MEMS Motor Based Common-Path Endoscopic Fourier Domain OCT

摘要

A rotational microelectromechanical(MEMS) motor based common-path Fourier-domain OCT for endoscopic imaging, which uses the interface between the index-match oil and distal-end surface of the fiber as a self-aligned reference mirror, is reported. The reference intensity is easy to be tuned by altering the index of the match oil to optimize the signal to noise ratio of the system. An external Michelson interferometer is used to compensate for the optical path difference and dispersion mismatch to the index-match oil and the GRIN lens. Due to this common-path design, the OCT signal is immune to bending or stretching of the endoscopic catheter. The outer diameter of the probe is 3 mm, and 22 circumferential-scans and 50,000 lines A-scans are obtained in one second.