The purpose of this study was look for the optimized design of light source array applied in indoor lighting combined with visible light communication. The design of different light source arrays: circle, radiation, and rectangle were simulated and experimental for lighting, and then actually be used in visible light communication. The simulation results showed the rectangle array has the largest illumination flux than other arrays. And its total flux was 2662.3 lm; maximum illumination was 338 lx, and the effective illumination area of above 200 lx with a cover area of 2090 mm2. The measurement results also exhibited the rectangle array has the largest illumination flux than other arrays. Its total luminous flux is 2538.95 lm, and the effective illumination area of above 200 lx with a cover area of 2078 mm2. The measurement and simulation results have the same trend and the curve similarity was more than 99% by normalized cross correlation. Finally, combined with the signal transfer analysis of visible light communication, a measurement system was built with the input signal frequency of 1k Hz and the transmission distance of 1.8m. The receive waveform of rectangle array was best in the transport of free space to other arrays and the divergence angle could reaches to 85°.
Light-Emitting Diodes (LEDs) have the advantages of small length, long lifetime, fast response time (μs), low voltage, good mechanical properties and environmental protection. Furthermore, LEDs could replace the halogen lamps to avoid the mercury pollution and economize the use of energy. Therefore, the LEDs could instead of the traditional lamp in the future and became an important light source. The proposal of this study was to investigate the effects of the structure and length of the reflector component for a LED automotive lamp. The novel LED automotive lamp was assembled by several different modularization columnar. The optimized design of the different structure and the length to the reflector was simulated by software TracePro. The design result must met the vehicle regulation of United Nations Economic Commission for Europe (UNECE) such as ECE-R19 etc. The structure of the light pipe could be designed by two steps structure. Then constitute the proper structure and choose different power LED to meet the luminous intensity of the vehicle regulation. The simulation result shows the proper structure and length has the best total luminous flux and a high luminous efficiency for the system. Also, the stray light could meet the vehicle regulation of ECE R19. Finally, the experimental result of the selected structure and length of the light pipe could match the simulation result above 80%.
This study was to separate the semiconducting and the metallic types of single-wall carbon nanotubes (SWNTs) by
electrophoresis with the different dispersants that are deoxyribonucleic acid (DNA), Triton X-100 and sodium dodecyl
sulfate (SDS), respectively. The dispersants modify the surface of SWNTs and disperse in the de-ionized water. and used
electric power supply 100V to electrophoresis. However, the different dispersants such as DNA, Triton X-100 and SDS
coated on SWNTs have different property of electronic field. Hence, in the same power of electrophoresis was applied to
separate out s-SWNT and m-SWNT from the raw-SWNT. In addition, the DNA base pair and quantitative can be determine
by electrophoresis with standard mark. The electrophoresis has features that low sample need, low energy required and
efficiently for this fabrication. The results of Raman spectrum could verify the separation efficiency and determine the
electrical of the samples with the radial breathing mode (RBM, 100-400cm-1) of SWNT. After the dispersion process with
DNA, a new peak (~1450 cm-1) has been observed between D-band (~1350cm-1) and G-band (~1550cm-1) that also can
identify s-SWNT and m-SWNT.