The discussion uses aberration coefficients to determine primary aberrations and to find solutions that can later be optimized with real ray tracing. This chapter discusses some basic mirror systems. In a finite-conjugate system, the grooved side of the Fresnel lens should face the longer conjugate (Figures 3 - 4) because this produces the best performance. To provide a theoretical and conceptual overview of the LENS approach, especially in relation to the theory, concepts, and practices of traditional. Optical systems that use both mirrors and lenses are known as catadioptric. Directorate explores the theory and practice behind the use of systems. This aligns with the family systems theory, in that. Light CollimationĪ Fresnel lens can easily collimate a point source by placing it one focal length away from the source. Systems thinking is an approach to integration that is based on the belief that. The guiding principle is that what happens to one member of the family, happens to everyone in the family. ‘Theory’ might sound drily intellectual, but actually the systems perspective is a holistic way of reflecting on the world, which involves the whole of our being: in recent. Since then, Fresnel lenses have been utilized in a variety of applications, from light collimation and light collection to magnification. In the first in a series of articles on systems theory, Dr ROBERT BIEL argues that its application can be effective in healing the rift between society and nature. Sociotechnical systems theory integrates an understanding of group dynamics with an appreciation for the technical environment in which organizational work is. While French physicist Augustin-Jean Fresnel (1788 - 1827) was not the first to conceptualize a Fresnel lens, he was able to popularize it by integrating it into lighthouses. SYSTEMS THEORY AS A LENS 5 Introduction When I first began this project, I had two general goals: first, to learn more about my teaching context, and second, to apply systems theory as a lens on that context to see if it could help me achieve the first goal and thus prove the value of systems theory for regular people like us. ![]() Acrylic is the most common substrate due to its high transmittance in the visible and ultraviolet (UV) regions, but polycarbonate is the substrate of choice in harsh environments due to its resistance to impact and high temperature. They are manufactured from acrylic to polycarbonate to vinyl, depending on the desired wavelength of operation. Eventually, molten glass was poured into molds, but it was only with the development of optical-quality plastics and injection-molding technology in the 20 th-century that the use of Fresnel lenses in many industrial and commercial applications became practical.įresnel lenses can be manufactured from a variety of substrates. The first Fresnel lenses were made by tediously grinding and polishing glass by hand. Figure 2: Side Profile Comparison of a Plano-Convex (PCX) and a Fresnel Lens MANUFACTURING FRESNEL LENSES
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |