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Proceedings Paper

Palm-sized and tough two-dimensional spectroscopic imager: the so-called hyperspectral camera for visible and mid-infrared light (first report): trial applications of the proposed two-dimensional Fourier spectroscopic imager
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Paper Abstract

A mid-infrared spectroscopic imager needs to be portable and tough for the identification of dyestuffs used for murals in ancient tombs during archaeological on-site analysis. Meanwhile, an extremely compact and tough hyperspectral camera with mass less than 2 kg is required for mounting on drones to observe nutritive components like nitrogen and phosphorus. We proposed a near-common-path wavefront-division phase-shift interferometer as an imaging-type twodimensional Fourier spectrometer. Because the proposed interferometer has strong robustness against mechanical vibrations, a palm-sized Fourier spectroscopic imager can be realized without an anti-mechanical vibration system. We developed a palm-sized (80-mm cube weighing 0.5 kg) and tough hyperspectral camera for mid-infrared light (wavelength of 8–14 μm) that can be operated using only a notebook personal computer. Furthermore, the field of view of a conventional hyperspectral camera is narrow (e.g., 6.4 deg × 5.1 deg). However, employing a proposed field angle correlation method and using a fisheye lens as the objective lens, the field of view can be expanded to 180 deg. The total price of the mid-infrared two-dimensional spectroscopic imager is no more than several thousand USD because a lowprice microbolometer (Vision Sensing, VIM-80G2, wavelength range: 8-14 μm, 80 × 80 pixels, price: 300 USD) is used. Additionally, a long-stroke (10 mm) and high-resolution (Optical encoder resolution: 100 nm) impact-drive actuator (Technohands XCWT70-10 weighing 30 g) is introduced as a low-price (1000 USD) and tough phase-shift stage with cross-roller linear-motion guides.

Paper Details

Date Published: 12 July 2019
PDF: 6 pages
Proc. SPIE 11058, Optics for Arts, Architecture, and Archaeology VII, 110580V (12 July 2019); doi: 10.1117/12.2525654
Show Author Affiliations
Ichiro Ishimaru, Kagawa Univ. (Japan)
Hanyue Kang, Kagawa Univ. (Japan)
Natsumi Kawashima, Kagawa Univ. (Japan)
Tomoya Kitazaki, Kagawa Univ. (Japan)
Jyunya Iwaki, Kagawa Univ. (Japan)
Satoru Adachi, Kagawa Univ. (Japan)
Sora Mizutani, Kagawa Univ. (Japan)
Kotone Yokoyama, Kagawa Univ. (Japan)

Published in SPIE Proceedings Vol. 11058:
Optics for Arts, Architecture, and Archaeology VII
Haida Liang; Roger Groves; Piotr Targowski, Editor(s)

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