Dual-axis reflective continuous-wave terahertz confocal scanning polarization imaging and image fusion

Zhou, Yi; Li, Qi

doi:10.1117/1.oe.56.1.013103

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…[6][7][8] Continuous-wave (CW) THz confocal scanning imaging maps the amplitude distribution point-by-point, the resolution of which depends on the illumination beam size. 9,10 THz tomography obtains the three-dimensional absorption distribution of the object by reconstructing the projection map. The imaging speed is not fast and the resolution is limited.…”

Section: Introductionmentioning

confidence: 99%

Expanding the field-of-view and profile measurement of covered objects in continuous-wave terahertz reflective digital holography

et al. 2019

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Terahertz waves have unique propagation and penetration ability, and these reasons have been widely used in nondestructive testing. Compared with other terahertz imaging approaches, terahertz digital holography can retrieve both quantitative amplitude and phase information about an object wavefront in real time. A continuous-wave terahertz reflective digital holographic method is proposed for measuring the profile of covered objects. Subpixel image registration and image fusion algorithms are presented to expand the field-ofview (FOV) of the system. The validity of the proposed method is verified by the experiment using an optical pumped far-IR gas laser and a pyroelectric array detector. The profile of a metallic bookmark covered by a polytetrafluoroethylene plate is obtained. The FOV is expanded by a factor of 1.75 compared with that of a reconstruction performed employing single hologram.

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Section: Introductionmentioning

confidence: 99%

Expanding the field-of-view and profile measurement of covered objects in continuous-wave terahertz reflective digital holography

et al. 2019

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“…In imaging applications, the polarization information is especially important for determining the birefringence of materials, which is useful to probe their anisotropies [23,24]. However, terahertz polarization imaging has not been extensively studied until very recently [24][25][26][27][28][29][30][31][32]. One of the reasons was a lack of sufficiently fast and precise terahertz polarization detection systems, which are crucial to achieve high-speed imaging.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Polarization Imaging and Its Applications

Watanabe

2018

Photonics

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This review focuses on several recent research activities regarding precise and fast polarization-sensitive terahertz time-domain spectroscopy systems for imaging purposes, and explains three interesting application examples. Owing to modulation techniques that have recently been developed for the evaluation of the instantaneous terahertz electric-field (E-field) vector, fast and precise terahertz polarization imaging becomes feasible. This terahertz technology enables high-resolution surface topography, precise understanding of the spatial E-field vector distribution of the focused terahertz pulse, and examination of strain-induced birefringence in polymeric materials. These examples constitute a new application area of terahertz photonics with emphasis on both fundamental optics and industrial applications.

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