Microprism plane-focusing fresnel optics for systems of automatic control for moving objects
DOI:
https://doi.org/10.34169/2414-0651.2024.1(41).111-121Keywords:
microprismatic Fresnel structure, plane-focusing optics, lenses parameters simulation, diamond microcuttingAbstract
An algorithm for simulating Fresnel microprism plane-focusing lenses has been developed, which form a homogeneous image of transmitted light rays in the lens focal plane. Such transforming lenses make it possible to form an optimal signal in systems of automatic control of moving objects with four-plane photodetectors, and are also promising for usage in solar photovoltaic modules.
Test samples of such specified focusing microprism devices with illumination distribution of the light spot in the form of circle and ring were made by the method of diamond microcutting technique according to our simulation results. A feature of focusing structures created by the diamond cutting technique is a discrete change in the refractive angles of microprismatic zones, resulting in the discreteness of the images formed in the focus. This is a main difference from Fresnel focusing optics with aspherical convex circular surfaces, when the angles of refraction change continuously. In the manufacture of such new devices by the diamond cutting method it is possible to obtain almost mirror working surfaces of a high optical quality. However, the size of such conical refracting zones should not be too large to reduce the discreteness of the formed images, so the new specified focusing microprisms are made from several totally identical prismatic elements.
Some samples of specialized transforming microprism structures were experimentally investigated with the collimated «green» laser beam. These lenses were made based on our simulation results and form in the focus the uniform illumination of a light spot in the form of a light circle and a circle with a ring.
The appropriate technology of diamond microcutting was created and metal matrices for mass replication of flat focusing optics from optical plastic materials were produced. Samples of specialized transforming microprism structures, which were manufactured by the method of thermo-pressing using created metal matrices, were studied.
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Copyright (c) 2024 Вячеслав Петров,Євген Антонов,Володимир Зенін,Андрій Крючин,Семен Шанойло
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