Mr. Fenli Tan Profile

Fenli Tan

at Soochow Univ

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Proceedings Article | 9 October 2021 Paper

Optical design of a cascade airborne spectral imaging system with wide FOV and compactness

Chenxin Zeng, Fenli Tan, Yiqun Ji

Proceedings Volume 11895, 118950N (2021) https://doi.org/10.1117/12.2602651

KEYWORDS: Imaging spectroscopy, Imaging systems, Imaging arrays, Optical design, Objectives, Mirrors, Multichannel imaging systems

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In response to the demands of light weight, small size, wide field of view (FOV) and real time airborne spectral imaging, a novel spectral imaging system with lightweight and compactness is designed based on fold cascade structure. A concentric cascade spectral imaging system is studied. It mainly consists of two optics, a front fold monocentric objective and an Offner spectral imaging array. The front fold monocentric objective achieves an intermediate curved image with wide FOV, then the Offner spectral imaging array divides the intermediate image into sub-images and obtains spectral sub images through dispersion and reimaging. Based on the first-order theory and aberration characteristics, the cascade spectral imaging system is optimized. The optimized cascade spectral imaging system is with a real time full FOV of 110°, focal length of 110mm, F number of 4.8 and a working wavelength band of 480nm to 760nm. After performance evaluation, both its smile and keystone are well balanced. The spectral resolution is about 0.6nm, the maximum RMS radius on image plane is less than 3μm, and the MTF value is over 0.5@85 lp/mm. The tube length of the optimized system is only 85mm. The obtained cascade spectral imaging system not only achieves a real time spectral imaging in a wide FOV, but also realizes the miniaturization and lightness. It has a great potential application for airborne remote sensing and will make profound theorical value in this field.

Proceedings Article | 9 October 2021 Paper

Optical design of a novel Wynne-Offner snapshot hyperspectral imaging system

Fenli Tan, Chenxin Zeng, Yiqun Ji

Proceedings Volume 11895, 118950D (2021) https://doi.org/10.1117/12.2602654

KEYWORDS: Imaging systems, Hyperspectral imaging, Spectral resolution, Spectrographs, Optical design, Imaging spectroscopy, Spectrometers, Spatial resolution

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In response to the demands of wide field of view (FOV), high spatial resolution and high spectral resolution real time spectral imaging of dynamic scenes, a novel large aperture Wynne-Offner snapshot hyperspectral imaging system of concentric structure is designed. Astigmatism is the main residual aberration over the full FOV. Firstly, based on the first-order theory and aberration characteristics, the anastigmatic condition of the novel large aperture Wynne-Offner snapshot hyperspectral imaging system is analyzed. Then, to achieve a large FOV and to obtain minimum astigmatism, an aspheric surface was introduced to the proper surface. Finally, with a numerical aperture of 0.22 and the FOV of 14mm×3mm, a novel large aperture Wynne-Offner snapshot hyperspectral imaging system is optimized. The optimized system provides a data-cube of 112×24×293 samples over the 450-650nm working wave band. It achieves a spatial resolution of 9μm and a spectral resolution of 0.7nm. The astigmatism is less than 4μm and it verifies the correctness of the forward theory. The image quality evaluation shows that the root-mean-square radius of the spot diagram of the optimized system is less than 1μm and the MTF value is over 0.85@56 lp/mm. The smile and keystone are less than 1.4μm and 2.4μm, respectively. The excellent spectral imaging results demonstrate that the optimized system has a great potential application for real-time recognition of dynamic scenes. Moreover, the design method provides a profound theoretical reference for the design of snapshot hyperspectral imaging spectrometers

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