Stroboscopic wide-field optical coherence gated imaging

Woo June Choi; Jihoon Na; Jonghyun Eom; Byeong Ha Lee

doi:10.1117/12.808917

23 February 2009 Stroboscopic wide-field optical coherence gated imaging

Woo June Choi, Jihoon Na, Jonghyun Eom, Byeong Ha Lee

Proceedings Volume 7169, Advanced Biomedical and Clinical Diagnostic Systems VII; 71691L (2009) https://doi.org/10.1117/12.808917
Event: SPIE BiOS, 2009, San Jose, California, United States

Abstract

We present an advanced three-dimensional tomographic imaging system using the optical coherence gating based on stroboscopic illumination. The proposed system is based on a wide-field optical coherence tomography (WF-OCT) that is capable of en-face tomographic imaging through whole-field illumination and parallel detection technique. The scheme enables achievement of a three-dimensional volumetric image in real time only with a single axial continuous scanning. The axial scanning of the OCT system generates interferometric signal with a beat (or Doppler) frequency. The time-varying interfergams are usually detected in series with a CCD camera for the WF-OCT case. However, because the camera response is much slower than the Doppler frequency, the interference signal is averaged out for most cases. To avoid the averaging out problem of the beat signal, the input light is optically switched on and off at the same rate as the Doppler frequency generated by the axial scan. When the constructive interference components in the signal are synchronized with the stroboscopic illumination of the light source, the envelope signal of the sample can be detected by the slow camera. Compensated adaptive optic system was combined with the OCT instrument to avoid decrease of the interference signal by nonlinearity of scan motion. With the implemented WF-OCM, a lithium battery volume image of 6×4.5×0.005 (X×Y×Z) mm³ was obtained in 82 ms with axial scanning speed of 0.63 mm/s and visualized in volume rendering.

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Woo June Choi, Jihoon Na, Jonghyun Eom, and Byeong Ha Lee "Stroboscopic wide-field optical coherence gated imaging", Proc. SPIE 7169, Advanced Biomedical and Clinical Diagnostic Systems VII, 71691L (23 February 2009); https://doi.org/10.1117/12.808917

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KEYWORDS

Optical coherence tomography

Charge-coupled devices

Imaging systems

Signal detection

3D image processing

Interferometers

3D scanning

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