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- 저자 : Tan Shuanglong (검색결과 2 건)
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Design and Manufacture of an Off-axis Aluminum Mirror for Visible-light Imaging
Jizhen Zhang,Xin Zhang,Shuanglong Tan,Xiaolin Xie 한국광학회 2017 Current Optics and Photonics Vol.1 No.4
Compared to one made of glass, an aluminum mirror features light weight, compact design, low cost,and quick manufacturing. Reflective mirrors and supporting structures can be made from the same material,to improve the athermal performance of the system. With the rapid development of ultraprecise machiningtechnologies, the field of applications for aluminum mirrors has been developed rapidly. However, mostof them are rotationally symmetric in shape, and are used for infrared applications. In this paper, the designand manufacture of an off-axis aluminum mirror used for a three-mirror-anastigmat (TMA) optical systemat visible wavelengths is presented. An optimized, lightweight design provides a weight reduction of morethan 40%, while the surface deformation caused by earth’s gravity can meet the required tolerance. Thetwo pieces of an off-axis mirror can be diamond-turned simultaneously in one setup. The centrifugaldeformation of the off-axis mirror during single-point diamond turning (SPDT) is simulated through thefinite-element method (FEM). The techniques used to overcome centrifugal deformation are thoroughlydescribed in this paper, and the surface error is reduced to about 1% of the original value. Afterpost-polishing, the form error is 1/30 λ RMS and the surface roughness is better than 5 nm Ra, whichcan meet the requirements for visible-light imaging.
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Design and Development of a Single-photon Laser and Infrared Common Aperture Optical System
Wu Hongbo,Zhang Xin,Tan Shuanglong,Liu Mingxin,Wang Lingjie,Yan Lei,Liu Yang,Shi Guangwei 한국광학회 2022 Current Optics and Photonics Vol.6 No.2
A single-photon laser and mid-wave infrared (MWIR) common aperture optical system was designed and developed to detect and range a long-distance civil aviation aircraft. The secondary mirror of the Ritchey-Chretien (R-C) optical system was chosen as a dichroic lens to realize the design of a common aperture system for the laser and MWIR. Point spread function (PSF) ellipticity was introduced to evaluate the coupling efficiency of the laser receiving system. A small aperture stop and narrow filter were set in the secondary image plane and an afocal light path of the laser system, respectively, and the stray light suppression ability of the small aperture stop was verified by modeling and simulation. With high-precision manufacturing technology by single point diamond turning (SPDT) and a high-efficiency dichroic coating, the laser/MWIR common aperture optical system with a φ300 mm aluminum alloy mirror obtained images of buildings at a distance of 5 km with great quality. A civil aviation aircraft detection experiment was conducted. The results show that the common aperture system could detect and track long-distance civil aviation aircraft effectively, and the coverage was more than 450 km (signal-tonoise ratio = 6.3). It satisfied the application requirements for earlier warning and ranging of long-range targets in the area of aviation, aerospace and ground detection systems.
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