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Appl. Sci. 2017, 7(11), 1195; https://doi.org/10.3390/app7111195

Design and Tests of a High-Performance Long-Wave Infrared Refractive Thermal Imager: Freeform Lens in Coaxial System

1
Institute of Physics, Kunming 650223, China
2
Laboratory of Precision Measuring Technology & Instruments, Centre of MicroNano Manufacturing Technology, Tianjin University, Tianjin 300072, China
*
Author to whom correspondence should be addressed.
Received: 18 October 2017 / Accepted: 10 November 2017 / Published: 20 November 2017
(This article belongs to the Section Optics and Lasers)
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Abstract

In this paper, we used a freeform lens in a long-wave, un-cooled, refractive infrared (IR) thermal imager and present the design strategy and test results. This optical system is composed of only one freeform lens and several spheres. It can correct the distortion issue inherent to wide field-of-view systems more effectively, and achieve a better thermal imaging performance simultaneously compared to traditional aspheric optical lenses. Such a design model can alleviate the calculation load and cater for the demand of the ultra-precision turning on single crystal germanium. It satisfies the design idea of freeform surfaces with machining feasibility. The refractive freeform IR imager can be realized from the theoretical design to the engineering applications. The research contents of this paper are helpful for the further application of the freeform lens to a more complex cooled infrared refractive thermal imager. View Full-Text
Keywords: imaging systems; optical design and fabrication; infrared; geometric optical design imaging systems; optical design and fabrication; infrared; geometric optical design
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Chen, J.; Su, J.; Jin, N.; Li, Z.; Zhang, X.; Zhang, H.; Zhou, L. Design and Tests of a High-Performance Long-Wave Infrared Refractive Thermal Imager: Freeform Lens in Coaxial System. Appl. Sci. 2017, 7, 1195.

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