Continuous-wave terahertz high-resolution imaging via synthetic hologram extrapolation method using pyroelectric detector

Huang, Haochong; Qiu, Peiyao; Panezai, Spozmai; Hao, Sibo; Zhang, Donglei; Yang, Yongqing; Ma, Yuanyuan; Gao, Hua; Zhang, Zili; Zheng, Zhiyuan

doi:10.1016/j.optlastec.2019.105683

Cited by 42 publications

(15 citation statements)

References 37 publications

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“…This technology has been also applied to detect agricultural pollution 45 . Terahertz techniques offer significant advantages for qualitative and quantitative studies of heavy metal ions in soil contaminants because of the complex structure of soil and its unique absorption properties for terahertz waves 46 – 48 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of the remediation of chromium ion contamination with bentonite by terahertz time-domain spectroscopy

Cheng

Huang

Yang

et al. 2022

Sci Rep

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Heavy metal pollution of agricultural and urban soils limits economic progress in the rapidly developing society. Terahertz technology is applied to detect heavy metal pollutants under existence of multiple pathways of their dissemination. In this study, terahertz time-domain spectroscopy (THz-TDS) is employed as an advanced probing technique in combination with traditional detecting methods to measure the adsorption ability of trivalent chromium ions on bentonite. The concentration of chromium ions and the weight of bentonite are known to influence on the adsorption capacity of the latter. It is tested here by both qualitative and quantitative measurements of two mentioned parameters. The adsorption process of chromium ions by bentonite is monitored using THz-TDS. The adsorptions signal from samples at 0.5 THz gradually increases with the increase of bentonite weight or chromium ion concentration. It would appear to indicate that terahertz could be used for quantitative detection of metal ions. Secondly, the ratios of results obtained by inductively coupled plasma mass spectrometry (ICP-MS) and the THz-TDS ones are stabilized at 0.105 ± 0.014 as the bentonite weight or chromium ion concentration increase. Such finding confirms that terahertz technology can be used for the quantitative detection of metal ions. Using the relationship between the ICP-MS test results and the THz-TDS ones, the amplitude value of bentonite is obtained to be 13.925 at the concentration of chromium ions of 0.05 mol/L, the mass of bentonite sample involved in adsorption of 1.5 g, and the detection frequency in THz-TDS measurements of 0.5 THz. The adsorption coefficient of bentonite is calculated to be 1.44%. Increase of the chromium ion concentration to 0.2 mol/L, and the mass of bentonite involved in adsorption to 3 g leads to the increase of the amplitude corresponding to adsorbed chromium ions to about 19.463, and the adsorption coefficient to about 2.1%. Obtained results demonstrate that terahertz technology is promising to meet the ever-increasing requirements in mineral analyses for rapid detection of chemical contaminants and measurement of the adsorption efficiencies of materials.

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Section: Introductionmentioning

confidence: 99%

Characterization of the remediation of chromium ion contamination with bentonite by terahertz time-domain spectroscopy

Cheng

Huang

Yang

et al. 2022

Sci Rep

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“…Terahertz technology has emerged with the development of lasers and electronics. Outstandingly, terahertz time-domain spectroscopy (THz-TDS), as an emerging detection method, is a non-destructive measuring device, from which the real-time power of terahertz pulses can be obtained with a high signal-to-noise ratio (SNR) compared to infrared spectroscopy, and THz-TDS can directly measure the amplitude of the electric field without contacting samples [17][18][19]. These advantages have made THz-TDS technology gain significant progress in biology, energy, and geology [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Insights into a Mineral Resource Chlorite Mica Carbonate Schist by Terahertz Spectroscopy Technology

et al. 2022

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Nowadays, the mineral resources formed by geological processes have been effectively utilized with the boom exploration of novel technologies. Traditional analytical methods, such as X-ray Fluorescence, X-ray diffraction, and Scanning electron microscopy, remain the commonly used approaches for resource detection. However, recent accelerations in terahertz component progress have promoted researchers to discover more potential technologies in mineral resource exploration. In this article, the various porosities and calcination products of Chlorite mica carbonate schist, a mineral resource and potent medicine, are detected using the terahertz time–domain spectroscopy. The terahertz constant measurement of Chlorite mica carbonate schist tablets including the amplitude and phase values was carried out. After Fourier transforms, notable differences of absorption coefficients and refractive index are observed from these experimental samples, which have compelling indications to quantitatively analyze the pore conditions and pyrolytic properties of mineral resources. This active research has vital implications for the rock reservoir properties analysis and mineral energy utilization. It is also identified that terahertz time–domain spectroscopy can be considered as a promising method for the qualitative, reliable, and efficient detection of mineral resources.

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“…However, the development and application of terahertz pulse imaging systems are restricted by the demand on the pump laser, including transmitting power, operating environment, integration and cost [13], [14]. Typically femtosecond laser, free electron laser, quantum cascade laser, CO 2 -pumped laser and fiber laser were used [15]. Among them, fiber laser is the most widely used because of its small size, high energy conversion efficiency, and suitability for portable systems.…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, the delay line, an indispensable part of the THz time-domain spectroscopic system, is usually controlled by mechanical linear or rotary motion, which directly impact on the time and frequency resolution, and it limits the scanning time and the image reconstruction rate. In recent years, some research groups have developed non-mechanical scanning delayers with dual-pulse lasers of different frequencies, but at the cost of adding an expensive femtosecond laser and electronic feedback, which increases the cost and complexity [15]- [17]. Thirdly, the maximum thickness of measurable sample is about 10 mm, limited by the length of the delay line.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Terahertz Continuous Wave Imaging Radar for Nondestructive Testing

et al. 2020

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In recent years, our research group has been devoting substantial efforts to the research and development of active all-solid-state electronic terahertz (THz) continuous wave imaging systems for nondestructive testing, which is currently benefitting from the increasing amount of transmitting power, high performance/cost ratio and adaptability to engineering. In this paper, an in-house developed broadband linear frequency modulated continuous wave (LFMCW) three-dimensional (3D) THz imaging system is described, and two sets of experimental platforms are set up to assist the planning and completion of the research, including a narrow-band LFMCW 3D imaging radar and a wide-band stepped-frequency modulated continuous wave 3D imaging radar. For 3D imaging systems, to cope with demanding scenarios and to achieve excellent imaging performance, various reconstruction algorithms are explored. The first is a spectral refinement and correction approach based on fast Fourier transform and modern spectral estimation for accurate thickness measurement. The second is the synthetic aperture radar imaging algorithm for surface detection or internal detection of objects with lower refractive index. The third is a 3D reconstruction algorithm based on half space Green's function and the exploding source model for the interior detection of materials with higher refractive index. The fourth is the frequency interference algorithm combining phase unwrapping to measure uneven and nonplanar surfaces. Exploiting these systems, along with the associated experimental platforms and reconstruction algorithms, we successfully implemented non-destructive testing for objects with various defects and of different materials, such as polymer boards with voids, and foam with inclusions.INDEX TERMS Continuous wave imaging sensors, nondestructive testing, three-dimensional reconstruction, all-solid-state electronics.

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Continuous-wave terahertz high-resolution imaging via synthetic hologram extrapolation method using pyroelectric detector

Cited by 42 publications

References 37 publications

Characterization of the remediation of chromium ion contamination with bentonite by terahertz time-domain spectroscopy

Characterization of the remediation of chromium ion contamination with bentonite by terahertz time-domain spectroscopy

Insights into a Mineral Resource Chlorite Mica Carbonate Schist by Terahertz Spectroscopy Technology

Three-Dimensional Terahertz Continuous Wave Imaging Radar for Nondestructive Testing

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