在光學量測技術中，往往需要調變的機構將系統中的微小變量利用載波的技術，把訊號從系統中取出，再利用解調變的技術求得待測訊號。拍頻調變技術是利用運動中的光柵，聚合兩道具有頻差的繞射光，藉此產生拍頻訊號，以達到調變訊號的目的。
本論文提出一種創新的設計，利用微機電製程技術與液晶元件製程技術將傳遞式電場與液晶光柵做結合，因電場的傳遞導致液晶分子的轉動，使液晶光柵中的有效折射率同樣也有傳遞的效果，藉此模擬光柵的運動。先前的拍頻訊號處理系統中，因所得的訊號為『類拍頻訊號』，且PZT本身因熱飄移的現象，會造成量測訊號的不穩定，本研究中提出新的概念，期望能改善先前系統中的相關問題。
本論文分為實作與模擬兩部分，實作部份利用微機電製程技術，完成IPS液晶光柵的製作，可達到分光的效果。在理論模擬方面，利用LCD Master分析軟體，分析傳遞式電場在液晶光柵中所造成的效應，除了探討有效折射率傳遞的現象外，也由液晶光柵內Phase shift distribution的分佈，計算出光通過光柵的繞射強度。而在研究中發現，Phase shift distribution在傳遞過程中因波形的改變，導致繞射光的強度也隨著變動，而在後續的光學系統中，會有強度調變的現象發生，論文中並提出數種改善方法。
最後利用LiNbO3的光電晶體，分析傳遞式電場造成折射率傳遞的現象，以改善液晶操作頻率過低的缺點。

In this study, we propose a new design which combines the traveling electric field with the in-plane switch liquid crystal phase grating. The traveling of the electric field will lead to the rotation of the liquid crystal molecules, and the effective refractive index in the in-plane switching liquid crystal grating also has the traveling effect. The traveling of the effective refractive index can simulate the movement of the phase grating and it can improve several problems in the optical measuring system. In the previous optical measuring system, we use the PZT stage to drive the phase grating, but the PZT stage has the 『thermal drift』 problem and that will lead to the unstable of the measured signals.
In our experiment, we use the Micro-Electro-Mechanical fabrication techniques to fabricate the IPS liquid crystal grating and this device can diffractive the incident light. In the analysis part, we use the Lcd Master to simulate the motion of the liquid crystal molecules in the IPS liquid crystal grating. The Lcd Master can also simulate the effect of the traveling electric field in the IPS liquid crystal grating. Finally, we analysis the traveling electric field in LiNbO3 and it can improve the drawback that the frequency response is too slow in liquid crystal.

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