Various Dispersion Compensation Techniques for Optical System: A Survey

2014 ◽  
Vol 2014 (1) ◽  
pp. 64-73 ◽  
Author(s):  
N. K. Kahlon ◽  
◽  
G. G. Kaur ◽  
Keyword(s):  
Optical System ◽  
Dispersion Compensation ◽  
System A

scholarly journals Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 663
Author(s):  
Hui Zhang ◽  
Dengfei Liu ◽  
Yinwan Wei ◽  
Hong Wang
Keyword(s):  
Optical System ◽  
Design Method ◽  
Chromatic Dispersion ◽  
Electronic Devices ◽  
Color Temperature ◽  
Freeform Surface ◽  
United Nations Economic Commission ◽  
System A ◽  
Economic Commission ◽  
Key Points

We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.

Otoscopy and Photography

1979 ◽  
Vol 88 (6) ◽  
pp. 771-773 ◽  
Author(s):  
Benjamin Chen ◽  
Terry L. Fry ◽  
Newton D. Fischer
Keyword(s):  
Light Source ◽  
Clinical Application ◽  
Middle Ear ◽  
Optical System ◽  
Strobe Light ◽  
System A ◽  
The Subject ◽  
Ear Canals ◽  
Light Color ◽  
Otoscopic Examination

A new hand-held otoscope photographic system, convenient and suitable for clinical application, is introduced. This instrument allows clear otoscopic examination in stenotic or tortuous ear canals, and photographs the subject in one procedure. The instrument consists of a rodlens optical system, a fiberoptic light source, a camera, and exchangeable speculum and a strobe light. Color photographs of tympanic membranes and middle ear pathology are presented.

MODELING AND ANALYSIS OF COMMONPATH PHASE SHIFTING SHEAR SYSTEM BASED ON BIREFRINGENT OPTICAL DEVICES

2008 ◽  
Vol 17 (04) ◽  
pp. 503-510
Author(s):  
HONGJUN WANG ◽  
ZHAO WANG ◽  
AILING TIAN ◽  
BINGCAI LIU
Keyword(s):  
Optical System ◽  
Matrix Theory ◽  
Optical Devices ◽  
Phase Shifting ◽  
Surface Measurement ◽  
Jones Matrix ◽  
Optical Surface ◽  
Modeling And Analysis ◽  
System A ◽  
Shear System

In the technology of optical surface measurement, the phase-shifting shear interferometer had been widely used. In measurement, the phase-shifting was introduced in time domain, and the measurement system adopted double optical path for change phase-shifting and shear, so the measurement accuracy was limited. To decrease error, a commonpath phase-shifting shear system based on birefringent optical devices was introduced. In this system, the lateral shear and phase-shifting 0, π/2, π, 3π/2 was introduced in the commonpath optical system. Because the birefringent optical devices can introduce shear in the collinear optical system, a new Jones matrix was established. Based on the Jones matrix theory, the principle theory was analyzed in detail. In the experiment, an optical surface was measured with this system. The theoretical analysis and experiment results demonstrate the feasibility of this approach.

Overview of Gaia Multi-Color Photometry

2003 ◽  
Vol 12 (4) ◽  
Author(s):  
Erik Høg
Keyword(s):  
Optical System ◽  
Angular Resolution ◽  
Broad Band ◽  
Integration Time ◽  
High Angular Resolution ◽  
System A ◽  
Astrometric Observation ◽  
Medium Band ◽  
Effective Integration

AbstractGaia will obtain multi-color photometry for astrometric and astrophysical purposes. A photometry in five broad bands and with high angular resolution will be obtained after every astrometric observation of a star, especially for the sake of correcting slight astrometric chromaticity errors of the optical system. A separate smaller telescope will obtain photometry in eleven passbands of medium width designed to serve the astrophysical analysis of the mission results. The medium-band photometry (MBP) has less angular resolution, but much longer effective integration time than the broad-band photometry (BBP).

Reliability Model of Motorway Emergency Communication System

2013 ◽  
Vol 210 ◽  
pp. 122-129 ◽  
Author(s):  
Mirosław Siergiejczyk
Keyword(s):  
Optical System ◽  
System Architecture ◽  
Communication System ◽  
Functional Structure ◽  
Reliability Model ◽  
Emergency Communication ◽  
System A ◽  
Emergency Communications ◽  
Availability Index ◽  
Communications System

The paper presents some issues related to reliability model of a motorway telematics systems, in particular emergency communication system. Optical system architecture was presented and functions of the various subsystems, too. Analyzing the functional structure and method for transmitting information in a highway emergency communications system a method to calculate the reliability of the system was proposed. To assess the reliability of the emergency communication system, as a system repairable, availability index was also proposed.

scholarly journals Design of thermal imaging continuous-zoom optical system

2021 ◽  
Vol 2127 (1) ◽  
pp. 012070
Author(s):  
A V Kryukov ◽  
Yu Yu Kachurin ◽  
Yu S Datiy
Keyword(s):  
Optical System ◽  
Thermal Imaging ◽  
Imaging System ◽  
Focal Length ◽  
Optical Parameters ◽  
Secondary System ◽  
System A ◽  
Detection And Identification ◽  
Objective System ◽  
Analytical Expressions

Abstract The report tells about the design of a middle wave infrared continuous-zoom imaging optical system. To capture the image in an «eye-type» infrared optical system a multi-element sensor is used. To increase the contrast of the thermal image the sensor is equipped with a cold aperture. The use of an optical system based on the continuous-zoom lens makes it possible to solve the problems of object detection and identification more effectively but requires taking into account some features of varifocal lenses. The optical system being analyzed in the report includes front zoom objective system and secondary imaging system. The front zoom optical system is composed of four groups and provides the focal length that is continuously changed with a large zoom ratio (15–20X) under the condition of a constant total length of the system. The secondary imaging system is designed for zoom system exit stop and sensor cold stop conjugation. The design technique represents analytical expressions and equations to obtain optical parameters of the front and secondary system components and the motion curves for movable groups.

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