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Proceedings Paper

Palm-sized (80-mm cube weighing 0.5 kg) low-price (several thousand USD) mid-infrared (wavelength 8–14 µm) Fourier spectroscopic imager
Author(s): Ichiro Ishimaru
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Paper Abstract

A mid-infrared spectroscopic imager needs to be portable and tough for mounting on drones or small satellites. 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 wavefrontdivision phase-shift interferometer as an imaging-type two-dimensional 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 low-price 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 lowprice (1,000 USD) and tough phase-shift stage with cross-roller linear-motion guides.

Paper Details

Date Published: 6 September 2019
PDF: 7 pages
Proc. SPIE 11130, Imaging Spectrometry XXIII: Applications, Sensors, and Processing, 111300G (6 September 2019); doi: 10.1117/12.2541389
Show Author Affiliations
Ichiro Ishimaru, Kagawa Univ. (Japan)

Published in SPIE Proceedings Vol. 11130:
Imaging Spectrometry XXIII: Applications, Sensors, and Processing
Emmett J. Ientilucci, Editor(s)

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