Monitoring PM2.5 in the Atmosphere by Using Terahertz Time-Domain Spectroscopy

Zhan, Honglei; Bao, Rima; Xiao, Lizhi

doi:10.1007/s10762-016-0283-8

Cited by 25 publications

(13 citation statements)

References 22 publications

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“…The THz radiation has many advantages over other imaging modalities in many aspects including non-ionizing [7], classifying species of tissue [8], and scattering and water absorption for porosimetry [9]. As a result, the terahertz radiation has shown widespread potential applications in diverse areas to address the real-world problems including genomics [10], medical diagnostics [11], pharmacology [12], healthcare applications [13] [14], Body-Area Networks (BAN) [15] [16], wireless communication [17] [18], environmental monitoring [19], agriculture [20] and food analysis [21] [22], defence and security [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Ren

Zahid

Fan

et al. 2019

Trends in Food Science & Technology

119

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Past few years have witness a dramatic change in the field of terahertz (THz) technology. The recent advancements in the technology for generation, manipulation and detection exploiting THz radiation have brought revolution in the field. Many researchers around the world have been inspired by the potential of invaluable new applications of THz sensing for food and water contamination detection. The microbial pollution in water and food is one the crucial issues with regard to the sanitary state for drinking water and daily consumption of food. To address this risk, the detection of microbial contamination is of utmost importance since the consumption of insanitary or unhygienic food can lead to catastrophic illness. This paper presents a first-time review of the open literature focused on the advances in the THz sensing for microbiological contamination of food and water and state-of-theart network architectures, applications, industrial trends and recent developments. Finally, open challenges and future research directions are presented with in the field.

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Section: Introductionmentioning

confidence: 99%

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Ren

Zahid

Fan

et al. 2019

Trends in Food Science & Technology

119

View full text Add to dashboard Cite

show abstract

“…In addition to toxic gases, detection of particulates in the atmosphere is also vitally important for pollution monitoring. Two studies have used TDS to measure levels of PM2.5, i.e., concentration of particles with a mean size of 2.5 μm [177,178], detecting concentrations as low as 20 μg/m 3 .…”

Section: Gas Sensingmentioning

confidence: 99%

Industrial Applications of Terahertz Sensing: State of Play

Naftaly

Vieweg

Deninger

2019

Sensors

236

106

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“…THz-TDS and THz spectroscopic imaging are widely used to study multi-component mixtures [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34] such as chemical mixtures of neutral substances [18,19,20,21,22,23,24], explosives [25,26,27,28], illicit drugs [29], amino acids [30,31,32], and neurotransmitters metabolites in biomedicine [33]. THz-TDS is used for monitoring the components and content of PM2.5 particulates in the atmosphere [34] that is of great importance for pollution control and environmental protection. It is worth noting that, in most of these papers, in order to determine the components concentrations in the mixture, THz-TDS is used together with different chemometrics methods in the transmission mode.…”

Section: Introductionmentioning

confidence: 99%

“…Then the quantitative models were obtained by stepwise regression. A back propagation (BP) neural network was applied in [34] for the qualitative and quantitative analysis of the mixtures. Recall that the back propagation method is a modification of the classical gradient descent method and in some cases, it is more efficient than the least squares method.…”

Section: Introductionmentioning

confidence: 99%

A Possible Way for the Detection and Identification of Dangerous Substances in Ternary Mixtures Using THz Pulsed Spectroscopy

Trofimov

Varentsova

2019

Sensors

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We discuss an effective tool for the detection and identification of substances in ternary mixtures with similar spectral properties using a broadband reflected THz signal. Nowadays, this is an urgent problem; its effective solution is still far off. Two ternary mixtures of the explosives (RDX+TNT+HMX and RDX+TNT+PETN) were used as the examples for demonstration of the efficiency of the method proposed. The identification is based on the pulsed THz spectroscopy. We follow the spectral intensities together with the use of integral correlation criteria. They use the spectral line dynamics of the THz pulse reflected from the substance under investigation and that of the standard THz signal from database. In order to increase the accuracy and reliability of the identification, we analyze the partial non-overlapping time intervals, containing the main pulse of the reflected THz signal and the sequential sub-pulses. The main pulse is shown to contain information about high absorption frequencies (ν > 2.6 THz) of the mixture components. In the sub-pulses, the absorption frequencies of the components are detected in the range of low (ν < 2.6 THz) and high (ν > 2.6 THz) frequencies. The opportunity of distinguishing the mixtures with similar spectral properties is also shown.

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Monitoring PM2.5 in the Atmosphere by Using Terahertz Time-Domain Spectroscopy

Cited by 25 publications

References 22 publications

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Industrial Applications of Terahertz Sensing: State of Play

A Possible Way for the Detection and Identification of Dangerous Substances in Ternary Mixtures Using THz Pulsed Spectroscopy

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