Application of Terahertz Time-Domain Spectroscopy in nondestructive testing of adhesion quality

Duo Zhao; Jiaojiao Ren; Xiaoli Qao; Lijuan Li

doi:10.1117/12.2199643

15 October 2015 Application of Terahertz Time-Domain Spectroscopy in nondestructive testing of adhesion quality

Duo Zhao, Jiaojiao Ren, Xiaoli Qao, Lijuan Li

Proceedings Volume 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology; 96741P (2015) https://doi.org/10.1117/12.2199643
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

Multilayer composites assembled flexibly with have important effect on the performance and safety of aircrafts. The nondestructive detection on the adhesion layer is an important index to evaluate the quality of aircraft assembly. Terahertz Time-Domain Spectroscopy (THz-TDS) is a newly developed spectroscopy technique based on femtosecond laser technology which currently applied to qualitative analysis as a means of security detection and material identification. Compared with the traditional tensile testing, the detection of defects in the adhesion layer could be nondestructive, visible, positioning and more accurate. The spectral analysis on the material to be assembled was done respectively. The testing model was established in accord with the extracted optical parameters. With the employment of a reflective THz-TDS device, X-Y spot scanning was done to obtain waveforms of every location on an assembled sample. Layered analysis was done by selecting region of interest in time domain waveforms. Conclusions of Time- Frequency spectrum analysis and scanning imaging performance are relatively satisfying through the experiments. The defects could be located and analyzed accurately and efficiently. The research reveals that THz-TDS (0.1THz~5THz) has good testing performance on the adhesion quality of multilayer composites.

Citation Download Citation

Duo Zhao, Jiaojiao Ren, Xiaoli Qao, and Lijuan Li "Application of Terahertz Time-Domain Spectroscopy in nondestructive testing of adhesion quality", Proc. SPIE 9674, AOPC 2015: Optical and Optoelectronic Sensing and Imaging Technology, 96741P (15 October 2015); https://doi.org/10.1117/12.2199643

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KEYWORDS

Terahertz spectroscopy

Composites

Terahertz radiation

Nondestructive evaluation

Spectroscopy

Adhesives

Statistical analysis

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