overcomplete dictionaries composed of one parametric dispersion dictionary and one parametric non-dispersion dictionary are designed separately by discretizing the estimated parameter vector from observed THz echoes. To obtain the excellent performance of dispersion compensation, the convex optimization technique is employed to sparsely decompose the observed dispersive THz echoes by the appropriate selection of the optimal regularization parameter. Both numerical simulations and experiments can validate the effectiveness of proposed method for the non-overlapping and overlapping dispersive THz echoes.
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