scholarly journals Volatile Liquid Detection by Terahertz Technologies

2021 ◽  
Vol 9 ◽  
Author(s):  
Harry W Baxter ◽  
Adam A Worrall ◽  
Jie Pang ◽  
Riqing Chen ◽  
Bin Yang
Keyword(s):  
Time Domain ◽  
Total Reflection ◽  
Thz Spectroscopy ◽  
Low Loss ◽  
Time Domain Spectroscopy ◽  
Liquid Samples ◽  
Volatile Liquid ◽  
Volatile Liquids ◽  
Line Scanner ◽  
2D Images

The prospect of being able to move through security without the inconvenience of separating liquids from bags is an exciting one for passengers, and there are important operational benefits for airports as well. Here, two terahertz (THz) systems, 100 GHz sub-THz line scanner and attenuation total reflection-based THz time domain spectroscopy (TDS), have been used to demonstrate the capability of identifying different liquid samples. Liquid samples’ THz complex permittivities are measured and their differences have contributed to the variation of 100 GHz 2D images of volatile liquids with different volumes inside of cannister bottles. The acquired attenuation images at 100 GHz can easily be used to distinguish highly absorbed liquids (Water, Ethanol, Fuel Treatment Chemicals) and low loss liquids (Petrol, Diesel, Kerosene and Universal Bottle Cleaner). The results give a promising feasibility for mm-wave imager and THz spectroscopy to efficiently identify different volatile liquids.

Feasibility Study on Rapid Analysis of Doxycycline Hydrochloride Aqueous Solution by Terahertz Time-Domain Spectroscopy

2019 ◽  
Vol 62 (1) ◽  
pp. 205-212
Author(s):  
Yuxin Huang ◽  
Chen Wang ◽  
Jianyuan Qin ◽  
Wendao Xu ◽  
Min Chen ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Time Domain ◽  
Rapid Analysis ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Thz Spectroscopy ◽  
Terahertz Time Domain Spectroscopy ◽  
Transmission Method ◽  
Time Domain Spectroscopy ◽  
Terahertz Transmission

Abstract. Antibiotics have been extensively applied in the treatment of infections in food-producing animals. However, the residues of these agents create a potential risk to human health. Among the methods available for rapid detection of antibiotics, terahertz time-domain spectroscopy (THz-TDS) has emerged as a technique with unique advantages over other methods. In this study, we demonstrate that rapid analysis of doxycycline hydrochloride (DCH) aqueous solutions could be achieved with THz-TDS through transmission, attenuated total reflection (ATR), and reflection with minimum detectable concentrations of 5000, 10, and 80 mg L-1, respectively, indicating that the ATR and reflection methods are superior to the transmission method for low-concentration aqueous solutions. This study is an effort to promote the development of rapid analysis of antibiotic residues in an aqueous matrix using THz spectroscopy. Keywords: Attenuated total reflection, Doxycycline hydrochloride solution, Reflection, Terahertz, Transmission.

scholarly journals Drawing materials studied by THz spectroscopy

ACTA IMEKO ◽  
2017 ◽  
Vol 6 (3) ◽  
pp. 12 ◽  
Author(s):  
Andrea Taschin ◽  
Paolo Bartolini ◽  
Jordanka Tasseva ◽  
Jana Striova ◽  
Raffaella Fontana ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Time Domain ◽  
Spectroscopic Technique ◽  
Thz Spectroscopy ◽  
Optical Parameters ◽  
Time Domain Spectroscopy ◽  
Synthetic Materials ◽  
Iron Gall ◽  
Liquid Deposition ◽  
Polyethylene Powder

THz time-domain spectroscopy in transmission mode was applied to study dry and wet drawing inks. In specific, cochineal-, indigo- and iron-gall based inks have been investigated; some prepared following ancient recipes and others by using synthetic materials. The THz investigations have been realized on both pellet samples, made by dried inks blended with polyethylene powder, and layered inks, made by liquid deposition on polyethylene pellicles. We implemented an improved THz spectroscopic technique that enabled the measurement of the material optical parameters and thicknesses of the layered ink samples on absolute scale. This experimental investigation shows that the THz techniques have the potentiality to recognize drawing inks by their spectroscopic features.

scholarly journals THz time-domain spectroscopy of mixed CO2–CH3OH interstellar ice analogs

2016 ◽  
Vol 18 (30) ◽  
pp. 20199-20207 ◽  
Author(s):  
Brett A. McGuire ◽  
Sergio Ioppolo ◽  
Marco A. Allodi ◽  
Geoffrey A. Blake
Keyword(s):  
Carbon Dioxide ◽  
Long Range ◽  
Time Domain ◽  
Thz Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Interstellar Ice

THz spectroscopy provides an exquisitely sensitive probe into the long-range structure and segregation of mixtures of two primary interstellar ice constituents: carbon dioxide and methanol.

Research on terahertz time-domain spectroscopy methodology of liquid samples

2010 ◽  
Vol 53 (4) ◽  
pp. 1012-1015 ◽  
Author(s):  
Lei Zhou ◽  
WeiWei Xu ◽  
BiaoBing Jin ◽  
Jian Chen ◽  
Lin Kang ◽  
...  
Keyword(s):  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Liquid Samples
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