Terahertz non-destructive testing technique based on the thickness of the adhesive layer of aerospace ceramic glued structural parts estimation method

Shujie Wang; Jianxin Tang; Xiangdong Li; Xiuwei Yang; Guang Yan

doi:10.1117/12.2648554

20 January 2023 Terahertz non-destructive testing technique based on the thickness of the adhesive layer of aerospace ceramic glued structural parts estimation method

Shujie Wang, Jianxin Tang, Xiangdong Li, Xiuwei Yang, Guang Yan

Author Affiliations +

Proceedings Volume 12555, AOPC 2022: Infrared Devices and Infrared Technology; and Terahertz Technology and Applications; 1255502 (2023) https://doi.org/10.1117/12.2648554
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

Precision ceramic bonded structural parts have an irreplaceable position in the aerospace business and are widely used in various industries due to their various advantages, but at the same time, the uneven thickness of the adhesive layer will affect the quality of ceramic adhesive structural par. In this paper, terahertz time-domain spectroscopy is used for nondestructive detection of the adhesive layer inside the sample, and the thickness information is reconstructed from the experimental data using an autoregressive spectral extrapolation method based on improved covariance, and the difference in the time of flight of the echoes on the upper and lower surfaces of the adhesive layer is used to find the thickness of the adhesive layer. This paper analyzes the thickness of the adhesive layer of 0.5mm and 1mm respectively, and finally gets the error rate of 7.2% and 6.3%. This error rate is basically in line with the quality of the product and provides reliable technical support for the aerospace business.

Citation Download Citation

Shujie Wang, Jianxin Tang, Xiangdong Li, Xiuwei Yang, and Guang Yan "Terahertz non-destructive testing technique based on the thickness of the adhesive layer of aerospace ceramic glued structural parts estimation method", Proc. SPIE 12555, AOPC 2022: Infrared Devices and Infrared Technology; and Terahertz Technology and Applications, 1255502 (20 January 2023); https://doi.org/10.1117/12.2648554

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KEYWORDS

Adhesives

Ceramics

Autoregressive models

Terahertz radiation

Terahertz spectroscopy

Data modeling

Nondestructive evaluation

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