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Tham khảo tài liệu 'nonimaging optics winston episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 8.8 Three-Dimensional Ray Tracing of Some RX Concentrators 199 Figure 8.19 RX concentrator 2 3 and 4. The input and output bundles are the same as in Figure 8.18. Other data of these concentrators are shown in Table 8.3. Figure 8.20 RX concentrator 5. The points S and S of the input bundle of this concentrator are at infinity. The points s and S of the input bundle of the concentrator 5 shown in Figure 8.20 are at infinity. This concentrator is not a typical case of one designed for a source at infinity because the points A and A are not coincident with D and D . Table 8.3 shows some geometrical characteristics and the 3D ray-tracing results of the RX concentrators 1 to 4. The second row in this table shows the values Tt when the shadow of a surface placed at the receiver is taken into account. Observe that this surface intercepts some rays in their trajectories from the refractive surface to the reflective surface. The third row shows the values of Tt when the reflection losses at the mirror reflection coefficient 0.91 and the Fresnel losses at the dielectric interface refractive index n 1.483 are also considered. Figure 8.21 shows the transmission function of the RX 3 Figure 8.19 . This is a function of pS SS and PA AA pS is the distance from a point of the circle SS to the symmetry axis and pA is the same for a point of the circle AA . The transmission function gives the percent power reaching the receiver relative to the power emitted from the ring pS pS dpS of the circle SS toward the ring pA pA dpA of the circle AA . The radiance of all the rays is assumed to be identical for this calculation. If the 3D concentrator were ideal then the transmission function would be 1 if pS SS 1 and pA AA 1 and it would be zero elsewhere. The 200 Chapter 8 Simultaneous Multiple Surface Design Method Table 8.3. Geometrical Characteristics and 3D Ray-Tracing Results of Selected RX Concentrators. Concentrator Number Concentrator Characteristics 1 2 3 4 Total transmission Tt 99.4