Performance of micro optofluidic beam splitter enhanced by modifying inlet geometry and adjusting inlet flow rates
| Autor: | Yu-ChingChiang, 江昱慶 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 In this work, we proposed a micro optofluidic beam splitter with three-dimensional (3D) inlets and gently varying curved side walls of main channel. Calcium chloride solution (A fluid) and deionized water (B fluid) are applied as the core and cladding fluids, respectively. Two deionized water inlets lie on both sides of the calcium chloride solution inlet. The latter is shallower than the former in depth. By the diffusion between the A fluid and B fluid, the gradient refractive index (GRIN) is formed. The beam passing through the main channel will be split into two beams on both sides of the main channel and converged toward the central horizontal plane by the GRIN. Furthermore, we can adjust the inlet flow rate to change the GRIN, and so change the split angle. ANSYS Fluent and self-developed codes are used to simulate the flow field and the light trajectory under different geometry and flow rate parameters. Taguchi method is used to optimize the parameters to enhance the performance. The validity of simulations is confirmed by the experiment. And we can find the following trends from the results. (i) The 3D structure of the splitter improves the transmission. (ii) The ratio of the flow rates at the two B inlets can be used to adjust the split angle. (iii) The ratio of the A fluid flow rate and the total flow rate can be used to change the location where the light begins to converge. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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