실린더형 압전소자 광지연선을 이용한 광 간섭형 단층촬영(OCT) 시스템 제작
Fabrication of an OCT System based on an Optical Delay Line with Cylindrical PZT
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초록
원통형의 압접소자를 이용한 광지연선을 사용하여 광 간섭형 단층촬영 시스템을 제작하였다. 광지연선은 18 m 길이의 단일 모드 광섬유를 압전소자의 둘레에 134회 감아 구성하였으며 0.78 mm의 광경로 길이변화를 얻었다. 제작한 광 간섭형 단층촬영 시스템은 신호 대 잡음비 96.9 ㏈, 종방향 분해능 18.6±0.5 ㎛, 횡방향 분해능 5 ㎛의 특성을 보였다.
Abstract
We demonstrate a compact optical coherence tomography(OCT) system based on the optical fiber delay line controlled by a cylindrical piezo-electric transducer(PZT). An 18-m length of single mode fiber is wrapped under constant tension around a PZT. Approximately 134 windings are used. Wraps of the long length of fiber allow the small expansion of the PZT to be magnified to an optical path length delay of 0.78 mm. The OCT system shows characteristics for 2-dimensional imaging, exhibiting 96.9㏈ of signal-to-noise ratio(SNR), 18.6±0.5 ㎛ of axial resolution, and 5 ㎛ of lateral resolution with samples.
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