Qualitative identification of crude oils from different oil fields using terahertz time-domain spectroscopy

Zhan, Honglei; Shi-xiang, WU; Bao, Rima; Ge, Lina

doi:10.1016/j.fuel.2014.11.047

Cited by 95 publications

(43 citation statements)

References 23 publications

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“…After being focalized and reflected by a lens and a mirror, the collimated THz pulse transmits the sample and then the sample-information-carried THz pulse reaches the silicon wafer, meeting the delayed probe beam. The optical signal is detected by a balance detector, amplified by a lock-in amplifier and finally processed by the LabVIEW software [ 18 , 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy

Song

Zhao

Zuo

et al. 2017

Sensors

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Flow characteristics of water were tested in a rectangular microchannel for Reynolds number (Re) between 0 and 446 by terahertz time domain spectroscopy (THz-TDS). Output THz peak trough intensities and the calculated absorbances of the flow were analyzed theoretically. The results show a rapid change for Re < 250 and a slow change as Re increases, which is caused by the early transition from laminar to transition flow beginning nearly at Re = 250. Then this finding is confirmed in the plot of the flow resistant. Our results demonstrate that the THz-TDS could be a valuable tool to monitor and character the flow performance in microscale structures.

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Section: Methodsmentioning

confidence: 99%

The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy

Song

Zhao

Zuo

et al. 2017

Sensors

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“…Therefore, they show strong absorption and dispersion characteristics in this band [18][19][20]. The spectral properties through resonance absorption of materials to terahertz radiation can be studied by terahertz time-domain spectroscopy (THz-TDS) technology [21,22]. Compared with traditional spectroscopy, terahertz spectroscopy can simultaneously provide amplitude and phase information of terahertz signal [23].…”

Section: Introductionmentioning

confidence: 99%

Study of 2,4-D Spectral Characteristics and Its Detection in Zizania Latifolia Using Terahertz Time-Domain Spectroscopy

Nie

Cai

et al. 2019

Applied Sciences

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2,4-Dichlorophenoxyacetic acid (2,4-D) is a common plant growth regulator, which can remain in food and, with long-term consumption, threaten human health. Therefore, it is necessary to propose an effective detection method. Terahertz time-domain spectroscopy technique (THz-TDS) has good advantages in the quantitative and qualitative analysis of most biomolecules due to its rich fingerprint characteristics. In this paper, density functional theory (DFT) was applied to geometry optimization and frequency vibration calculation of 2,4-D, and THz-TDS was used to quantitatively detect 2,4-D in Zizania latifolia. The results showed that there were three characteristic absorption peaks of 2,4-D at 1.36, 1.60, and 2.38 THz, respectively, and the theoretical spectra were in good consistency with experimental spectra, with slight discrepancies. Additionally, the absorption peak at 1.36 THz had the best absorption characteristics and was chosen as the main peak for 2,4-D quantitative analysis. It was demonstrated that the limits of detection (LOD) of 2,4-D in Zizania latifolia were found to be as low as 5%, the absorbance intensity at 1.36 THz showed a good linear relationship (R2 = 0.9854) with 2,4-D concentration from 5% to 30%, and the recovery was 93.29%–98.75%. Overall, this work enriched the fingerprint database of pesticide molecules on the basis of terahertz spectroscopy and could provide a technical support for the detection of 2,4-D in food by terahertz spectroscopy.

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“…In addition, the terahertz technology has been applied to building materials, historical relics, reservoir rock, coal, oil and gas. [24][25][26][27][28][29][30][31][32] In the present work, the samples that were made by tableting were placed in parallel so as to imitate fractures with different scales. THz-TDS was used to detect gaps of samples, which will supplement existing methods.…”

Section: Introductionmentioning

confidence: 99%

Application of Terahertz Time-Domain Spectroscopy in Detecting Gaps with Different Widths

Bao

Wang

et al. 2017

ANAL. SCI.

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The characterization of fractures is of vital importance for studies in many industries. In the present work, we used terahertz reflection measurements to identify simulated gaps of different widths that resemble fractures. The time interval between pulses (Δt) was proportional to the distance between the interfaces. In addition, fast Fourier transform (FFT) corresponding to the waveforms was also employed to distinguish the gaps. The widths in frequency were found to be inversely proportional to that of the gaps. In general, both terahertz time-domain spectroscopy (THz-TDS) and terahertz frequency-domain spectroscopy (THz-FDS) can achieve the measurement of the gaps of micro size.

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Qualitative identification of crude oils from different oil fields using terahertz time-domain spectroscopy

Cited by 95 publications

References 23 publications

The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy

The Detection of Water Flow in Rectangular Microchannels by Terahertz Time Domain Spectroscopy

Study of 2,4-D Spectral Characteristics and Its Detection in Zizania Latifolia Using Terahertz Time-Domain Spectroscopy

Application of Terahertz Time-Domain Spectroscopy in Detecting Gaps with Different Widths

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