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2 September 2008 The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology
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Abstract
The wavefront coding technology is known as a system-level technology which can extend the depth of focus of optical system by innovative optical design and image restoration. This technology can control misfocus related aberrations including misfocus, astigmatism, and Petzval curvature, temperature-related misfocus in digital imaging systems. It can also help optical system tolerate more residual error in optical manufacturing and alignment besides misfocus. The brief introduction of wavefront coding technology and the wavefront coded TMA system under research is presented respectively in part 1 and part 2. The "MTF similarity" is defined to describe the relationship among MTF at different position or different fields in the third part. It is also shown in this part that the MTF similarity of wavefront coded system is much higher than the normal system within a large range. In part 4 comparison between the origin system and the new system with wavefront coding technology is provided after multiple errors are introduced, from which it can be observed that the system with wavefront coding technology can tolerate much bigger error than origin system. The error tolerance is re-distributed according to a new criterion based on MTF similarity. If the MTF similarity is less than a certain value, it can be regarded that the system can tolerate the residual error. The new error tolerance is displayed and it is shown that the wavefront coding technology can also loosen the error distributing besides extended the depth of focus.
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Feng Yan and Xue-jun Zhang "The effect on tolerance distributing of an off-axis three mirror anastigmatic optical system with wavefront coding technology", Proc. SPIE 7068, Optical System Alignment and Tolerancing II, 706807 (2 September 2008); https://doi.org/10.1117/12.794018
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