• Korean Journal of Optics and Photonics
• /
• v.30 no.5
• /
• pp.197-203
• /
• 2019

In this paper, we studied a reflector design that can improve the illuminance uniformity when using a xenon flash lamp in the photonic sintering process. To achieve complete sintering of substrates in the irradiated area, the light efficiency and illuminance uniformity were set to target performance. Existing elliptical reflectors or parabolic reflectors make it easy to satisfy the target light efficiency, but have difficulty satisfying the illuminance uniformity. In this paper, a twin-concave feature has been added to the center of the parabolic reflector to satisfy the illuminance uniformity. It was confirmed that the illuminance uniformity of the parabolic reflector with a twin-concave feature was improved, compared to that of the traditional reflector.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06d
• /
• pp.381-383
• /
• 2012

식물재배용 인공광 최적 배치에 따른 균일한 조도 분포는 고품질의 식물 생산을 가능하게 한다. 그러나 기존에 상용화된 식물재배시스템의 경우, 인공광 배치에 따른 조도 분포 시뮬레이션 등의 전처리 과정이 생략된 채 제작되어 생산 품질의 편차를 초래하는 문제점을 가지고 있다. 이에 본 논문은 식물재배단의 광 균일도 향상을 위해 조명 설계 소프트웨어인 Relux를 이용하여 LED 조명장치의 높이, 간격 등의 배치를 달리함에 따라 변화하는 각 재배단의 조도 분포 및 균일도, 그리고 전체 에너지 소비량 등을 사전에 시뮬레이션 함으로써 대상 식물재배에 적합한 조명장치의 최적 위치를 파악하고자 한다. 또한, 포터블 조도측정기를 이용하여 재배단의 각 식물의 위치를 기준으로 실 측정한 결과 데이터와 비교 분석 과정을 거쳐 본 시뮬레이션 결과의 신뢰도를 입증하고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.19 no.4
• /
• pp.954-964
• /
• 2015

In this research, an overlapped illumination model was newly proposed for designing a freeform LED lens with a uniform illuminance distribution on its illuminating plane. Based on the proposed model and conventional illumination models, freeform lenses were designed and their performances and tolerances were compared. As a result of the tolerance analysis about thickness change in lens, position, size change, central direction change of light emission and characteristic change in LED source. This proposed model and divergent illumination model are similar to the performance about central direction change of light emission in LED source. but the uniformity illumination value in this proposed model is more remarkably value than it in divergent illumination model about characteristic change in LED source.

• Korean Journal of Optics and Photonics
• /
• v.21 no.2
• /
• pp.61-68
• /
• 2010

Optical simulation methods were applied to the edge-lit LED backlight for LCD TV applications in order to optimize the optical structure of the light guide plate(LGP), and thus to improve the uniformity properties by removing the bright spots caused by LED's. The edge-lit LED backlight consisted of three white LED's with a lamp cover, a light guide plate, and a reflection film. When there was no pattern on the entrance side surface of the LGP, the illuminance uniformity was sensitively dependent on the distance d between the LED and the entrance surface. The illuminance uniformity increased with d but its increasing rate slowed down when d was beyond ~ 1.5 mm. When micro-patterns such as a lenticular lens array (LLA) or a serration pattern were formed on the entrance surface, the illuminance uniformity was improved substantially even for the case of very small d. At the same simulation condition, the lightguide with serration pattern showed a better uniformity than that with LLA pattern. Additional improvement could be achieved by changing the refractive index of the micro-patterns. These results suggest that using micro-patterns is a very effective way to reduce the bright spots due to their refracting function for the concentrated incident rays onto the LGP.

• KOREAN POULTRY JOURNAL
• /
• v.36 no.2 s.412
• /
• pp.80-82
• /
• 2004

육계의 균일도 향상을 위해서는 종계업자, 사료공장 및 농장주의 세심한 사양관리가 함께 이루어져야 하겠지만 본 원고에서는 농장단계의 사양관리 위주로 알아보고자 한다. 농장에서 균일도의 최대 성적을 얻기 위해서는 우수한 병아리의 선택과 함께 육추와 초기 성장 관리, 계시환경, 사육밀도, 급수 및 급이 관리, 깔짚의 관리, 환기관리가 농장단계에서 세심한 사양관리가 이루어져야 출하시 체중과 균일도에 매우 중요하게 작용한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.21 no.1
• /
• pp.157-164
• /
• 2017

In this research, the overlapped illumination model was used for designing a freeform LED lens with a uniform illuminance distribution on its illuminating plane, and their performances and tolerances were compared. And, the illuminations on a illumination plane was measures for change with average illuminance and illuminance uniformity. As a result of the tolerance analysis about z-axis direction change, thickness change in lens and tilt change of light emission and characteristic change in LED source, overlapped model and divergent illumination model are similar to the performance about Z-axis direction change of light emission in LED source. but the uniformity illumination value in this overlapped model is more remarkably value than it in divergent illumination model about thickness change in LED lens. Also, even though the lens based on a divergent illumination model showed good performance compare to the lens based on an overlapped illumination model, the latter was less the deviation to variation of LED beam radiation ability.

• Korean Journal of Optics and Photonics
• /
• v.30 no.4
• /
• pp.146-153
• /
• 2019

The exposure system is a device that transfers a circuit pattern to a desired location. To display patterns on a substrate without deforming the optical characteristics, the characteristics of the optical exposure system are very important. Therefore, to form a microcircuit pattern, a small divergence angle should impinge on the irradiation area. Also, since the light from the source must react uniformly with the photosensitizer, it must have high luminance efficiency and uniformity of illumination. In this paper a parabolic reflector and an aspherical lens were designed to solve the problem of narrow-angle implementation, and it was confirmed by simulation analysis after their arrangement that the beam angle, uniformity, and maximum illuminance satisfied the target performance.

• Journal of the Korean Society for Precision Engineering
• /
• v.24 no.4 s.193
• /
• pp.29-35
• /
• 2007

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.11a
• /
• pp.1009-1012
• /
• 2011

본 연구는 실내의 조도를 균일하게 유지하기 위한 조명제어시스템(LMS) 및 그 알고리즘에 관한 것으로 특히 창가 및 실내에 배치한 조도센서로부터 얻어지는 조도(Luminance)값들을 경계조건으로 하여 조도분포에 관한 수학적 모델을 세운 후 Laplace 방정식의 조화함수(수치해석적 해)를 컴퓨터로 고속 시뮬레이션 함으로써 외부의 밝기변화에 따른 실내 조명등의 조도 분포를 차별화하여 제어하여 결과적으로 전력을 절감하면서도 실내 근무자에게 균일하고 자연스러운 조명환경을 제공할 수 있는 적응형 조명제어장치 및 그 알고리즘의 연구 내용을 소개하고 있다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.23 no.7
• /
• pp.771-778
• /
• 2019

The traditional illuminance intensity detection method using a single sensor has a problem that uniformity of illuminance detection is deteriorated depending on the measurement position due to the narrow FOV characteristic. In order to overcome this problem, a method of detecting an average illuminance value through a plurality of illuminance sensors is used, but the complexity and detection error are increased. In this paper, we propose a illuminance intensity detection method based on a single image sensor with wide FOV. The proposed method can solve the problems such as system complexity and error increase of existing illuminance sensor. The test results show that the difference of average value is 12% using a illuminance sensor, 10.7% using five illuminance sensors, and 6.2% using an image sensor compared with the reference value using the color difference illuminometer. It is confirmed that the proposed method can easily and accurately detect the space illuminance with improved uniformity.