Inspection of Aging and Defects of Polyethylene Pipe Joints Based on THz-TDS

Qiang, 陈强 Chen; Qiang, 王强 Wang; Xiaohong, 谷小红 Gu; Yue, 俞跃 Yu; Zhangwei, 凌张伟 Ling

doi:10.3788/lop56.223001

Cited by 3 publications

(3 citation statements)

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“…It has high defect detection and positioning ability, and its advantages in the field of non-destructive testing are gradually highlighted, which can be used as an effective supplement to traditional testing technology. Chen Qiang et al [2] detected the aging, wear marks, delamination and inclusion defects of PE pipe joints based on THz-TDS. The experimental results show that the absorption coefficient of the material decreases significantly with the increase of aging time.…”

Section: Introductionmentioning

confidence: 99%

Terahertz identification of inclusion defects in hot melt joint of polyethylene pipe

Xu¹,

Ren²,

Zhang³

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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The reflective pulsed terahertz time-domain spectroscopy system with a frequency range of 0.25 ~ 2.5 THz was used to detect the defects of polyethylene pipe hot-melt joints. Using white PE100 plate, normal and inclusion defect samples were made. Through the point-by-point scanning of the terahertz system, the waveform and kurtosis imaging are obtained. According to the difference between the waveform and the image, the presence or absence of defects and the size of defects can be distinguished. The sobel edge detection operator has a good recognition level for defects. The recognition error is below 6.47 %, and the error of metal recognition can reach 3.54 %.

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Section: Introductionmentioning

confidence: 99%

Terahertz identification of inclusion defects in hot melt joint of polyethylene pipe

Xu¹,

Ren²,

Zhang³

et al. 2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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“…In 2017, Yan et al [ 11 ] used terahertz time-domain spectroscopy (THz-TDS) technology to detect the aging degree of cross-linked polyethylene insulated cables, and found that in the frequency range of 0.7–2.5 THz, the dielectric constant decreases with the increase of aging time. Chen et al [ 12 ] used THz-TDS to detect and analyze artificially aged PE materials. The experimental results showed that the absorption coefficient of the material decreased significantly with the increase of aging time.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Spectroscopy Characterization and Prediction of the Aging Degree of Polyethylene Pipes Based on PLS

Ren

Zhang

et al. 2023

Materials

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Polyethylene (PE) is widely used in pipeline transportation owing to its excellent corrosion resistance, good stability, and ease of processing. As organic polymer materials, PE pipes inevitably undergo different degrees of aging during long-term use. In this study, terahertz time-domain spectroscopy was used to study the spectral characteristics of PE pipes with different degrees of photothermal aging, and the variation in the absorption coefficient with aging time was obtained. The absorption coefficient spectrum was extracted using uninformative variable elimination (UVE), successive projections algorithm (SPA), competitive adaptive reweighted sampling (CARS), and random frog RF spectral screening algorithms, and the spectral slope characteristics of the aging-sensitive band were selected as the evaluation indices of the degree of PE aging. Based on this, a partial least squares aging characterization model was established to predict white PE80, white PE100 and black PE100 pipes with different aging degrees. The results showed that the prediction accuracy of the absorption coefficient spectral slope feature prediction model for the aging degree of different types of pipes was greater than 93.16% and the verification set error was within 13.5 h.

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“…Terahertz time-domain pulse signal carries a lot of attenuation information of insulating materials to be measured, which can effectively characterize the aging characteristics of materials. It has good application potential and value in determining the aging degree of power cable outer insulation sheath [7][8][9][10] .…”

mentioning

confidence: 99%

Aging Analysis of Cable Insulation Material by Terahertz Time-domain Spectroscopy

Luo

Zhu²,

Liu

et al. 2023

J. Phys.: Conf. Ser.

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Insulation materials with high sealing, high insulation, high elasticity, and other characteristics are widely used in the power industry. In this paper, the terahertz time-domain reflection spectrum of cable insulation materials is studied, the optical parameters of cable insulation materials are extracted to characterize the aging state of cable insulation materials, the terahertz time-domain reflection signal of insulation materials with different degrees of aging is tested, and the terahertz reflection spectrum of insulation sheaths is analyzed. The relationship between the aging degree and absorption coefficient in terahertz time-domain spectral reflection mode is obtained. There are obvious differences in the absorption characteristics of cable insulation materials with different degrees of aging in the terahertz band. The longer the aging time is, the greater the absorption coefficient is and the lower the refractive index is. Terahertz time-domain reflectometry plays a role in cable protection with high detection accuracy in the characterization of cable insulation materials.

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Inspection of Aging and Defects of Polyethylene Pipe Joints Based on THz-TDS

Cited by 3 publications

References 0 publications

Terahertz identification of inclusion defects in hot melt joint of polyethylene pipe

Terahertz identification of inclusion defects in hot melt joint of polyethylene pipe

Terahertz Spectroscopy Characterization and Prediction of the Aging Degree of Polyethylene Pipes Based on PLS

Aging Analysis of Cable Insulation Material by Terahertz Time-domain Spectroscopy

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