旋光性質是某些介質的一種特性，此特性可應用在許多領域，如葡萄糖溶液濃度的量測。在本研究中，首先使用液晶可變相位延遲片與兩片四分之ㄧ波片組成一新型的液晶偏光調變器，此調變器可代替法拉第旋轉器，用來調變光偏振旋轉角度。本研究以一線性偏振光通過液晶偏光旋轉調變器與葡萄糖溶液，來得到一外差干涉訊號，將干涉訊號經解調變後即可求得葡萄糖溶液之濃度。此法的架構簡單，所需光學元件少，並使用液晶為調變材料，價格較使用電光晶體或法拉第調變器低廉，未來此系統可積體化達到輕量化與非侵入式量測血糖濃度之目的。

　　Optical activity which is a character of some substances can be applied to many domains, such as the measurement of glucose concentration. In this report, we firstly developed a new liquid-crystal (LC) polarization modulator consisting of one LC variable retarder and two quarter wave plates. This modulator could be used to replace the Faraday modulator in modulating the polarization angle of light. We passed a linearly polarizing light through the LC modulator and an analyzer to obtain a modulated signal. After demodulating the signal by using the new demodulation system, the rotation angle caused by optical activity would be derived. This polarimeter has simpler structure, less optical elements, and a cheaper modulator than traditional one. To be integrated and non-invasive glucose sensor will be the purpose of this system.

行政院衛生署, “中華民國台灣地區九十一年衛生統計重要指標” 民國92年1月

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