研究目的
To present a systematic approach using a hierarchical inspection scheme for automatic inspection processes in nondestructive testing (NDT) with a newly created frequency band divider (FBD) for quick examination of various frequency ranges.
研究成果
The hierarchical inspection scheme with the FBD significantly reduces the number of scans required to determine the optimal frequency range for unknown specimens, enhancing the robustness and practicality of laser ultrasonic methods for complex aerospace composite structures.
研究不足
The study is limited to the inspection of composite and metallic specimens with artificial defects. The effectiveness of the FBD and hierarchical inspection scheme in real-world applications with natural defects and varying material properties requires further investigation.
1：Experimental Design and Method Selection:
The study employs a hierarchical inspection scheme with a frequency band divider (FBD) for automatic inspection processes. The FBD is integrated into a pulse-echo ultrasonic propagation imaging (PE UPI) system for noncontact laser ultrasonic inspection.
2：Sample Selection and Data Sources:
Two specimens were used: an aluminum honeycomb sandwich and a composite repair patch with artificial defects.
3：List of Experimental Equipment and Materials:
The PE UPI system (X-NDT Inc.), a frequency band divider (FBD), and specimens with artificial defects.
4：Experimental Procedures and Operational Workflow:
The system scans the specimens with coincident excitation and sensing beams, processes the signals through the FBD, and visualizes the results on a graphical user interface (GUI).
5：Data Analysis Methods:
The study compares the signal-to-noise ratio (SNR) of the FBD with commercial filters and evaluates defect visibility across different frequency bands.
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