Nondestructive Detection Method for Multi-layer Packaging Structures Based on Terahertz Time-Domain Spectroscopy

KANG Kai; WU Wangjie; ZHANG Xiaochuan; SUO Yijin

doi:10.19554/j.cnki.1001-3563.2026.07.017

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (7) : 140-148. DOI: 10.19554/j.cnki.1001-3563.2026.07.017

Automatic and Intelligent Technology

Nondestructive Detection Method for Multi-layer Packaging Structures Based on Terahertz Time-Domain Spectroscopy

KANG Kai^*, WU Wangjie, ZHANG Xiaochuan, SUO Yijin

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Abstract

The work aims to address the challenge of balancing nondestructiveness, speed, and accuracy in measuring internal structure parameters and detecting defects of multi-layer packaging. A detection scheme based on Terahertz Time-Domain Spectroscopy (THz-TDS) was proposed. Firstly, a transmission-based THz experimental system was set up to collect time-domain and frequency-domain signals of two typical plastics (PET and PC) in different thicknesses and multi-layer packaging structures, and a thickness inversion model based on flight time and frequency-domain phase was established and the algorithm was optimized. Then, a reflection-based THz imaging system was built to conduct defect detection experiments on pharmaceutical blister packaging. The experimental results showed that this technology could accurately identify the thickness of plastic sheets inside corrugated paper and pearl cotton packaging and achieve visual identification of defects in blister capsules inside paper packaging. This research verifies the feasibility and superiority of THz-TDS technology in nondestructive detection of multi-layer packaging, achieving the research goals of nondestructive, rapid, and precise detection, and providing a new technical path for packaging quality inspection.

Key words

Terahertz time-domain spectroscopy technology / non-destructive detection / multi-layer packaging / defect identification

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KANG Kai, WU Wangjie, ZHANG Xiaochuan, SUO Yijin. Nondestructive Detection Method for Multi-layer Packaging Structures Based on Terahertz Time-Domain Spectroscopy[J]. Packaging Engineering. 2026, 47(7): 140-148 https://doi.org/10.19554/j.cnki.1001-3563.2026.07.017

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