Real-time nondestructive imaging with THz waves

Zhang, Liangliang; Karpowicz, Nick; Zhang, Cunlin; Zhao, Yuejin; Zhang, Xicheng

doi:10.1016/j.optcom.2007.11.063

Cited by 22 publications

(14 citation statements)

References 8 publications

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“…The active terahertz pulse imaging based on the terahertz time domain spectroscopy (THz-TDS) has been investigated in our laboratory for some years [21][22][23][24][25], including THz transmission/amplitude imaging [21], THz polarization imaging [22][23], and THz phase imaging [24][25]. At the same time, the active THz pulse imaging is developed and applied for the quasi-near field measurement based on the terahertz time-domain spectroscopy with the probe-beam-expanded femtosecond pulse laser and an infrared CCD detection [16][17][18][19].…”

Section: Overview Of Active Terahertz Imagingmentioning

confidence: 99%

Terahertz Imaging Progress at Capital Normal University

Zhao¹

2017

IJASS

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The progress on terahertz imaging at Capital Normal University in Beijing is presented. Our works on TerahertzImaging include the active and passive imaging. For the active terahertz imaging, the pulse and continue wave terahertz imaging are studied, respectively. The active terahertz pulse imaging is based on the terahertz time-domain spectroscopy (THz-TDS). A practical focus-plane imaging system is built up based on the THz-TDS with the probe-beam-expanded electro-optical sampling and an infrared CCD imaging. The active terahertz continuous wave imaging is based on a CO 2 -laser-pumped terahertz coherent source and an uncooled bolometer array of terahertz camera. The active terahertz polarization imaging and wave front imaging is developed. For the passive terahertz imaging, the low frequency of radiometers are used to detect the point-to-point beam-scanned terahertz signal by the optical focusing and scanning system so that the passive THz imaging is realized for the security inspection of human body. The related components and image processing methods are studied and used for the improvement of imaging speed and resolution. The research on THz imaging technology at Capital Normal University is opening up a potential application in the field of non-destructive testing and security inspection for the terahertz technology.

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Section: Overview Of Active Terahertz Imagingmentioning

confidence: 99%

Terahertz Imaging Progress at Capital Normal University

Zhao¹

2017

IJASS

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“…These systems use a ZnTe crystal to convert a THz signal into a two-dimensional optical image, which can be recorded by a CCD camera. Recently, real-time measurement speeds have been achieved [35]. However, the required laser power scales linearly with the number of pixels, limiting the applicability of systems such as expensive laser systems with an output power of several hundred milliwatts to be employed.…”

Section: Approaches Toward Fast Terahertz Imagingmentioning

confidence: 99%

Terahertz imaging: applications and perspectives

et al. 2010

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Terahertz (THz) spectroscopy, and especially THz imaging, holds large potential in the field of nondestructive, contact-free testing. The ongoing advances in the development of THz systems, as well as the appearance of the first related commercial products, indicate that large-scale market introduction of THz systems is rapidly approaching. We review selected industrial applications for THz systems, comprising inline monitoring of compounding processes, plastic weld joint inspection, birefringence analysis of fiber-reinforced components, water distribution monitoring in polymers and plants, as well as quality inspection of food products employing both continuous wave and pulsed THz systems.

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“…As such, concealed items made of glass or ceramics can also be detected and imaged using this approach. Even items like plastic toy guns have been shown to be detectable with THz-TDS imaging (62). Threats can be identified on the basis of spectral features as well as the shape of the imaged object.…”

Section: Explosives and Securitymentioning

confidence: 99%

Terahertz Time-Domain Spectroscopy of Solid Samples: Principles, Applications, and Challenges

Smith

Arnold

2011

Applied Spectroscopy Reviews

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Advances in ultrafast lasers and semiconductor technologies have facilitated access to the terahertz (THz) frequency range for spectroscopic and imaging purposes. THz time-domain spectroscopy (TDS) is commonly used to acquire spectral data having high signal-to-noise ratios (SNRs) over a broad range of THz frequencies. THz-TDS instrumentation is commercially available, thereby enabling novel applications of THz time-domain (TD) imaging and spectroscopy in a myriad of applications. This review gives a general description of the instrumentation available for collecting THz-TD data and focuses on measurements of solid samples. Measurement geometries useful forcollecting THz-TD data from solid samples are reviewed and a summary is presented of the major applications to the analysis of solid samples related to security issues, as well as samples originating from the pharmaceutical industry, dental sciences, biological samples, and polymer materials. Emphasis is also given to analytical applications in a discussion of the analytical challenges met in quantification of solid analytes by THz-TDS methods.

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Real-time nondestructive imaging with THz waves

Cited by 22 publications

References 8 publications

Terahertz Imaging Progress at Capital Normal University

Terahertz Imaging Progress at Capital Normal University

Terahertz imaging: applications and perspectives

Terahertz Time-Domain Spectroscopy of Solid Samples: Principles, Applications, and Challenges

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