Terahertz-dependent PM2.5 monitoring and grading in the atmosphere

Miao, Xinyang; Zhan, Honglei; Zhang, Zhenwei; Xu, Lei; Zhang, Cunlin; Xiao, Lizhi

doi:10.1007/s11433-018-9237-1

Cited by 13 publications

(3 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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]. In this paper, the THz-TDS is employed to characterize a Chinese medicine of Lapis Chloriti.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Terahertz Time Domain Spectroscopy (THz-TDS) is a powerful analytical technique which is able to directly provide information on the real and imaginary components of a materials refractive index, providing a vital spectroscopy technique to investigate material properties such as biological samples [1][2][3][4], semiconductor manufacturing [5], pharmaceuticals [6][7][8][9], monitoring atmospheric pollution [10], and mineral science applications [11]. THz-TDS also has been used for interrogating light-matter interactions such as plasmons [12][13][14][15], polaritons [16][17][18], and charge carrier dynamics [19,20].…”

Section: Introductionmentioning

confidence: 99%

THz-TDS parameter extraction: empirical correction terms for the analytical transfer function solution

Gorecki

Apostolopoulos

2021

Appl. Opt.

View full text Add to dashboard Cite

Terahertz time-domain spectroscopy (TDS) is capable of determining both real and imaginary refractive indices of a wide range of material samples; however, converting the TDS data into complex refractive indices typically involves iterative algorithms that are computationally slow, involve complex analysis steps, and can sometimes lead to non-convergence issues. To avoid using iterative algorithms, it is possible to solve the transfer function analytically by assuming the material loss is low; however, this leads to errors in the refractive index values. Here we demonstrate how the errors created by solving the transfer function analytically are largely predictable, and present a set of empirically derived equations to diminish the error associated with this analytical solution by an impressive two to three orders of magnitude. We propose these empirical correction terms are well suited for use in industrial applications such as process monitoring where analysis speed and accuracy are of the utmost importance.

show abstract

“…The northern area of China has witnessed incessant haze pollution in recent years. This predominant in cities with high industrial activities, and occurs mainly during the winter or spring season [1][2]. The major component of haze is the particulate matter (PM).…”

Section: Introductionmentioning

confidence: 99%

Inhibiting oxidation and enhancing absorption characteristics of sodium sulfite for SO2 removal from the non-ferrous smelting flue gas

Yuan

Zhang

et al. 2020

Environmental Engineering Research

View full text Add to dashboard Cite

In this work, we investigated the absorption characteristics of SO2 and the effect of inhibitors on the desulfurization performances of Na2SO3. The results showed that the NO2 had a competitive effect with SO2 on SO32- which resulted in a significant decrease in the absorption capacity of SO2. O2 in the flue gas could decrease the absorption capacity of SO2 due to the oxidation of Na2SO3. Besides, Na2S2O3 had more excellent inhibiting effect on the oxidation of SO32-; the inhibition mechanism is understood on the basis of the free radical chain reaction, whereby S2O32- combined with the sulfite free radical to form an inert substance, thus, quenching the reaction of free radical with the dissolved oxygen and invariably inhibiting the oxidation of SO32-. Furthermore, the intrinsic and the apparent oxidation kinetics of Na2SO3 oxidation process with Na2S2O3 were investigated to explain the relationships between consumption rates of SO32- and the absorption capacities of SO2 under different components in flue gas and absorption solution.

show abstract

Terahertz-dependent PM2.5 monitoring and grading in the atmosphere

Cited by 13 publications

References 27 publications

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

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

THz-TDS parameter extraction: empirical correction terms for the analytical transfer function solution

Inhibiting oxidation and enhancing absorption characteristics of sodium sulfite for SO2 removal from the non-ferrous smelting flue gas

Contact Info

Product

Resources

About