The study of small refractive index changes by self-assembled optical coherence tomography

• Main Authors: Yu-Cyuan Ciou, 邱昱銓
• Other Authors: Sheng-Fen Cho
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/10440137895728345900

碩士 === 清雲科技大學 === 電子工程所 === 101 === The study focused on the application of a self-assembled optical coherence tomography (OCT). OCT’s system setup was improved from the Michelson interferometer. The major difference between Michelson interferometer and OCT is that OCT uses lower coherence light source to achieve the non-invasive imaging on samples. The following three types of experiments were completed using self-assembled optical coherence tomography system, including the measurement of glass medium’s thickness under different rotation angle, the relationship between air density and refractive index, and the association between liquid crystal and refractive index using electro-optic modulator. Firstly in the solid medium measurement experiment, the distance changes from incidence angle of 0 degrees to 30 degrees were within 0.1um-120 um. The results of the thickness measurement were agreed, within 2.5% error, with the calculation value in the incidence angle of 5 degrees to 10 degrees. In the second experiment, our results showed the correlation between air density and refractive index. In the final experiment, because of the tiny difference of refractive index, the optical path difference could not be directly measured. However, after signal analysis, a positive correlation was verified in this study.