Abstract
Aiming at the requirements of real-time inspection in material industry, an ultrawide-field parallel SD-OCT system capable of visualizing cross-sectional image of internal structures by a single shot of a 2-D CMOS camera is developed. To achieve ultrawide-field parallel detection, one meniscus lens with negative dioptric is introduced as an additional relay lens and imaging optics including sample arm, relay lenses and spectrometer are optimized as a whole for desirable imaging quality. The developed system has an ultrawide-field of 35mm and an axial range of 8mm in air. The maximum on-axis sensitivity and the axial resolution are experimentally determined to be 65dB and 17.7μm, respectively. The on-axis lateral resolution is measured to be 44μm in parallel direction and 22μm in scanning direction. The system is applied to obtain 3-D volume images of a set of glass-samples covering an area of about 28mm by 15mm with thicknesses ranging between 2.1mm and 4mm, from which defects such as solid inclusion, micro-deformation and bubble are identified either on the surfaces or inside the samples.
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