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회절광학을 이용한 적외선 광학계 설계 및 BSP를 이용한 성능 평가, 분석
공현배,조두진,Kong, Hyun Bae,Cho, Doo Jin 한국광학회 2013 한국광학회지 Vol.24 No.4
본 논문에서는 두 매의 BD-2 렌즈와 비구면 회절 광학을 포함하는 F/1.2, 시야각 $15.2^{\circ}$와 $8-14{\mu}m$의 원적외선 파장대역을 가지는 광학계를 설계하였다. 이 광학계는 uncooled camera에 사용될 수 있으며, 광학계의 분석은 BSP로 진행되었다. 회절광학은 주어진 두께를 가지는 물리적인 면으로 취급하였으며, 분석결과를 출사동공법과 같은 기존 방법들에 의한 것과 회절차수 합성법에 의한 것과 비교하였다. An F/1.2 infrared optical system that involves two aspheric BD-2 lenses and an aspheric diffractive surface was designed over $8-14{\mu}m$ with a field angle of $15.2^{\circ}$. The system may be used in uncooled cameras and is analyzed using beam synthesis propagation (BSP). The diffractive surface is modeled as a physical surface with a given thickness, and results are compared with those obtained by conventional methods, such as the exit-pupil method and a method which superposes diffraction orders.
차혜민,공현배,이수홍 (사)한국CDE학회 2017 한국CAD/CAM학회학회지 Vol.23 No.2
본 논문은 테오얀센 메커니즘을 적용한 보행 로봇 형상 및 라인 트레이싱을 위한 센서의 최적 설계를 수행한다. 소프트웨어를 활용하여 보행 로봇의 운동학적 해석(보행 곡선 추적, Ground Length, Ground Angle Coefficient), 최적화 및 상세 설계, 센서 추적 관련 시뮬레이션을 수행하고 분석하여 속도가 빠르며 안정적으로 주행하는 테오얀센 메커니즘 모델을 제안한다.
Hybrid 렌즈를 이용한 비냉각 열상장비 광학계 설계 및 분석
옥창민,공현배,박현우 한국광학회 2017 한국광학회지 Vol.28 No.5
This paper presents the design and evaluation of the optical system for an uncooled thermal-imaging camera. The operatingwavelength range of this system is from 7.7 μm to 12.8 μm. Through optimization, we have obtained a LWIR (Long WaveInfrared) optical system with a focal length of 5.44 mm, which consists of four aspheric surfaces and two diffractive surfaces. The f-number of the optical system is F/1.2, and its field of view is 90° × 67.5°. The hybrid lens was used to balance thehigher-order aberrations, and its diffraction properties were evaluated by scalar diffraction theory. We calculated the polychromaticintegrated diffraction efficiency, and the MTF drop generated by background noise. We have evaluated the thermal compensationof a LWIR fixed optical system, which is optically passively athermalized to maintain MTF performance in the focal depth. Inconclusion, these design results are useful for an uncooled thermal-imaging camera.
Presampled MTF 기법에서 Slant Target의 다양한 각도에 대한함수 Fitting이 적용된 MTF 측정기법에 관한 연구
최시연,김정환,공현배,김동환,백경훈,박인구,전효원,이기남 한국광학회 2022 한국광학회지 Vol.33 No.6
Presampled modulation transfer function (presampled MTF) 측정에서 Slant 표적각도 변화에 따라 MTF 결과의 차이를 있음을 확인 하였고, 표적각도 변화에 대한 오차를 줄이기 위하여 획득한 edge spread function (ESF) 그래프를 fitting하여 측정값의 오차를 줄일 수 있는 측정기법을 연구하였다. Presampled MTF 방법의 특성상 표적이 회전함에 따라 투영되는 공간주파수의 강도분포는 표적의 회전각도에 따라 변화하며, 이로 인하여 MTF 차이가 발생함을 확인하였다. 이 연구에서는 획득한 영상의 1개의 열에 대해서만 fitting을 한 후 MTF를 계산 하였다. Fitting을 이용한 계산은 기존의 presampled MTF 방법과 비교하여 표적 회전에 따른 오차가 줄어듬을 확인하였다. 이 방법은 MTF 를 이용한 자동 초점 등 다양한 각도의 표적에 응용이 가능할 것으로 기대된다.
Common Optical System for the Fusion of Three-dimensional Images and Infrared Images
김덕래,정 보 희,공현배,옥창민,이 승 태 한국광학회 2019 Current Optics and Photonics Vol.3 No.1
We describe a common optical system that merges a LADAR system, which generates a point cloud, and a more traditional imaging system operating in the LWIR, which generates image data. The optimum diameter of the entrance pupil was determined by analysis of detection ranges of the LADAR sensor, and the result was applied to design a common optical system using LADAR sensors and LWIR sensors; the performance of these sensors was then evaluated. The minimum detectable signal of the 128 × 128-pixel LADAR detector was calculated as 20.5 nW. The detection range of the LADAR optical system was calculated to be 1,000 m, and according to the results, the optimum diameter of the entrance pupil was determined to be 15.7 cm. The modulation transfer function (MTF) in relation to the diffraction limit of the designed common optical system was analyzed and, according to the results, the MTF of the LADAR optical system was 98.8% at the spatial frequency of 5 cycles per millimeter, while that of the LWIR optical system was 92.4% at the spatial frequency of 29 cycles per millimeter. The detection, recognition, and identification distances of the LWIR optical system were determined to be 5.12, 2.82, and 1.96 km, respectively.
An evaluation methodology for 3D deep neural networks using visualization in 3D data classification
황현태,이수홍,Hyung Gun Chi,강남규,공현배,Jiaqi Lu,옥형석 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3
"Making 3D deep neural networks debuggable". In the study, we develop and propose a 3D deep neural network visualization methodology for performance evaluation of 3D deep neural networks. Our research was conducted using a 3D deep neural network model, which shows the best performance. The visualization method of the research is a method of visualizing part of the 3D object by analyzing the naive Bayesian 3D complement instance generation method and the prediction difference of each feature. The method emphasizes the influence of the network in the process of making decisions. The result of visualization through the algorithm of the study shows a clear difference based on the result class and the instance within the class, and the authors can obtain insight that can evaluate and improve the performance of the DNN (deep neural networks) model by the analyzed results. 3D deep neural networks can be made "indirectly debuggable", and after the completion of the visualization method and the analysis of the result, the method can be used as the evaluation method of "general non-debuggable DNN" and as a debugging method.