A study on the terahertz nondestructive testing of foam sandwich structure composites based on morphological filtering

Zhilong Li; Jian Zuo; Yuanmeng Zhao; Zhongde Han; Zhihao Xu; Yunzhang Zhao; Chao Yang; Weidong Hu; Cunlin Zhang

doi:10.1117/12.2606883

24 November 2021 A study on the terahertz nondestructive testing of foam sandwich structure composites based on morphological filtering

Zhilong Li, Jian Zuo, Yuanmeng Zhao, Zhongde Han, Zhihao Xu, Yunzhang Zhao, Chao Yang, Weidong Hu, Cunlin Zhang

Author Affiliations +

Proceedings Volume 12065, AOPC 2021: Optical Sensing and Imaging Technology; 1206538 (2021) https://doi.org/10.1117/12.2606883
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

A new method for defect recognition of foam sandwich structure composites based on morphological filtering is proposed in this paper. Firstly, the terahertz frequency modulated radar imaging system is used to detect the foam sandwich structure composites to obtain the original detection signal, and the original detection image is obtained by using amplitude imaging method. Secondly, the original detection images are transformed to binary images by setting threshold values. Thirdly, based on the morphological filtering theory we carry out closing operation to fill the inner tiny holes in the binary images, and connect the discontinuous adjacent targets. Finally, the opening operation is used to remove the redundant small objects in the image, and obtain the final detection result image. In this paper, the imaging detection of polymethacrylimide foam sandwich structure composites is carried out, and the original detection signal is processed by using the above method, the resulting images with the prefabricated defect effectively recognized is obtained.The accuracy of the proposed method for defect recognition is evaluated by calculating and comparing the error ratio of the defect area in the processed image and the original detection image relative to the actual defect area.The results show that the proposed method can effectively recognized the prefabricated defects in foam sandwich structure composites and optimize the size of the defects to be close to the actual defects, which is conducive to the further application of terahertz nondestructive testing technology in foam sandwich structure composites.

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Zhilong Li, Jian Zuo, Yuanmeng Zhao, Zhongde Han, Zhihao Xu, Yunzhang Zhao, Chao Yang, Weidong Hu, and Cunlin Zhang "A study on the terahertz nondestructive testing of foam sandwich structure composites based on morphological filtering", Proc. SPIE 12065, AOPC 2021: Optical Sensing and Imaging Technology, 1206538 (24 November 2021); https://doi.org/10.1117/12.2606883

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KEYWORDS

Foam

Adhesives

Composites

Binary data

Image filtering

Nondestructive evaluation

Image processing

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