In designing a high performance IR re-imaging optical system for thermal imaging handheld applications, one of the most changeling tasks is to achieve very compact and light weight optical configuration, and at the same, be able to incorporate a number of associated optical devices, such as micro-scanner mirrors, non uniformity correction device, dual FOV optical elements, focussing lens etc.., within the optical path. This paper describes the First Order Optics calculation for such optical configuration, which allows optics engineer to define a suitable optical layout before performing optical optimisation and analysis. A design example of a 3-5um FPA re-imaging optics system is presented.
A miniature split-optics camera attachment with high index glass was developed for an optical sighting system. The system is designed to clip-on to an exiting eyepiece to monitor and record the sighting activities by the operator. This paper describes an optics design which makes use of very high index glass to prolong the eye-relief of the exiting eyepiece and allow the operator to operate the sighting system with his spectacles.
Conventional IR optical systems with high magnification and switchable FOBs suffer form strong unwanted Narcissus effect. This is mainly caused by retro-reflections from the objective lens back to the detector plane. In this project, a new dual aperture optical configuration has been developed to reduce substantially the Narcissus effect while maintaining good optical performance. A design example is presented in this paper. The relative Narcissus Induced Temperature is reduced from about 1.4 degree C to about 0.1 degree C, thus enhancing the detection range of the IR system.
The interface between optical design and fine-mechanical design is a creatively fertile stage in the design of an optical system. The optical designer learns `What the system is all about' and the fine-mechanical engineer is liberated creatively by finding out what the priorities are. On the other hand, optical tolerancing as a discipline, which is an attractive mix of optical physics at one end and hard-nosed mechanical pragmatism at the other, has a relatively fragmented literature. It is the purpose of this paper to (1) Point out some cultural contrasts between optical engineers, mechanical engineers and physicists in this context, (2) To present a new method of displaying the optical surface sensitivities so that one may identify datum surfaces in an intuitive way and (3) To summarize some useful formulae which provide a key to the mounting of optical components. Together these three aspects illustrate the scenery of this fertile terrain.
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