![]() ![]() Initially, only Zemax was used to evaluate the objective. To quantify the differences between both approaches, it is used an objective working between -40Â☌ and 110Â☌. The research questions targeted in this paper are: what are the differences in the formulation of materials' thermal expansion between Zemax and Ansys what is the impact on optical quality between both approaches quantification of the differences between the two methodologies in terms of back focal length, spot radius and modulation transfer function (MTF). The goal of this paper is to study in which extent the use of Zemax is suited for athermalization purposes. It pointed out that the position relationship between the objective lens and the microlens array had a great affect on imaging, which was the guidance when developing a prototype.Ĭomparison of lenses' thermal expansion formulation in Zemax versus ANSYS with SigFit post processingįaria, João. Then all the parameters were optimized using ZEMAX and the simulation image was given out. Zhou, Ke Xiao, Xiangguo Luan, Yadong Zhou, Xiaobinīased on the principium of light field imaging, there designed a objective lens and a microlens array for gathering the light field feature, the homologous ZEMAX models was also be built. Although developed for the purpose of specific case of fundus camera, the method might be utilised in a wider range of applications where ghost control is critical.Simulation design of light field imaging based on ZEMAX ![]() What is proposed in the paper, is a complete method to incorporate ghost reflected energy into the raytracing system merit function for sequential mode which is more efficient in optimisation process. There are also available standard ghost control merit function operands in the sequential ray-trace, for example in Zemax system, but these don't allow back ray-trace in an alternative optical path, illumination vs. It is good enough for system check but not very suitable for early optimisation process in the optical system design phase. This approach can be applied in both sequential and nonsequential ray tracing. Typically back reflections analysis, comprise treating subsequent objective surfaces as mirrors, and reflections from the objective surfaces are traced back through the imaging path. As more surfaces are required, more sophisticated method is needed to get rid of back reflections. In the paper an alternative approach, an objective with all spherical surfaces, is presented. Typically a single aspheric objective is used. ![]() As there is very little light reflected from the retina, even excellent antireflective coatings are not sufficient suppression of ghost reflections, therefore the number of surfaces in the common optics in illuminating and imaging paths shall be minimised. Eliminating back reflections is critical in the design of a fundus camera with internal illuminating system. ![]()
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