Computer Modelling And Experimental Research of Led Optical Systems

Abstract

The paper considers the problem of design of modern light devices (LDs) based on LEDs and their optical systems (OSs). LEDs optical systems provide developers with opportunities to implement a variety of modern lighting tasks. In the market of competing products, it is often necessary to calculate and produce LED optics for specific lighting problems. The main one is the formation of a given distribution of illumination over the surface of the object. In comparison with existing lens and reflective OSs, individual projects with their own developed elements can give the desired result. The most popular services in LED lighting are the development of LED optics according to the customer’s specifications, lighting of the simulated product, development of 3D models for further production. The main stage in its development is the calculation and modelling of the OS. The results of this process are largely determined by the complex of lighting, thermal and functional characteristics of LDs. The development of modern LED LDs is inextricably linked with the use of specialized software. The article describes a mathematical model of the geometry of an OS that allows researcher to specify its shape for further design and provides a fast and accurate lighting calculation. To model objects, triangulation grids are often used, which makes it possible to fine tune their shape. To simplify the process of forming smoothed 3D surfaces, an edge was introduced as an auxiliary element of a triangulation grid. It makes it possible to simplify the process of approximating smooth surfaces without increasing the density of this grid. The developed software allows you to build optical surface models, perform ray tracing and calculate photometric body (PB). The article describes the simulation of LED OSs by the example of secondary LED optics. Computer simulation and prototyping of LED modules (LEDMs) for road lighting was carried out. 3D-models, a PB and curves of luminous intensity of LEDMs are received. The thermal imager an experimental study of the luminous and thermal characteristics of these modules was carried out. The results of the experiment showed very good agreement with the calculated models.