50‐4: Optical Design of Corner‐Cube Retroreflectors with Inclined Curved Optical Surfaces for Directional Scattering Projector Screen

2021 ◽  
Vol 52 (1) ◽  
pp. 694-697
Author(s):  
K. Käläntär ◽  
T. Uchida
Keyword(s):  
Optical Design ◽  
Corner Cube ◽  
Optical Surfaces

Freeform Optical Surfaces: A Revolution in Imaging Optical Design

2012 ◽  
Vol 23 (6) ◽  
pp. 30 ◽  
Author(s):  
Kevin P. Thompson ◽  
Jannick P. Rolland
Keyword(s):  
Optical Design ◽  
Optical Surfaces

Optical design of LED high mast lamp based on TIR freeform lens for annular lighting

2020 ◽  
pp. 147715352097452
Author(s):  
D Pan ◽  
YC Zhang ◽  
XF Xie ◽  
MJ Fan ◽  
YA Chen ◽  
...  
Keyword(s):  
Outer Surface ◽  
Design Method ◽  
Optical Design ◽  
Large Angle ◽  
Target Surface ◽  
Optical Surfaces ◽  
Road Lighting ◽  
Street Lamp ◽  
Square Spot ◽  
Illuminance Uniformity

The traditional square spot of street lamp is not suitable for the lighting requirements of the annular road lighting. In this paper, a lens design method for producing annular spot of high mast lamp is proposed. The method mainly contains three optical surfaces, in which the inner surface collimates the energy of the centre part of the light source, the total internal reflection surface collimates the light with large angle and low energy and the outer surface refracts all the collimated light to realise the annular illumination distribution on the target surface. In this design, we can change the diameter of the lighting spot through the variation of the inclination angle of the outer surface from 14° to 19° and the diameter of the spot changes from 10.2 m to 12.3 m at the distance of 30 m. The lighting requirements of high mast lighting are realised based on the TIR lens array, in which the average illuminance is more than 20 lx, the illuminance uniformity is more than 0.7 and the light optical utilisation factor is more than 90%.

A Review of designing freeform optical surfaces by the Monge–Ampère equations

2021 ◽  
Vol 15 ◽  
Author(s):  
Kangsong Ji ◽  
Huahao Shou ◽  
Yan Liu
Keyword(s):  
Boundary Condition ◽  
Inverse Problem ◽  
Numerical Methods ◽  
Optical Design ◽  
Light Distribution ◽  
Geometric Optics ◽  
Freeform Surfaces ◽  
Optical Surfaces ◽  
Numerical Design ◽  
Monge Ampere

Background: The equations of Monge–Ampère type which arise in geometric optics is used to design illumination lenses and mirrors. The optical design problem can be formulated as an inverse problem: determine an optical system consisting of reflector and/or refractor that converts a given light distribution of the source into a desired target light distribution. For two decades, the development of fast and reliable numerical design algorithms for the calculation of freeform surfaces for irradiance control in the geometrical optics limit is of great interest in current research. Objective: The objective of this paper is to summarize the types, algorithms and applications of Monge–Ampère equations. It helps scholars to grasp the research status of Monge–Ampère equations better and to explore the theory of Monge–Ampère equations further. Methods: This paper reviews the theory and applications of Monge–Ampère equations from four aspects. We first discuss the concept and development of Monge–Ampère equations. Then we derive two different cases of Monge–Ampère equations. We also list the numerical methods of Monge–Ampère equation in actual scenes. Finally, the paper gives a brief summary and an expectation. Results: The paper gives a brief introduction to the relevant papers and patents of the numerical solution of Monge–Ampère equations. There are quite a lot of literatures on the theoretical proofs and numerical calculations of Monge–Ampère equations. Conclusion: Monge–Ampère equation has been widely applied in geometric optics field since the predetermined energy distribution and the boundary condition creation can be well satisfied. Although the freeform surfaces designing by the Monge–Ampère equations is developing rapidly, there are still plenty of rooms for development in the design of the algorithms.

Use of the Magnetostatic Analogue In Electromagnetic Lens Engineering

1970 ◽  
Vol 28 ◽  
pp. 360-361
Author(s):  
John W. Coleman
Keyword(s):  
Boundary Conditions ◽  
High Performance ◽  
Force Fields ◽  
Optical Design ◽  
Direct Conversion ◽  
Design Engineering ◽  
Design Data ◽  
Scalar Potentials ◽  
Geometric Elements ◽  
At Will

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

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