Dr. Shigeru Sugawara Profile

Dr. Shigeru Sugawara

at National Research Institute of Police Science

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Publications (4)

Proceedings Article | 21 October 2016 Presentation + Paper

Middle infrared hyperspectral imaging of adhesives, varnishes and inks on Al plate and papers by using a bolometer camera and an imaging type interferometer

Shigeru Sugawara, Mitsuhiro Yoshida, Tsubasa Saito, Yoshihiko Nakayama, Yasuyuki Tsutsui, Hideya Taniguchi, Ichiro Ishimaru

Proceedings Volume 9987, 99870B (2016) https://doi.org/10.1117/12.2241329

KEYWORDS: Hyperspectral imaging, Bolometers, Interferometers, Adhesives, Aluminum, Cameras, Visualization, Spectroscopy, Imaging spectroscopy, Principal component analysis

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We built a hyperspectral imaging apparatus using middle-infrared light of 8–14 μm, which has a strong ability to identify organic materials, and attempted visualization of the distribution of organic materials that could not be identified by a naked eye. For this purpose, we utilized a low-cost bolometer camera (Nippon Avionics co., ltd. C100V, Japan) for its easy availability rather than an expensive mercury cadmium telluride (MCT) array sensor. To compensate for the low sensitivity of this bolometer, we adopted a Fourier-type spectroscopic system (Aoi Electronics co. ltd., Japan) using an imaging interferometer devised by the Kagawa University, Japan; this interferometer has higher light-utilization efficiency than Michelson interferometers, which are used in popular interferometry techniques.

In this study, 4 types of adhesives, 9 types of varnishes and more than 50 types of inks were put on Al plates of size 10 cm × 10 cm and were used as samples. Glossy paper for printing photos with an inkjet printer was also used as a sample. A 300 °C black body of size 15 cm × 15 cm was used as a light source. Spectra of 320 × 240 points were measured at a wavelength resolution of approximately 9 cm⁻¹. The mirror was scanned only once. The measurement time was approximately 30 s.

Hyperspectral images of adhesives, varnishes and inks on Al plate and paper were successfully measured. Spectra over a 5 × 5-pixel neighborhoods were averaged, and the averaged spectra were compared with those measured by a commercially available Fourier transform infrared (FTIR) spectroscopy. The averaged and measured spectra had absorption peaks at the same wavelengths. Furthermore, by analyzing the measured spectra, the distribution of substances invisible to the naked eye was visualized. Our results show that if low-absorbance organic materials are put on a high-reflectance surface such as an Al plate, the middle-infrared hyperspectral imaging could be measured using a bolometer. Additionally, hyperspectral imaging of high-reflectance paper, such as glossy paper, could also be measured. Because a bolometer camera is much cheaper than an MCT array, hyperspectral imaging with such a camera has many potential applications. Moreover, an imaging interferometer, with its high efficiency of light utilization, is very suitable for the purpose.

Proceedings Article | 21 October 2015 Paper

Tests of various colorants for application of a Fourier transform infrared imaging system to deciphering obliterated writings

Shigeru Sugawara

Proceedings Volume 9652, 965205 (2015) https://doi.org/10.1117/12.2194652

KEYWORDS: Reflectivity, FT-IR spectroscopy, Spectroscopy, Infrared imaging, Imaging spectroscopy, Imaging systems, Visible radiation, Information security, Infrared radiation, Absorption

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Proceedings Article | 29 May 2014 Paper

Application of a Fourier-transform infrared imaging system to deciphering obliterated writings for forensic purposes

Shigeru Sugawara

Proceedings Volume 9073, 90730D (2014) https://doi.org/10.1117/12.2049894

KEYWORDS: Spectroscopy, Infrared imaging, FT-IR spectroscopy, Reflectivity, Imaging spectroscopy, Forensic science, Sensors, Photography, Infrared radiation, Near infrared spectroscopy

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Proceedings Article | 19 April 2002 Paper

Discrimination of inkjet-printed counterfeits by spur marks and feature extraction by spatial frequency analysis

Yoshinori Akao, Kazuhiko Kobayashi, Shigeru Sugawara, Yoko Seki

Proceedings Volume 4677, (2002) https://doi.org/10.1117/12.462704

KEYWORDS: Inkjet technology, Infrared radiation, Visualization, Infrared imaging, Printing, Feature extraction, Spatial frequencies, Light sources and illumination, Radon transform, Binary data

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