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Chao Mei

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Proceedings Article | 14 November 2023 Paper

Research on rocket engine pose measurement technology based on monocular vision

Haifeng Zhang, Jiaxin Wu, Delian Liu, Jiaxin Duan, Gao Guo, Gaopeng Zhang, Long Ren, Jianzhong Cao, Chao Mei

Proceedings Volume 12934, 129340I (2023) https://doi.org/10.1117/12.3008182

KEYWORDS: Distortion, Feature extraction, Rockets, Tunable filters, Spatial filtering, Light sources and illumination, Image processing, Digital filtering, Detection and tracking algorithms, Denoising

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In recent years, in the aerospace field, higher requirements have been put forward for the position and pose measurement tasks such as engines. Computer vision technology is the key technology to achieve the target measurement tasks. Rocket engine pose measurement provides technical support for engine pose control strategy optimization. Based on the principle of monocular vision, this article designs a measurement system with strong stability and high accuracy for launch vehicle engines, and verifies the effectiveness of the measurement system through two sets of simulation experiments. In terms of image preprocessing, the noise reduction effects of spatial filtering and wavelet transform were compared, and a preprocessing method combining wavelet transform and image enhancement was designed; In terms of feature extraction, improvements have been made to the traditional Accelerated Feature Segmentation Test (FAST) algorithm to reduce the impact of lighting on feature point extraction under different postures, while retaining the advantage of high-precision measurement algorithms under point features; In terms of pose measurement, the centroid and translation vector pre pose iterative optimization algorithm is adopted, which greatly reduces the computational complexity in the pose calculation iteration process and improves the speed of spatial target pose calculation.

Proceedings Article | 12 April 2023 Paper

Optical passive athermalization design of a catadioptric infrared optical system with large aperture and long focal length

Wen Cui, Aqi Yan, Chao Mei, Weining Chen

Proceedings Volume 12565, 1256505 (2023) https://doi.org/10.1117/12.2661520

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In view of the problem that the imaging quality of the large-aperture and long-focal length infrared optical system is sensitive to temperature changes. In this paper, we propose an idea of combining athermalization design with catadioptric optical system, and a large-aperture long-focal length catadioptric infrared optical system is designed by this idea. According to the influence of each parameter by environmental changes, the system optical power is allocated reasonably. Select the appropriate infrared lens material and reflector base material for the system so that the image plane deviation caused by the environmental changes of the components cancel each other out. The design method and idea proposed in this paper have important reference value for the realization of heat dissipation of catadioptric optical system. The working band of the system is 8~14μⅿ,the focal length is 250ⅿⅿ, F-number is 1, and the three infrared materials used in the system are HWS2, HWS9 and IRG22. The design results show that the system can maintain high imaging quality in the temperature range of -40°C~+60°C, with the modulation transfer function (MTF) curves close to the diffraction limit at the cutoff frequency. The design methods and ideas proposed in this paper have significant reference value for realizing athermalization of catadioptric optical systems.

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