Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope

Xie, Yanxia; Mao, Xianglong; Li, Jinpeng; Wang, Fengbiao; Wang, Peng; Gao, Rong; Li, Xing; Ren, Shangjie; Xu, Zhichen; Dong, Rongguang

doi:10.1364/ao.379324

Cited by 32 publications

(15 citation statements)

References 25 publications

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“…The IR targets in public datasets are typically bigger than 3 × 3, and it is hard to acquire images with single-pixel or small-scale target, which are quite significant in the application of the long-distance imaging systems. To evaluate the all-aluminum unobscured twomirror freeform imaging lens [26] and thermal characteristics of the high-performance camera, we developed a 3.7~4.8 µm MWIR camera and a 7.7-9.7 µm LWIR camera with a resolution of 1024 × 1024 and 512 × 512, respectively. The focal lengths of MWIR and LWIR cameras are 21 and 75 mm, respectively.…”

Section: Motivation and Preparation For The Experimentsmentioning

confidence: 99%

New Results on Small and Dim Infrared Target Detection

Wang

Zhao

Kwan

et al. 2021

Sensors

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Real-time small infrared (IR) target detection is critical to the performance of the situational awareness system in high-altitude aircraft. However, current IR target detection systems are generally hardware-unfriendly and have difficulty in achieving a robust performance in datasets with clouds occupying a large proportion of the image background. In this paper, we present new results by using an efficient method that extracts the candidate targets in the pre-processing stage and fuses the local scale, blob-based contrast map and gradient map in the detection stage. We also developed mid-wave infrared (MWIR) and long-wave infrared (LWIR) cameras for data collection experiments and algorithm evaluations. Experimental results using both publicly available datasets and image sequences acquired by our cameras clearly demonstrated that the proposed method achieves high detection accuracy with the mean AUC being at least 22.3% higher than comparable methods, and the computational cost beating the other methods by a large margin.

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Section: Motivation and Preparation For The Experimentsmentioning

confidence: 99%

New Results on Small and Dim Infrared Target Detection

Wang

Zhao

Kwan

et al. 2021

Sensors

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“…We can optimize the entire process of optical system design, manufacturing, testing, assembly, adjustment, and realize optical-mechanical integrated manufacturing by using metal optical components. Therefore, the optical systems with metal elements have advantages with a more compact structure, shorter development and production cycle, and higher product cost performance [ 6 , 7 ]. According to the calculation of Raytheon, the manufacturing cost of metal mirrors is much lower than ceramics and glass mirrors [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

A High Efficiency and Precision Smoothing Polishing Method for NiP Coating of Metal Mirror

Peng

Liu

et al. 2022

Micromachines

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The NiP coating has excellent wear and corrosion resistance, and electroless nickel-phosphorus coating is one of the best measures for surface modification of metal optical devices. The NiP layer could be processed by single-point diamond turning (SPDT). However, the periodic marks on the surface of the NiP coating processed by SPDT will lead to diffraction and stray light, which will reduce the reflectivity and image quality of the mirror. This paper studied smoothing polishing based on chemical mechanical polishing to remove turning periodic marks efficiently. Firstly, we studied the chemical corrosion and mechanical removal mechanism of smoothing polishing of the NiP coating through theoretical analysis. Then, the influencing factors of processing the quality of smoothing polishing are analyzed, and the optimal machining parameters and polishing slurry formula are formulated. Finally, through the developed process, the surface roughness of Root Mean Square (RMS) 0.223 nm is realized on the NiP coating, and an ultra-smooth surface that can meet the service accuracy of a hard X-ray mirror is obtained. Our research simplifies the high-precision machining process of the NiP coating and improves the machining efficiency. Therefore, it can be used as a new high-precision manufacturing NiP coating method.

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“…The metal mirrors stand out from the crowd with their distinctive advantages: easy to process and manufacture, extremely lightweight, short fabrication time, and low cost [4,5]. Moreover, with ultra-precision machining technology such as single-point diamond turning (SPDT), metal mirrors can be efficiently machined to the optical accuracy range [6][7][8][9][10][11][12]. Currently, beryllium and aluminum are two kinds of materials that are widely used in metal mirrors.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a lot of research has been done to develop metal mirrors with a lighter weight and better structural rigidity to meet the requirements of optical systems. such as single-point diamond turning (SPDT), metal mirrors can be efficiently machined to the optical accuracy range [6][7][8][9][10][11][12]. Currently, beryllium and aluminum are two kinds of materials that are widely used in metal mirrors.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

et al. 2021

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In recent years, much progress has been made on the development of metal mirrors based on additive manufacturing (AM). The sandwich mirror is well known for its excellent mechanical properties and challenging machining. Now, AM can be used to fabricate this complex structure and reduce the processing time and cost. In addition, with the aid of some new design methods for additive manufacturing, such as lattice, topology optimization (TO), and Voronoi, the freedom of mirror structure design is enormously improved. The common materials of mirrors include ceramics (SiC), glasses (glass ceramics, fused silica), and metals (aluminum, beryllium). Among them, the AM technology of metals is the most mature and widely used. Researchers have recently extensively developed the new-generation metal mirror to improve performance and lightweight rate. This review focuses on the following topics: (1) AM technologies and powder materials for metal mirrors, (2) recent advances in optomechanical design methods for AM metal mirrors, (3) challenges faced by AM metal mirrors in fabricating, and (4) future trends in AM metal mirrors.

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Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope

Cited by 32 publications

References 25 publications

New Results on Small and Dim Infrared Target Detection

New Results on Small and Dim Infrared Target Detection

A High Efficiency and Precision Smoothing Polishing Method for NiP Coating of Metal Mirror

Design and Fabrication Technology of Metal Mirrors Based on Additive Manufacturing: A Review

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