Design of polarized infrared athermal telephoto objective for penetrating the fog

Duorui Gao; Qiang Fu; Zhao Zhao; Bin Zhao; Lijun Zhong; Juntong Zhan

doi:10.1117/12.2072669

20 November 2014 Design of polarized infrared athermal telephoto objective for penetrating the fog

Duorui Gao, Qiang Fu, Zhao Zhao, Bin Zhao, Lijun Zhong, Juntong Zhan

Proceedings Volume 9300, International Symposium on Optoelectronic Technology and Application 2014: Infrared Technology and Applications; 93001W (2014) https://doi.org/10.1117/12.2072669
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

Polarized infrared imaging technology is a new detection technique which own the ability of spying through the fog, highlighting the target and recognizing the forgeries, these characters make it a good advantage of increasing the work distance in the fog. Compared to the traditional infrared imaging method, polarized infrared imaging can identify the background and target easily, that is the most distinguishing feature of polarized infrared imaging technology. Owning to the large refractive index of the infrared material, temperature change will bring defocus seriously, athermal infrared objective is necessarily. On the other hand, athermal objective has large total length, and hard to be integrated for their huge volume. However telephoto objective has the character of small volume and short total length. The paper introduce a method of polarized and athermal infrared telephoto objective which can spy the fog. First assign the optical power of the fore group and the rear group on the basis of the principle of telephoto objective, the power of the fore group is positive and the rear group is negative; then distribute the optical power within each group to realize the ability of athermalization, finally computer-aided software is used to correct aberration. In order to prove the feasibility of the scheme, an athermal optical system was designed by virtue of ZEMAX software which works at 8~12 µm, the focal length of 150mm, F number is 2, and total length of the telephoto objective is 120mm. The environment temperature analysis shows that the optical system have stable imaging quality, MTF is close to diffraction limit. This telephoto objective is available for infrared polarized imaging.

Citation Download Citation

Duorui Gao, Qiang Fu, Zhao Zhao, Bin Zhao, Lijun Zhong, and Juntong Zhan "Design of polarized infrared athermal telephoto objective for penetrating the fog", Proc. SPIE 9300, International Symposium on Optoelectronic Technology and Application 2014: Infrared Technology and Applications, 93001W (20 November 2014); https://doi.org/10.1117/12.2072669

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KEYWORDS

Infrared imaging

Infrared radiation

Optical design

Thermography

Fiber optic gyroscopes

Long wavelength infrared

Germanium

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