Objective lens design of polarization imaging in haze environment

2017 ◽  
Author(s):  
Guanyu Wen ◽  
Shuang Wang ◽  
Juntong Zhan ◽  
Qiang Fu
Keyword(s):  
Objective Lens ◽  
Lens Design ◽  
Polarization Imaging

On the magnetic electron lens of minimum sphrical aberration

1978 ◽  
Vol 36 (1) ◽  
pp. 24-25
Author(s):  
S. Suzuki ◽  
A. Ishikawa
Keyword(s):  
Spherical Aberration ◽  
Resolving Power ◽  
Objective Lens ◽  
Lens Design ◽  
Magnetic Lens ◽  
Initial Voltage ◽  
Path Distance ◽  
Electron Lens ◽  
Image Position ◽  
Magnetic Electron

For the development of the electron microscope, in which high resolving power is demanded, it is important to construct an electron objective lens with minimum spherical aberration.In 1943, one of the authors published the paper on the approximate calculation of the electromagnetic field to give a minimum spherical aberration and also published the papers on small spherical aberration lens design based on this calculation.We will speak a comparison between the experimental results and the numerical calculations in practical cases.The following line shows the method to get more strictly minimum spherical aberration of magnetic lens.In a space charge free electron optical system, where a pure magnetic lens is concerned, differential equation for paraxial electron path is given byU being the initial voltage applied to the electron beam and γ the path distance from the optical axis Z.

Objective lens design of subminiature endoscope with image fiber bundles

2018 ◽  
Vol 39 (3) ◽  
pp. 114-118
Author(s):  
Zhu Xiaodong ◽  
Ye Bing ◽  
Li Kai ◽  
Ma Weidong
Keyword(s):  
Fiber Bundles ◽  
Objective Lens ◽  
Lens Design

Lens Design of Compatible Objective Lens for Blu-ray Disc and Digital Versatile Disk with Diffractive Optical Element and Phase Steps

2004 ◽  
Vol 43 (7B) ◽  
pp. 4742-4745 ◽  
Author(s):  
Yasuhiro Tanaka ◽  
Yoshiaki Komma ◽  
Yoshiyuki Shimizu ◽  
Tomoaki Shimazaki ◽  
Jun Murata ◽  
...  
Keyword(s):  
Optical Element ◽  
Diffractive Optical Element ◽  
Objective Lens ◽  
Lens Design ◽  
Digital Versatile Disk

Objective Lens Design of Electronic Endoscope with Front and Back Fields

2017 ◽  
Vol 54 (2) ◽  
pp. 022201
Author(s):  
王立明 Wang Liming ◽  
丁红昌 Ding Hongchang ◽  
向阳 Xiang Yang
Keyword(s):  
Objective Lens ◽  
Lens Design

45.5X Infinity Corrected Schwarzschild Microscope Objective Lens Design

2018 ◽  
Vol 7 (1) ◽  
pp. 17-37
Author(s):  
Sami D. Alaruri
Keyword(s):  
Sensitivity Analysis ◽  
Transfer Function ◽  
Modulation Transfer Function ◽  
Numerical Aperture ◽  
Objective Lens ◽  
Lens Design ◽  
Modulation Transfer ◽  
Microscope Objective ◽  
Spherical Mirrors ◽  
Microscope Objective Lens

In this article, the design of a 45.5X (numerical aperture (NA) =0.5) infinity corrected, or infinite conjugate, Schwarzschild reflective microscope objective lens is discussed. Fast Fourier transform modulation transfer function (FFT MTF= 568.4 lines/mm at 50% contrast for the on-axis field-of-view), root-mean-square wavefront error (RMS WFE= 0.024 waves at 700 nm), point spread function (PSF, Strehl ratio= 0.972), encircled energy (0.88 µm spot radius at 80% fraction of enclosed energy), optical path difference (OPD=-0.644 waves) and Seidel coefficients calculated with Zemax® are provided to show that the design is diffraction-limited and aberration-free. Furthermore, formulas expressing the relationship between the parameters of the two spherical mirrors and the Schwarzschild objective lens focal length are given. In addition, tolerance and sensitivity analysis for the Schwarzschild objective lens, two spherical mirrors indicate that tilting the concave mirror (or secondary mirror) has a higher impact on the modulation transfer function values than tilts introduced by the convex mirror (or primary mirror). Finally, the performed tolerance and sensitivity analysis on the lens design suggests that decentering any of the mirrors by the same distance has the same effect on the modulation transfer function values.

Objective lens design for image intensifier night vision sight

2001 ◽  
Author(s):  
Marinica Mirzu ◽  
Stefan Cantaragiu ◽  
Liviu Cosereanu ◽  
Daniel Ralea ◽  
Catalin A. Spulber
Keyword(s):  
Image Intensifier ◽  
Night Vision ◽  
Objective Lens ◽  
Lens Design
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