Study on the properties of infrared wavefront coding athermal system under several typical temperature gradient distributions

Huai-yu Cai; Xiao-tong Dong; Meng Zhu; Zhan-hua Huang

doi:10.1117/12.2287646

12 January 2018 Study on the properties of infrared wavefront coding athermal system under several typical temperature gradient distributions

Huai-yu Cai, Xiao-tong Dong, Meng Zhu, Zhan-hua Huang

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Proceedings Volume 10620, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology; 106200D (2018) https://doi.org/10.1117/12.2287646
Event: International Conference on Optical Instruments and Technology 2017, 2017, Beijing, China

Abstract

Wavefront coding for athermal technique can effectively ensure the stability of the optical system imaging in large temperature range, as well as the advantages of compact structure and low cost. Using simulation method to analyze the properties such as PSF and MTF of wavefront coding athermal system under several typical temperature gradient distributions has directive function to characterize the working state of non-ideal temperature environment, and can effectively realize the system design indicators as well. In this paper, we utilize the interoperability of data between Solidworks and ZEMAX to simplify the traditional process of structure/thermal/optical integrated analysis. Besides, we design and build the optical model and corresponding mechanical model of the infrared imaging wavefront coding athermal system. The axial and radial temperature gradients of different degrees are applied to the whole system by using SolidWorks software, thus the changes of curvature, refractive index and the distance between the lenses are obtained. Then, we import the deformation model to ZEMAX for ray tracing, and obtain the changes of PSF and MTF in optical system. Finally, we discuss and evaluate the consistency of the PSF (MTF) of the wavefront coding athermal system and the image restorability, which provides the basis and reference for the optimal design of the wavefront coding athermal system. The results show that the adaptability of single material infrared wavefront coding athermal system to axial temperature gradient can reach the upper limit of temperature fluctuation of 60°C, which is much higher than that of radial temperature gradient.

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Huai-yu Cai, Xiao-tong Dong, Meng Zhu, and Zhan-hua Huang "Study on the properties of infrared wavefront coding athermal system under several typical temperature gradient distributions", Proc. SPIE 10620, 2017 International Conference on Optical Instruments and Technology: Optoelectronic Imaging/Spectroscopy and Signal Processing Technology, 106200D (12 January 2018); https://doi.org/10.1117/12.2287646

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KEYWORDS

Wavefronts

Modulation transfer functions

Point spread functions

Thermography

Optical components

Thermal modeling

Zemax

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