가시광선과 원적외선 듀얼카메라의 영상 정합도 향상을 위한 동축광학계 설계 및 분석
Design and Analysis of Coaxial Optical System for Improvement of Image Fusion of Visible and Far-infrared Dual Cameras
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본 논문에서는 가시광선과 원적외선 전반의 파장대역에 걸쳐 사용 가능한 동축 듀얼카메라를 설계 및 분석하였다. 광학계는 빔 스플리터를 이용한 동축광학계 시스템으로 설계되었으며, 가시광선 광학계에서 적외선으로 인한 열 전달을 최소화하기 위해 hot mirror 타입의 빔 스플 리터를 사용하였다. 원적외선 카메라는 비냉각형 검출기로 640 × 480의 센서 배열을 가지고, 가시광선은 1,945 × 1,097의 센서를 사용한다. 최적화 과정을 거친 후 최종 설계된 광학계의 정합도는 90% 이상이며, 기존에 존재하던 듀얼카메라에 비해 정합도가 향상된 효율적인 설계 결과를 얻었고, 테스트를 통해 향상된 정합도를 확인하였다.
Abstract
In this paper, we designed a coaxial-dual camera incorporating two optical systems—one for the visible rays and the other for far-infrared ones — with the aim of capturing images in both wavelength ranges. The far-infrared system, which uses an uncooled detector has a sensor array of 640 × 480pixels. The visible ray system has 1,945 × 1,097 pixels. The coaxial-dual optical system was designed using a hot mirror beam splitter to minimizeheat transfer caused by infrared rays in the visible ray optical system. The optimization process revealed that the final version of the dual camerasystem reached more than 90% of the fusion performance between two separate images from dual systems. Multiple rigorous testing processesconfirmed that the coaxial-dual camera we designed demonstrates meaningful design efficiency and improved image conformity degree compared toexisting dual cameras.
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