Experimental Investigation of Full Range High Speed FD-OCT Based on Orthogonally Polarized Light

• Main Authors: Ming-Shiuan Shiu, 許明軒
• Other Authors: 鄭旭志
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/3kymdz

碩士 === 國立虎尾科技大學 === 光電與材料科技研究所 === 99 === Now the technology is more advanced as well as Medical technology. The Medical technology is also more meticulous, fast and is an untouchable way for body. It has ultrasonic in the past and nowadays it uses optics to check body. Insert the light into body and it reflects the signal to demodulate. Due to the difference of medium, the light has different speed in different medium. So I will mainly research OCT(Optical Coherence Tomography) in the research paper. OCT is divided into TDOCT (Time-Domain OCT) and FDOCT (Frequency-Domain OCT). TDOCT is used auto stage and the signal it produced which Optical path difference is zero differ from Reference and each sample’s surface to judge the sample’s information. FDOCT just demodulate reflected light which is through the system and converse by computer to get the sample’s information. This research paper will be researched for FDOCT and strengthen its function. The research paper showed phase-shift algorithm of orthogonal polarization to improve the speed of frequency domain optical coherence tomography. Compared with time domain optical coherence tomography system, frequency domain optical coherence tomography system of orthogonal polarization algorithm is high speed, stable, disposable and simple to use and no movable stage has vibrational errors. We added a polarization film and a quarter of wave plate and whirl them to appropriate angle in the frequency domain optical coherence tomography. Through both lights’ phases of this experiment differed π/2[1] and separate them with in so that we could know the sample after we did. Due to Hermitian, inverse fourier transform would be half in the measured range normally. The research paper will show how to achieve full of measured range. In other words, the system will be one shot to measurement full-range of frequency optical coherence tomography.