Zoom lens with large aperture and long focal length in the integration system of detection and recognition

2021 ◽  
Author(s):  
Rui Yao ◽  
Xuyang Li ◽  
Zixuan Ma ◽  
Zhiguang Ren ◽  
Nanqing Chu
Keyword(s):  
Focal Length ◽  
Zoom Lens ◽  
Integration System ◽  
Large Aperture ◽  
Detection And Recognition

Structural Calculation and Optimal Design of Large-Aperture Long-Focal-Length Full-Frame Zoom Lens

2019 ◽  
Vol 56 (9) ◽  
pp. 092201
Author(s):  
温林凯 Wen Linkai ◽  
刘英 Liu Ying ◽  
姜洋 Jiang Yang ◽  
邢妍 Xing Yan ◽  
孙强 Sun Qiang
Keyword(s):  
Optimal Design ◽  
Focal Length ◽  
Zoom Lens ◽  
Large Aperture ◽  
Structural Calculation

Long focal length and large aperture zoom optical system

2021 ◽  
Author(s):  
Wei-jun Chang ◽  
Bo Zhang ◽  
Ge-ping Cao
Keyword(s):  
Optical System ◽  
Focal Length ◽  
Large Aperture

Design of Large Aperture Offaxis Middle Infrared Continuous Zoom Lens

2014 ◽  
Vol 43 (6) ◽  
pp. 622004
Author(s):  
汪大宝 WANG Dabao ◽  
姜凯 JIANG Kai ◽  
赵士民 ZHAO Shimin ◽  
郝伟 HAO Wei ◽  
江波 JIANG Bo ◽  
...  
Keyword(s):  
Zoom Lens ◽  
Large Aperture ◽  
Middle Infrared

Design of Long-Wave Infrared Scan System with Rotating Dual-Wedge Prism

2013 ◽  
Vol 552 ◽  
pp. 27-32
Author(s):  
Zhe Yuan Fan ◽  
Li Min Gao ◽  
Hong Tao Yang ◽  
Wei Ning Chen ◽  
Jian Zhong Cao ◽  
...  
Keyword(s):  
Focal Length ◽  
Chromatic Aberration ◽  
Energy Concentration ◽  
Large Field ◽  
Modulation Transfer ◽  
Sensing Element ◽  
Large Aperture ◽  
Long Wave ◽  
Good Imaging ◽  
Wedge Prism

Due to the possession of advantages of passivity working mode, good disguise, and easy observation, infrared systems are used in a wide variety of applications. This paper using 640×480 uncooled detector designed a long-wave scan optical system with large field and large aperture working at 8.0μm～12μm, the Pixel Dimensions of the detector is 30μm. The F number of this system is 1.4 and focal length is 17mm, FOV is 63.6°, which extended to 143° by adopting dual-wedge prism rotating, the paper also given the extended field theory by the dual-wedge prism. Because there are a limited number of lens materials used in LWIR spectral bands, Germanium material and three aspheric surfaces were adopted to balance sphere aberrations and chromatic aberration. All above mentioned are intending to ensure the system has good imaging quality. The results show that the optical performance approximates to the diffraction limit and the design has better achromatic performance. The modulation transfer function (MTF) is above 0.5 at spatial frequency of 20lp/mm, energy concentration ratio is greater than 70% within the sensing element of the detector and Root Mean Square (RMS) value of spot diameter is smaller than the Pixel Dimensions. The system has advantages of simple structure, large aperture, high image quality etc.

118 Long Focal Length Testing for Large Aperture Lens

2003 ◽  
Vol 2003 (0) ◽  
pp. 89-94
Author(s):  
Jian Bai ◽  
Changlun Hou ◽  
Xiyun Hou ◽  
Chen Sun ◽  
Guoguang Yang
Keyword(s):  
Focal Length ◽  
Large Aperture

scholarly journals Large-aperture laser differential confocal ultra-long focal length measurement and its system

2015 ◽  
Vol 23 (13) ◽  
pp. 17379 ◽  
Author(s):  
Weiqian Zhao ◽  
Zhigang Li ◽  
Lirong Qiu ◽  
Huan Ren ◽  
Rongjun Shao
Keyword(s):  
Focal Length ◽  
Length Measurement ◽  
Large Aperture
Sign in / Sign up

Export Citation Format

Share Document