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Porosity detection in CFRP using reflective terahertz imaging



  1. School of Instrument Science and Optoelectronics Engineering, Beijing Information Science and Technology University, Beijing, 100192, PR China


Terahertz (THz) waves are potential safe and non-destructive inspection tool for industrial use. Reflective THz imaging using THz time-domain spectroscopy (THz-TDS) has been demonstrated as a fast, accurate, non-contact, and non-destructive inspection approach to evaluate the sub-surface layer porosity distribution of carbon fiber reinforced polymer (CFRP) materials used in aerospace. Our experiments show that the reflected THz amplitude and the time of flight (ToF) from THz imaging, can be used as parameters to evaluate porosity distributions. The volumetric average sensitivity of porosity tests based on amplitude imaging and ToF imaging reached ̴ 3.5 % and ̴ 2.5 %, respectively..


Terahertz, Porosity, Non-destructive inspection, Composite.

Submitted at: March 7, 2022
Accepted at: Oct. 5, 2022


YANDONG GONG, JIANXIONG TANG, KAI PANG, Porosity detection in CFRP using reflective terahertz imaging, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 9-10, pp. 413-418 (2022)