PSI - Issue 17

Pedro J. Sousa et al. / Procedia Structural Integrity 17 (2019) 828–834 Sousa et. al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 4. Ray trace of the LED and a parabolic mirror (only a small sample of the total simulated rays are shown)

The analyzed data included focus distances from 5 mm to 20 mm in steps of 1 mm, diameters from 140 mm to 200 mm in steps of 10 mm, and offsets from -10 mm to +10 mm in steps of 2.5 mm. In the vicinity of the target results, the larger steps were refined to provide better results. The obtained data was exported to MATLAB for analysis. The chosen parameters were 9 mm focus, 165 mm diameter and zero offset. With these parameters, it is possible to obtain a high illuminance region of approximately 250 mm at one meter, the red region in Fig. 5.

Fig. 5. Irradiance [W/mm 2 ] results for a plane one meter in front of the LED, with a parabolic mirror with 9 mm focus and 165 mm diameter

4. Mechanical Design

Having chosen the physical parameters of the reflector, it was then necessary to design the mechanical system. The 3D model of the reflector was generated in the optical design software and then exported to CAD software for integration. During the design of this system, there were concerns regarding weight, weight distribution, cooling, manufacturability and versatility. The final version of the developed system is shown in Fig. 6.