Sensitive characterizations of polyvinyl chloride using terahertz time-domain spectroscopy

Zhang, Tong; Huang, Haochong; Zhang, Zili; Gao, Hua; Zheng, Zhiyuan

doi:10.1016/j.infrared.2021.103878

Cited by 21 publications

(9 citation statements)

References 48 publications

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“…Improvement of the resolution of terahertz imaging through algorithm research has also been reported [21,22]. And sensitive characterizations of polymers investigated using terahertz time-domain spectroscopy has been reported [23]. The above researches have laid the foundation for the further development of terahertz nondestructive inspection techniques.…”

Section: Introductionmentioning

confidence: 93%

Nondestructive inspection of packaged microcircuits by aperture-type terahertz near-field imaging

Wang¹,

Chang²,

Cui³

2022

J. Phys. D: Appl. Phys.

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A scanning aperture-type terahertz near-field imaging system is developed to perform precise nondestructive testing on packaged aluminum etched antenna arrays, and surface imaging of a flexible gold electrode array, to obtain subsurface imaging and surface imaging. The resolution of subsurface imaging is 110 μm and 500 μm when the packaging (polyethylene terephthalate) thickness is 50 μm and 200 μm respectively, and the surface imaging resolution is 6 μm at 0.11 THz. An adaptive threshold segmentation algorithm of Hilbert scan combined with wavelet transform were employed to successfully suppress the noise of the imaging results due to the change of near-field distance. We also proposed a derivative filtering extremum threshold segmentation algorithm to effectively suppress severely uneven threshold distribution of the packaged aluminum etched antenna arrays.

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Section: Introductionmentioning

confidence: 93%

Nondestructive inspection of packaged microcircuits by aperture-type terahertz near-field imaging

Wang¹,

Chang²,

Cui³

2022

J. Phys. D: Appl. Phys.

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“…As a contrast, terahertz wave penetrates flake materials with low single-photon energy and does not harm the sample. 10,11 In particular, although there have been studies of plastics in terahertz band, [12][13][14] the reports on the aging of PVC are rare. It is of great significance to explore the feasibility of terahertz method to detect molecular change that occurs slowly so as to determine residual life of PVC components.…”

Section: Introductionmentioning

confidence: 99%

Terahertz dielectric spectroscopy based thermal‐oxidative aging analysis of polyvinyl chloride

Zhang,

Feng,

et al. 2024

Micro & Optical Tech Letters

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Polyvinyl chloride (PVC) is a polymer widely used in the world whereas safety problems owing to PVC aging are often reported. Thermal‐oxidative aging is known the main cause of its performance deterioration and lifetime decreasing. The existing PVC aging detection methods are complicated, making it difficult to achieve rapid on‐site diagnosis. The purpose of this paper is to evaluate the degree of PVC aging by means of terahertz technology. Samples were subject to thermal‐oxidative aging, and the corresponding dielectric spectra were measured by a terahertz time‐domain spectrometer. It turns out that the aging dependent dielectric spectra conforms to the physicochemical theory. Moreover, numerical correlation between the change in permittivity and the degree of aging, underlying a new solution for the aging forecast aimed at plastics.

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“…However, none of the above means can obtain the vital phase information on the crystal. Terahertz time-domain spectroscopy (THz-TDS) can detect phase-shift signal, but it has low imaging ability in the long-wave band. − There is an urgent need for a phase detection method in the short-wavelength band to bridge the gap in the infrared spectrum.…”

Section: Introductionmentioning

confidence: 99%

Free Field of View Infrared Digital Holography for Mineral Crystallization

Huang,

Yuan,

Zhang

et al. 2023

Crystal Growth & Design

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Investigating the crystallization process is a crucial approach for understanding crystal properties. However, traditional optical microscopy and infrared spectroscopy often fail to capture essential information, particularly during the crystallization behavior, due to common limitations in the field of view and the inability to obtain phase features. To address these challenges, a novel approach is proposed that combines a free field of view scheme with infrared holographic detection for dynamic crystal observation. This configuration enables the acquisition of phase attributes of targets in a field of view. We analyze the issue of displacement errors in reconstruction and overcome it by employing a subpixel displacement registration and intensity calibration algorithm. Experimental verification demonstrates that the present approach can not only be applied to the study of crystallization processes but also enables the amplitude and phase characteristics of steady resolution targets, artificial samples, natural objects, and minerals in the infrared band. Infrared digital holography using the free field of view, ranging from 1.2 million pixels to 55 million pixels, is expected to be a promising technical tool in the research of crystallography and mineral materials identification, especially in the blind spot of traditional detection techniques, where more detailed properties can be obtained through phase information.

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Sensitive characterizations of polyvinyl chloride using terahertz time-domain spectroscopy

Cited by 21 publications

References 48 publications

Nondestructive inspection of packaged microcircuits by aperture-type terahertz near-field imaging

Nondestructive inspection of packaged microcircuits by aperture-type terahertz near-field imaging

Terahertz dielectric spectroscopy based thermal‐oxidative aging analysis of polyvinyl chloride

Free Field of View Infrared Digital Holography for Mineral Crystallization

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