Preliminary study on using near-infrared spectroscopy at 1.6–2.4 µm for document examination

Sugawara, Shigeru; Huck, Christian W.

doi:10.1016/j.infrared.2020.103212

Cited by 7 publications

(5 citation statements)

References 26 publications

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“…14 Eight types of printer Source: reproduced with permission from Sugawara and Huck, 2020. 14 paper (average spectra resented in Figure 4(a)) and 10 types of colorants (average spectra resented in Figure 4 (b)) were included in the experimental set. A portable NIR spectrometer (microPHAZIR, Thermo Scientific) was used for spectral measurements.…”

Section: Document Examination In Forensic Applicationsmentioning

confidence: 99%

“…In the fourth of the case studies discussed here, we examined whether handheld NIR spectroscopy can be successfully used to identify paper and colorants as a rapid screening method in document examination. 14 Portable NIR spectroscopy is an extremely potent tool as it combines the typical advantages of this technique with on-site capability. 15 The technology of miniaturized spectrometers rapidly progresses in NIR spectroscopy, more so than witnessed for most other techniques.…”

Section: Practical Application Potential Of Nir Spectroscopy Comparedmentioning

confidence: 99%

“…16 In the mentioned case study, we checked whether the samples, which are difficult to distinguish by naked eye approach, can be discriminated based on their NIR spectra by unsupervised PCA and supervised classification method, DA. 14 Eight types of printer paper (average spectra resented in Figure 4(a)) and 10 types of colorants (average spectra resented in Figure 4(b)) were included in the experimental set. A portable NIR spectrometer (microPHAZIR, Thermo Scientific) was used for spectral measurements.…”

Section: Practical Application Potential Of Nir Spectroscopy Comparedmentioning

confidence: 99%

“…(a) Average spectra of paper samples; (b) average spectra of black colorant samples; (c) scatter plots of principal component scores of paper samples; (d) scatter plots of principal component scores of black colorant samples; (e) loading plots of principal component spectra of paper samples; and (f) loading plots of principal component spectra of black colorant samples. Solid lines show the first components and dotted lines show the second components.Source: reproduced with permission from Sugawara and Huck, 2020 14.…”

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confidence: 99%

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Novel near-infrared and Raman spectroscopic technologies for print and photography identification, classification, and authentication

2021

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Modern forensics encounters new challenges and demands new analytical methods that would meet variety of prerequisites regarding their accuracy, rapidness, flexibility, and reliability. Vibrational spectroscopic methods, in particular near-infrared spectroscopy, offer such potential and meet an increasing interest in forensics for authentication of various documents. Pittcon 2020 Conference, which took place in Chicago, Illinois, included a Session dedicated to the role of novel tools of investigation in the forensics of tomorrow. This article summarizes and complements the presentation upon how the current state-of-the-art and future prospects of vibrational spectroscopic techniques fits into this role. The application of near-infrared spectroscopy, including the benefits stemming from using novel miniaturized portable instruments, Raman and surface-enhanced Raman scattering techniques, is discussed in detail in the present article.

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Section: Document Examination In Forensic Applicationsmentioning

confidence: 99%

Section: Practical Application Potential Of Nir Spectroscopy Comparedmentioning

confidence: 99%

Section: Practical Application Potential Of Nir Spectroscopy Comparedmentioning

confidence: 99%

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confidence: 99%

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Novel near-infrared and Raman spectroscopic technologies for print and photography identification, classification, and authentication

2021

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“…Statistical analysis of the spectral groups can visualize differences in materials in the sample invisible to the naked eye. HSI is used in various elds [1][2][3][4][5][6][7][8][9][10][11] ; for example, Sugawara et al have studied applications such as inspecting document materials in forensic science and measuring paintings in cultural heritage science [12][13][14][15][16][17][18][19][20][21] . HSI techniques include visible (0.4-0.7 µm), near-infrared, mid-infrared, and far-infrared HSI, depending on the wavelength of light used.…”

Section: Introductionmentioning

confidence: 99%

Preliminary measurements of oil paint on paper using a mid-infrared hyperspectral imaging system with a bolometer camera and image interferometer.

Sugawara

Ishimaru

2023

Preprint

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The research focuses on developing a cutting-edge far-infrared HSI (Hyperspectral imaging) system using a bolometer camera, a unique instrument worldwide. This system has been utilized to conduct test measurements on various samples. While previous measurements with this system successfully captured the transmission of samples and the characteristics of inks and adhesives on aluminum plates, the current study introduces improvements in the instrument and measurement method. These advancements have allowed for measuring oil paints on paper, marking a significant achievement. Specifically, 16 different oil paints (four black, four white, four blue, and four red) were subjected to measurement. A compact far-infrared HSI instrument comprising an imaging interferometer and a bolometer camera was employed. The obtained spectra were compared with those obtained using another FTIR spectrometer. To ensure consistent measurements, the sample was rotated during the process, guaranteeing uniform spectra across the entire field of view of the instrument. The success or failure of each measurement was also determined by analyzing the amplitude of the interference signal in each pixel. The results revealed varying degrees of success among the measured oil paints, with paints exhibiting higher reflectance yielding better results, while paints with lower reflectance posed significant challenges. Furthermore, the success of the measurements was influenced by the orientation of the sample's undulating surface. These results show that oil paints can be measured with the world's first far-infrared HIS system with a bolometer camera.

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FGRC-Net: A high-information interactive convolutional neural network for identifying ink spectral information

Shi

Zhang

Kang

et al. 2024

Expert Systems with Applications

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Preliminary study on using near-infrared spectroscopy at 1.6–2.4 µm for document examination

Cited by 7 publications

References 26 publications

Novel near-infrared and Raman spectroscopic technologies for print and photography identification, classification, and authentication

Novel near-infrared and Raman spectroscopic technologies for print and photography identification, classification, and authentication

Preliminary measurements of oil paint on paper using a mid-infrared hyperspectral imaging system with a bolometer camera and image interferometer.

FGRC-Net: A high-information interactive convolutional neural network for identifying ink spectral information

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