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Boundary Burr Phenomenon for Long-path Time Domain OCT

Long-path OCT measurement system has been developed for industrial use. We aim to measure time change of the concentration and refractive index of the target solution with a certain volume. As the fundamental experiment, we put the glass plate in the solution to obtain the glass position and its thickness, and got the interesting result. That is, the vibration mitigating waveform like a diffraction pattern by a knife-edge was observed. The OCT measurement consists of inline signals from the back-reflected (scattered) light, the diffraction pattern by a knife-edge is appeared on a screen. Although this phenomenon causes the boundary burr on the target detection, while the diffraction pattern has the information of the refractive index difference of the target. In this study, the characteristics of the boundary burr phenomenon is examined. Its origin is considered experimentally and analytically.