Optical design of three-dimensional digital ophthalmoscopes

2016 ◽  
Author(s):  
Yi-Chin Fang ◽  
Chih-Ta Yen ◽  
Chin-Hsien Chu
Keyword(s):  
Optical Design ◽  
Three Dimensional

Optical Design of Three-Dimensional Projection on Multifocal Planes

2018 ◽  
Vol 38 (9) ◽  
pp. 0922002
Author(s):  
陈寰 Chen Huan ◽  
乔杨 Qiao Yang ◽  
徐熙平 Xu Xiping ◽  
陈贺 Chen He ◽  
周晶 Zhou Jing
Keyword(s):  
Optical Design ◽  
Three Dimensional

High Efficiency LED Module with 3D Bending Machine

2012 ◽  
Vol 579 ◽  
pp. 10-21 ◽  
Author(s):  
Chung Yi Lin ◽  
Tung Cheng Pan ◽  
Yao Chi Peng ◽  
Jian Shian Lin ◽  
Cheng Hao Ko ◽  
...  
Keyword(s):  
Automatic Control ◽  
Intensity Distribution ◽  
High Efficiency ◽  
Light Emission ◽  
Optical Design ◽  
Three Dimensional ◽  
Control Program ◽  
High Accuracy ◽  
Luminous Intensity ◽  
Bending Angles

Abstract- In this paper, a bending machine for tuning optical design of LED module is proposed. The tuning is done by changing the bending angles of each package on a given module with the help of automatic control program. Luminous intensity distribution can be controlled by adjusting the light emission path, which in turn can be implemented as changing the bending angles of individual LED packages on the module. The proposed machine is capable of bending packages to specified angles with errors less than 0.1°. Three-dimensional light distribution for bent package LED modules is also studied based on various application scenarios so that each scenario can have diversified luminous intensity distribution resulting in higher uniformity and better luminance quality. The machine has several advantages, including quick bending, high accuracy, and great customizability. These advantages make the machine meet the requirements of automatic mold forming.

scholarly journals Printing special surface components for THz 2D and 3D imaging

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Bo Yan ◽  
Zhigang Wang ◽  
Xing Zhao ◽  
Lie Lin ◽  
Xiaolei Wang ◽  
...  
Keyword(s):  
Imaging System ◽  
Incident Light ◽  
Optical Design ◽  
Bessel Beam ◽  
Three Dimensional ◽  
Focal Depth ◽  
Traditional System ◽  
Special Surface ◽  
3D Printed ◽  
Aspherical Mirrors

AbstractThe paper reports an off-axis large focal depth THz imaging system which consists of three 3D printed special surface components (two aspherical mirrors and an axicon). Firstly, the optical design software is used to design and optimize the aspherical parabolic mirror. Secondly, the optimized mirror is prepared by a 3D printing and metal cladding method. Thirdly, a THz axicon is designed for generation of quasi-Bessel Beam and a new geometric theoretical model of oblique incident light for axicon is established. Finally, the imaging system based on the special surface components is constructed. Its maximum diffraction-free distance is about 60 mm, which is 6 times higher than the traditional system. To verify the effectiveness, THz two-dimensional imaging experiments and three-dimensional computed tomography experiment are carried out. The results are consistent with the design and calculations.

Research on the Splitting Measurement Method of Space Position in Three-Dimensional Field

2010 ◽  
Vol 139-141 ◽  
pp. 2015-2018
Author(s):  
De Xi Wang ◽  
Qin Li ◽  
Fu Bao Li ◽  
Zong Ke Li
Keyword(s):  
Measurement Method ◽  
Optical Design ◽  
Three Dimensional ◽  
Ccd Camera ◽  
Spatial Location ◽  
Object Point ◽  
Position Measurement ◽  
Spatial Coordinates ◽  
Flat Mirror ◽  
Point Of Intersection

A research on measurement method of space position in three-dimensional field was demonstrated in this paper. According to the basic methods and principles of three-dimensional spatial position measurement, optical path of splitting design was used to divide an object point, through the red and green filters, into two beams of red and green, and then, through flat mirror, rectangular prism, cube prism and other optical design, it imaged on the same CCD camera film. Standard mesh was used to determine the relationship between two different spatial coordinates and the spatial pixel coordinates in the measurement space, and then the calibration relationship between object point coordinates and pixel coordinates were determined. This calibration relationship clear the error caused by the method of measurement and the measurement system. Through the determination algorithm of spatial location in three-dimensional field, the two corresponding lines of space was obtained, and its point of intersection is the spatial coordinate.

Chemical Imaging with Variable Angles of Incidence Using a Diamond Attenuated Total Reflection Accessory

2008 ◽  
Vol 62 (10) ◽  
pp. 1102-1107 ◽  
Author(s):  
K. L. Andrew Chan ◽  
Feng H. Tay ◽  
Graham Poulter ◽  
Sergei G. Kazarian
Keyword(s):  
Optical Design ◽  
Three Dimensional ◽  
Numerical Aperture ◽  
Chemical Imaging ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Angle Of Incidence ◽  
Two Samples ◽  
Subsurface Layers ◽  
3D Information

A new development in Fourier transform infrared (FT-IR) imaging using a diamond attenuated total reflection (ATR) imaging accessory in a novel manner that allows the angle of incidence to be varied in order to obtain images from subsurface layers of different thickness is introduced. Chemical images of samples from the same area but with different depths of penetration are obtained by changing the angle of incidence as well as using different spectral bands at different wavenumbers. Changes in the angle of incidence with this accessory were made possible by taking advantage of the relatively large numerical aperture employed by the original imaging optics. This arrangement allowed us to introduce an additional movable aperture in the optical design to restrict the angle of incidence to certain values. Two samples have been studied, one for the calibration of the angle of incidence while the other demonstrates the capability of obtaining three-dimensional (3D) information using this approach. Advantages of this new approach include the relatively high spatial resolution (it can spatially resolve features as small as 12 μm without a microscope) and no change in the imaging area and sampling area during manipulation of the angle of incidence.

scholarly journals Aberration analysis of AOTF-based stereoscopic spectral imager using optical design software

2021 ◽  
Vol 2127 (1) ◽  
pp. 012035
Author(s):  
VI Batshev ◽  
A V Gorevoy ◽  
V E Pozhar ◽  
A S Machikhin
Keyword(s):  
Ray Tracing ◽  
Narrow Band ◽  
Optical Design ◽  
Three Dimensional ◽  
Imaging Systems ◽  
Optical Aberrations ◽  
Program Module ◽  
Polarized Beams ◽  
Design Software ◽  
Spectral Imager

Abstract Stereoscopic spectral imagers using acousto-optic tunable filters (AOTF) provide high-resolution narrow band images acquired from two viewpoints with different polarization in arbitrary spectral intervals, which allows obtaining three-dimensional hyperspectral models of inspected objects for many applications. We discuss modeling of acousto-optic (AO) cell for optical system design and introduce a program module for ray tracing through AO cell compatible with Zemax optical design software. A detailed study of the optical aberrations that limit the image quality in two AOTF-based stereoscopic systems implementing simultaneous AO diffraction of two differently polarized beams in single AO cell is presented. This approach may be used to design various AOTF-based imaging systems, but the limitations of ray tracing analysis should be considered.

scholarly journals The Lightfield Microscope Eyepiece

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6619
Author(s):  
Nicolò Incardona ◽  
Ángel Tolosa ◽  
Gabriele Scrofani ◽  
Manuel Martinez-Corral ◽  
Genaro Saavedra
Keyword(s):  
3D Reconstruction ◽  
Time Resolution ◽  
Optical Design ◽  
Three Dimensional ◽  
Fourier Integral ◽  
Single Shot ◽  
Proof Of Concept ◽  
Novel Device ◽  
Translation Stage ◽  
Commercial Device

Lightfield microscopy has raised growing interest in the last few years. Its ability to get three-dimensional information about the sample in a single shot makes it suitable for many applications in which time resolution is fundamental. In this paper we present a novel device, which is capable of converting any conventional microscope into a lightfield microscope. Based on the Fourier integral microscope concept, we designed the lightfield microscope eyepiece. This is coupled to the eyepiece port, to let the user exploit all the host microscope’s components (objective turret, illumination systems, translation stage, etc.) and get a 3D reconstruction of the sample. After the optical design, a proof-of-concept device was built with off-the-shelf optomechanical components. Here, its optical performances are demonstrated, which show good matching with the theoretical ones. Then, the pictures of different samples taken with the lightfield eyepiece are shown, along with the corresponding reconstructions. We demonstrated the functioning of the lightfield eyepiece and lay the foundation for the development of a commercial device that works with any microscope.

Multi-Angle Bending Machine for Creating High Luminance Efficiency LED Module with Diversified Light Distribution Curve

2012 ◽  
Vol 6 (3) ◽  
pp. 354-362
Author(s):  
Chung-Yi Lin ◽  
◽  
Tung-Cheng Pan ◽  
Yao-Chi Peng ◽  
Cheng-Hao Ko ◽  
...  
Keyword(s):  
Distribution Curve ◽  
Light Emission ◽  
Optical Design ◽  
Three Dimensional ◽  
Control Program ◽  
High Accuracy ◽  
Light Distribution ◽  
Luminous Intensity ◽  
High Luminance ◽  
Luminance Efficiency

In this paper, a bending machine for tuning the optical design of an LED module is proposed. The tuning is done by changing, with the help of an automatic control program, the angle at which each package on a given module is bent. The distribution of luminous intensity can be controlled by adjusting the light emission path, which in turn can be implemented by changing the angles of individual LED packages on the module. The proposed machine is capable of bending packages to specified angles with less than 0.1° of error. Three-dimensional light distribution for bent package LED modules is also studied, based on various application scenarios, so that each scenario can have a diversified luminous intensity distribution, resulting in higher uniformity and better quality luminance. The machine has several advantages, including quick bending, high accuracy, and great customizability. With these advantages, the machine meets the requirements of automatic mold forming.

Micro-optical design of a three-dimensional microlens scanner for vertically integrated micro-opto-electro-mechanical systems

2015 ◽  
Vol 54 (22) ◽  
pp. 6924 ◽  
Author(s):  
Maciej Baranski ◽  
Sylwester Bargiel ◽  
Nicolas Passilly ◽  
Christophe Gorecki ◽  
Chenping Jia ◽  
...  
Keyword(s):  
Optical Design ◽  
Three Dimensional ◽  
Mechanical Systems
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