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A baseline-free damage localization method for multisource excited crosstalk using mixed copula function
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DOI：10.1088/1361-665X/ae0773.png)
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Abstract
En 中文
Nondestructive testing (NDT) systems are critical for structural lifecycle management, yet existing algorithms struggle to address the challenges of distributed multisource systems, particularly crosstalk interference during large-area inspections. This study introduces an innovative damage detection and localization method tailored for fiber-based distributed ultrasonic excitation that uniquely enables lightweight, large-area coverage through multipoint excitation via a single optical fiber. To overcome the limitations of conventional approaches in handling distributed signal correlations, we propose a hybrid binary copula framework that optimizes copula hybridization to minimize fitting errors and precisely characterize signal dependencies. This method quantifies damage effects through correlation coefficient analysis and a novel correlation index, synergistically integrated with an energy index to form a baseline-free damage index that amplifies damage-induced signal variations. By eliminating the reliance on baseline data, this approach addresses a major bottleneck in scalable NDT applications. Experimental validation on a 2000 mm × 1000 mm × 0.5 mm aluminum plate demonstrated the system’s high-precision capability, successfully locating three coexisting damages with an average absolute error of 3.83 mm (0.31% relative error). The fusion of hybrid copula modeling and baseline-independent quantification establishes a paradigm shift for distributed NDT systems, balancing expansive coverage with sub-centimeter accuracy, which is a critical advancement in next-generation infrastructure maintenance.
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