Optical Design and Stray Light Concepts and Principles
To insure that an optical system performs to specifications, the optical engineer needs to fully consider several aspects of the design process. Each of these tasks can be aided with the use of software tools. The optical engineer needs to understand the
- PDF / 732,765 Bytes
- 19 Pages / 547.146 x 686 pts Page_size
- 3 Downloads / 182 Views
To insure that an optical system performs to specifications, the optical engineer needs to fully consider several aspects of the design process. Each of these tasks can be aided with the use of software tools. The optical engineer needs to understand the strengths and limitations of the available software tools and how to best apply these programs to each design. There are several distinct steps in the implementation of an optical system: the first order optical layout, optimized design of the optical system, performing stray, scattered and ghost analysis, performing a tolerance analysis of the optical system and performing manufacturing analysis. Although each of these steps are often considered separately, and often require the use of several different software tools, it is imperative for the engineer to consider the entire process during each phase of system development so that issues arising from stray light or manufacturing tolerances
The design of an optical system is comprised of several distinct but interrelated steps. The initial phase in the optical design process is the design of the optical system. That is, establishing a set of optical parameters for each necessary optical component so that the design’s performance level exceeds the design specifications. Another phase of the design process is to perform a tolerance analysis to verify that the system will still perform to specification when the limitations of material properties, manufacturing and assembly are considered. Another important phase is a separate analysis to con-
7.1
The Design Process ............................... 399
7.2
Design Parameters................................ 402
7.3
Stray Light Design Analysis .................... 410
7.4
The Basic Equation of Radiation Transfer 7.4.1 Stray Radiation Paths ................... 7.4.2 Start from the Detector ................. 7.4.3 The Reverse Ray Trace ................... 7.4.4 Field Stops and Lyot Stops .............
7.5
Conclusion ........................................... 416
412 413 413 414 415
References .................................................. 416 do not force a redesign of the system. A thorough understanding of the optical design and analysis process as well as the proper use of available optical software tools are necessary to insure the optimum optical design for each specific application.
sider the effects of stray light due to ghost reflections, scatter, and the design of proper baffling. The optical designer is aided in each of these steps with computer programs specifically written for these tasks. The design and tolerancing of an optical system is generally performed using software referred to as sequential optical design programs or lens design codes. Stray light analysis is performed using a non-sequential, or unconstrained, optical analysis program. We will consider the capabilities and requirements of each of those optical programs.
7.1 The Design Process The process of designing an optical system consists of establishing a set of optical component
Data Loading...
