Parameter Calculation of Splitting Mirrors in Optical-Butting Focal Plane

Fuqiang, 李富强 Li; Xiaohong, 张孝弘 Zhang; Weijun, 蔡伟军 Cai; Junlei, 常君磊 Chang; Junjie, 范俊杰 Fan; Lianying, 窦莲英 Dou; Xuemin, 魏学敏 Wei; Yang, 高扬 Gao; Lingyan, 高凌雁 Gao

doi:10.3788/aos202040.1308001

Cited by 2 publications

(1 citation statement)

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“…The RGB filter wheel is equipped with three monochrome filters that can be rotated around its axis to switch between filters and acquire the three primary color images of the target [10]. The field-of-view stitching component is primarily used for optical path division, achieving imaging field-of-view stitching for multiple detectors to meet the requirements of large-format imaging [11][12][13].…”

Section: System Working Principlementioning

confidence: 99%

Design of a Large-Format Low-Light Imaging System Based on the RGB Filter Wheel

Peng,

Yang,

Song

et al. 2023

Photonics

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In order to capture true-color information of distant targets under extremely low light, a large-format low-light imaging system is designed based on an RGB filter wheel. By decomposing the system indicators, this study proposes a method for acquiring low-light true-color images using a large-aperture, low-distortion optical lens combined with an RGB filter wheel capable of multi-line sequential exposure. The optical field segmentation is achieved using a four-panel optical reflective prism, and the images from four high-sensitivity SCOMS detectors are stitched together to form a composite image. The working principle of the system is explained, and the low-light imaging capability is thoroughly evaluated. The dimensions and rotation speed of the filter wheel are then calculated in detail, ensuring accurate synchronization of the filter wheel’s speed and exposure time. The calculation method for the parameters of the four-panel reflective prism structure is investigated, mathematical expressions for the geometric parameters of the prism assembly are provided, and a prism assembly suitable for four-way spectral separation is designed. Based on the research and design results, a large-swath-width, low-light true-color imaging system is developed that is suitable for an environmental illuminance of 0.01 lux. The system achieves a ground pixel resolution of 0.5 m (at an altitude of 5 km) and an effective image resolution of 4 K × 4 K, and is capable of accurately reproducing target color information. Laboratory and field flight tests verified that the large-swath-width images obtained by the imaging system are clear, with high contrast and resolution. After image fusion and spectral registration, the color images exhibit full saturation and high fidelity, meeting the requirements of low-light true-color imaging under airborne conditions. The design methodology of this low-light imaging system can serve as a reference for the development of airborne low-light imaging equipment.

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Section: System Working Principlementioning

confidence: 99%

Design of a Large-Format Low-Light Imaging System Based on the RGB Filter Wheel

Peng,

Yang,

Song

et al. 2023

Photonics

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Design of an Airborne Low-Light Imaging System Based on Multichannel Optical Butting

Peng,

Yang,

Lei

et al. 2024

Photonics

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For the purpose of achieving long-range, high-resolution, and ultra-wide-swath airborne earth imaging at extremely low-light levels (0.01 Lux), a low-light imaging system built on multi-detector optical butting was researched. Having decomposed the system’s specifications and verified its low-light imaging capability, we proposed to employ an optical system with a large relative aperture and low distortion and achieve imaging through the field-of-view (FOV) butting facilitated by eight 1080P high-sensitivity scientific complementary metal-oxide semiconductor (SCMOS) detectors. This paper elaborates on the design concept of the mechanical configuration of the imaging system; studies the calculation method of the structural parameters of the reflection prism; provides mathematical expressions for geometric parameters, such as the length and width of the splicing prism; and designs in detail the splicing structure of six reflection prisms for eight-channel beam splitting. Based on the design and computational results, a high-resolution, wide-swath imaging system for an ambient illuminance of 0.01 Lux was developed. Exhibiting a ground sampling distance (GSD) of 0.5 m (at a flight height of 5 km), this low-light imaging system keeps the FOV overlap ratio between adjacent detectors below 3% and boasts an effective image resolution of 4222 × 3782. The results from flight testing revealed that the proposed imaging system is capable of generating wide-swath, high-contrast resolution imagery under airborne and low-light conditions. As such, the way the system is prepared can serve as a reference point for the development of airborne low-light imaging devices.

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Parameter Calculation of Splitting Mirrors in Optical-Butting Focal Plane

Cited by 2 publications

References 0 publications

Design of a Large-Format Low-Light Imaging System Based on the RGB Filter Wheel

Design of a Large-Format Low-Light Imaging System Based on the RGB Filter Wheel

Design of an Airborne Low-Light Imaging System Based on Multichannel Optical Butting

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