頁籤選單縮合
題 名 | Pressure-induced Effect on the Light Reflection of Cholesteric Liquid Crystals Using the Finite Element Method |
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作 者 | Chen, Jiun-yeu; Yeh, Jia-yi; | 書刊名 | 工程科技與教育學刊 |
卷 期 | 6:4 2009.12[民98.12] |
頁 次 | 頁375-387 |
分類號 | 448.5 |
關鍵詞 | Cholesteric liquid crystal; Finite element method; Pressure effect; |
語 文 | 英文(English) |
英文摘要 | Bragg reflections of cholesteric liquid crystals were investigated by the finite element method (FEM). The Galerkin FEM formulations and the absorbing boundary conditions are adopted. The number of chiral pitches required for establishing the Bragg reflection was calculated. Two models for the relationships between the applied pressure and the pitch of a cholesteric liquid crystal (CLC) were simulated: one is the linear model of the relative maximum reflection wavelength proportional to the reduced pressure, and the other is the model introduced by Pollamnn and Stegemeyer. In each case, the effect of pressure-induced changes in the peak of the reflection wavelength is demonstrated. The concept of pressure sensing performed on the CLCs is discussed and was simulated numerically. CLCs can be applied to measure for a required range of pressure. |
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