Chemometric tools for analysing Terahertz fingerprints in a postscanner

Ellrich, Frank; Torosyan, G.; Wohnsiedler, S.; Bachtler, S.; Hachimi, Atiqa; Jonuscheit, Joachim; Beigang, R.; Platte, Frank; Nalpantidis, Konstantinos; Sprenger, Thorsten; Hübsch, Daniel

doi:10.1109/irmmw-thz.2012.6380158

Cited by 9 publications

(7 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4,7 Therefore, many advanced techniques and signal processing algorithms that are mainly based on time-domain spectroscopy (TDS) [1][2][3][4] have been proposed for the detection of dangerous materials in the reflection configuration. The first THz post scanner, T-cognition 1.0, which used a chemometric method along with principal component analysis, 8 is now commercially available. Michalopoulou et al 9 applied a modified least-squares approach and multilayer perceptrons to increase the probability of detection of RDX.…”

Section: Introductionmentioning

confidence: 99%

Identification of concealed materials, including explosives, by terahertz reflection spectroscopy

Pałka

2013

Opt. Eng

View full text Add to dashboard Cite

Abstract. We report on a method for extracting the characteristic features of covered materials, including hexogen, in the range from 0.5 to 1.8 THz. This time-domain spectroscopy-based technique takes into account only part of the signal reflected from a covered sample and analyzes it by using the Fourier transform. The obtained power spectrum has distinctive peaks that correspond to peaks measured in the transmission configuration and can be used for further identification of the materials. © IntroductionTerahertz (THz) radiation in the range of 0.3 to 3.0 THz has a strong potential for use in identification of covered explosive materials because of two key factors. Some commonly used explosive materials, such as hexogen (RDX), octogen (HMX), and penthryte (PETN) possess distinctive transmission 1,2 and reflection 3,4 spectral features (called "fingerprints") in the THz regime. Also, most commonly used nonpolar dielectric covering materials, such as cotton, polyester, paper, and plastic materials, show low absorption of THz waves. Since the attenuation properties of most explosive materials are relatively high, 2 the transmission configuration seems to be more applicable to samples that are a few millimeters thick, e.g., for use in mail scanners. In contrast, the reflection configuration is safer for inspection applications and is more suitable for performing detection on people and inside envelopes or bags. However, the reflection configuration is more complicated owing to the small reflectance from pure explosive materials, 4 the strong attenuation properties of water vapor, the scattering effects related to the morphology of the sample 5,6 as well as to the attenuation properties of the covering layers.

show abstract

Section: Introductionmentioning

confidence: 99%

Identification of concealed materials, including explosives, by terahertz reflection spectroscopy

Pałka

2013

Opt. Eng

View full text Add to dashboard Cite

show abstract

“…El Haddad et al applied principal component analysis (PCA), PLS, and artificial neural networks (ANN) to quantitative analysis of ternary mixtures by THz-TDS [31], and they obtained good results. Ellrich et al presented a postscanner by THz spectroscopy using chemometric methods for the evaluation of detected THz fingerprints [32].…”

Section: Application Of Chemometrics On Terahertz Spectra Analysismentioning

confidence: 99%

Application of Terahertz Technology in Biomolecular Analysis and Medical Diagnosis

Zhang¹,

Zhang²

2017

Terahertz Spectroscopy - A Cutting Edge Technology

View full text Add to dashboard Cite

Terahertz technology is a nondestructive technique, which has progressed significantly in the scientific research and gains highly attention in the analysis of biological molecular, cellular, tissues and organs. In this decade, some studies were reported on the application of terahertz technology in medical testing and diagnosis. Here, we summarize the terahertz characters, terahertz spectroscopy, and terahertz imaging technology combined with chemometrics. This chapter focuses on introducing the research progress on analyzing the tissues of cancers using terahertz spectroscopy and terahertz imaging technology. Furthermore, the problems should be solved, and development directions of terahertz spectroscopy and terahertz imaging technology are discussed.

show abstract

“…One of the driving forces behind the development of the terahertz technique (the spectral range from 0.1 to 10 THz) is the fact that many commonly used explosive materials (such as RDX, PETN, HMX, TNT and NQ) have unique spectral features in this range of radiation [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Moreover, non-polar dielectric materials (such as clothes, paper and plastics) are relatively transparent in the range up to about 3 THz [6,9], which raises hope of efficient identification of explosive materials remaining under cover or being inside packaging [6,12].…”

Section: Introductionmentioning

confidence: 99%

“…Experiments have been carried out in different temperatures [14]; also, solid-state density functional theory calculations have been performed [15]. Methods for identifying explosive materials by means of their spectra are constantly being developed [16][17][18][19]. RDX is the most widely investigated material due to the fact that it is a constituent of many commonly used plastic materials (such as C-4 and Semtex) and meltcastable materials (like Composition B).…”

Section: Introductionmentioning

confidence: 99%

Transmission and Reflection Terahertz Spectroscopy of Insensitive Melt-Cast High-Explosive Materials

Pałka

Szala

2016

J Infrared Milli Terahz Waves

View full text Add to dashboard Cite

Currently, artillery shells and grenades that are introduced into the market are based on melt-castable insensitive high explosives (IHEs), which do not explode while they run a risk of impact, heat or shrapnel. Particles of explosives (such as hexogen, nitroguanidine and nitrotriazolone) are suspended in different proportions in a matrix of 2.4-dinitroanisole. In this paper, we investigated samples of commonly used IHEs: PAX-41, IMX-104 and IMX-101, whose internal structures were determined by a scanning electron microscope. Terahertz time domain spectroscopy was applied in both transmission and reflection configurations. At first, the complex refraction indices of four pure constituents creating IHEs were determined and became the basis of further calculations. Next, the experimentally determined transmission and reflection spectra of IHEs and pure constituents were compared with theoretical considerations. The influence of the grain size of constituent material and scattering on the reflection spectra was analysed, and good agreement between the experimental and theoretical data was achieved.

show abstract

Chemometric tools for analysing Terahertz fingerprints in a postscanner

Cited by 9 publications

References 1 publication

Identification of concealed materials, including explosives, by terahertz reflection spectroscopy

Identification of concealed materials, including explosives, by terahertz reflection spectroscopy

Application of Terahertz Technology in Biomolecular Analysis and Medical Diagnosis

Transmission and Reflection Terahertz Spectroscopy of Insensitive Melt-Cast High-Explosive Materials

Contact Info

Product

Resources

About