本研究係發展一光電訊號處理技術並應用在奈米測距系統中,即以齊曼雷射(Zeeman Laser)為光源,輔以麥克森線性量測干涉組,其差頻為2.6MHz的感測光與經由壓電材料控制之奈米位移感測光耦合,經由光檢測器得干涉訊號,再經相位解調之訊號處理技術檢出奈米位移量,其位移變化量之解析度可達0.88 nm/1°。 研究中亦建置一表面電漿共振量測系統 並將此訊號處理技術應用在葡萄糖濃度量測,濃度解析度可達0.935 mg/ml 。 本論文主要貢獻為利用自行發展之電路相位解調系統,將待測之奈米距離或濃度變化,從2.6MHz的載波訊號解調出光學干涉項之相位差,並轉成電壓訊號,再應用AD轉換成數位訊號,最後由單晶片處理器得知。
The objective of 1.This research is develops an electro-optical signal processing techniques for the nano-scale displacement measuring system and concentration measurement based on heterodyne interferometer. 2.This system uses a 1mW Zeeman laser as the light source, where it has a carried frequency 2.6MHz impressed upon it. 3.The system resolution is also greatly improved by utilizing the Digital interpolation method, and accuracy up to 0.88 nm/1° or 0.935 mg/ml has been obtained.