공통경로 OCT를 이용한 자기장 내에서 액체의 굴절률 변화 측정

초록

We present a measurement system of liquids refractive index based on a common-path spectral domain optical coherence tomography(OCT). Our measurement system is consisted of the circulator, broadband light source, spectrometer and sensor head. The sensor head is composed of metal mirror, fiber connector and small air gap between the mirror and the fiber end. The reflected spectrum is measured In air and liquids. In air measurement, the IFFT signal of measured spectrum gives only one peak near the mirror by the air gap. On the other hand, in liquid measurement, the mirror peak is shifted to the longer distance by the liquid refractive index. Therefore, we can calculate the refractive index of liquid using the shifted peak distance.