The development of a wide-field infrared spectroscopic imaging apparatus using a bolometer camera and feasibility test for forensic examination

Sugawara, Shigeru; Fujiwara, Masaru; Suzuki, Yo; Kawashima, Natsumi; Nakayama, Yoshihiko; Taniguchi, Hideya; Ishimaru, Ichiro

doi:10.1016/j.infrared.2015.04.016

Cited by 6 publications

(3 citation statements)

References 29 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

“…Sugawara et al have used this far-infrared HSI camera with a bolometer camera, which is unique in the world, to measure the transmittance of organic lms and the re ectance of adhesives and inks on aluminum plates 14,15,18,21 . Ishimaru et al, have measured microplastics and cosmetic creams on the face [27][28][29][30][31] .…”

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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“…By combining a bolometer detector with an imaging-type interferometer, which has high light-utilisation efficiency, we were able to produce a measurement apparatus that is inexpensive and easy to handle. Since the imaging-type interferometers are more compact than the Michelson-type interferometers, the whole apparatus also became compact and easy to handle 7 – 11 .…”

Section: Introductionmentioning

confidence: 99%

Wide-field mid-infrared hyperspectral imaging of adhesives using a bolometer camera

Sugawara

Nakayama²,

Taniguchi³

et al. 2017

Sci Rep

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By combining a bolometer detector with an imaging-type interferometer, an inexpensive, easy-to-handle wide-field mid-infrared hyperspectral imaging apparatus was produced. We measured the distributions of four types of thin adhesive layers on an aluminium plate and analysed the results using correlation coefficients to visualise the distribution of various adhesives that cannot be discerned by the naked eye or conventional methods such as visible/near-infrared spectroscopic/fluorescent photography. The measurement wavelength range, obtained spectrum’s wavenumber resolution, and measurement time was 8–14 μm, about 9 cm−1, and about 30 s, respectively. Using conventional methods, adhesives could not be distinguished from the others. By using this method, we found that adhesives could be precisely distinguished by setting an appropriate threshold value for the correlation coefficient. Thus, our approach can accurately measure the spatial distribution of different types of adhesive that cannot be discriminated by conventional methods.

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Forensic potential of atomic force microscopy

2016

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The development of a wide-field infrared spectroscopic imaging apparatus using a bolometer camera and feasibility test for forensic examination

Cited by 6 publications

References 29 publications

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

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

Wide-field mid-infrared hyperspectral imaging of adhesives using a bolometer camera

Forensic potential of atomic force microscopy

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