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http://dx.doi.org/10.3807/KJOP.2021.32.6.286

Optical Design of a Modified Catadioptric Omnidirectional Optical System for a Capsule Endoscope to Image Simultaneously Front and Side Views on a RGB/NIR CMOS Sensor

Hong, Young-Gee (Department of Photonics and Sensors, Graduate School, Hannam University)
Jo, Jae Heung (Department of Photonics and Sensors, Graduate School, Hannam University)

Publication Information

Korean Journal of Optics and Photonics / v.32, no.6, 2021 , pp. 286-295 More about this Journal

Abstract

A modified catadioptric omnidirectional optical system (MCOOS) using an RGB/NIR CMOS sensor is optically designed for a capsule endoscope with the front field of view (FOV) in visible light (RGB) and side FOV in visible and near-infrared (NIR) light. The front image is captured by the front imaging lens system of the MCOOS, which consists of an additional three lenses arranged behind the secondary mirror of the catadioptric omnidirectional optical system (COOS) and the imaging lens system of the COOS. The side image is properly formed by the COOS. The Nyquist frequencies of the sensor in the RGB and NIR spectra are 90 lp/mm and 180 lp/mm, respectively. The overall length of 12 mm, F-number of 3.5, and two half-angles of front and side half FOV of 70° and 50°-120° of the MCOOS are determined by the design specifications. As a result, a spatial frequency of 154 lp/mm at a modulation transfer function (MTF) of 0.3, a depth of focus (DOF) of -0.051-+0.052 mm, and a cumulative probability of tolerance (CPT) of 99% are obtained from the COOS. Also, the spatial frequency at MTF of 170 lp/mm, DOF of -0.035-0.051 mm, and CPT of 99.9% are attained from the front-imaging lens system of the optimized MCOOS.

Keywords

Capsule endoscope; Catadioptric omnidirectional optical system; Lens design; Medical optics; Omnidirectional optical system;

Citations & Related Records

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