Journal of the Optical Society of Korea最新文献_第4页

Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination 窄均匀照明双自由曲面全内反射LED透镜的设计方法

Journal of the Optical Society of Korea Pub Date : 2016-10-01 DOI: 10.3807/JOSK.2016.20.5.614

Jae Suk Yang, Jae-Hyeung Park, O. Beom-hoan, Se-Guen Park, S. G. Lee

{"title":"Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination","authors":"Jae Suk Yang, Jae-Hyeung Park, O. Beom-hoan, Se-Guen Park, S. G. Lee","doi":"10.3807/JOSK.2016.20.5.614","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.614","url":null,"abstract":"In this paper, we propose a novel differential equation method for\u0000 designing a total internal reflection (TIR) LED lens with double freeform\u0000 surfaces. A complete set of simultaneous differential equations for the\u0000 method is derived from the condition for minimizing the Fresnel loss,\u0000 illumination models, Snell's Law of ray propagation, and a new\u0000 constraint on the incident angle of a ray on the light-exiting surface of\u0000 the lens. The last constraint is essential to complete the set of\u0000 simultaneous differential equations. By adopting the TIR structure and\u0000 applying the condition for minimizing the Fresnel loss, it is expected\u0000 that the proposed TIR LED lens can have a high luminous flux efficiency,\u0000 even though its beam-spread angle is narrow. To validate the proposed\u0000 method, three TIR LED lenses with beam-spread angles of less than\u0000 22.6° have been designed, and their performances evaluated by ray\u0000 tracing. Their luminous flux efficiencies could be obviously increased by\u0000 at least 35% and 5%, compared to conventional LED lenses with a single\u0000 freeform surface and with double freeform surfaces,\u0000 respectively.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"614-622"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Convergence Point Adjustment Improving Visual Discomfort for a Zoom on a Stereoscopic Camera 收敛点调整改善视觉不适的变焦立体相机

Journal of the Optical Society of Korea Pub Date : 2016-10-01 DOI: 10.3807/JOSK.2016.20.5.633

J. Ha, D. Kim, Dong Hyun Kim

引用次数: 1

Comparison Study of Long-haul 100-Gb/s DDO-OFDM and CO-OFDM WDM Systems 远距离100gb /s ddoofdm与CO-OFDM WDM系统的比较研究

Journal of the Optical Society of Korea Pub Date : 2016-10-01 DOI: 10.3807/JOSK.2016.20.5.557

Ling Liu, S. Xiao, Meihua Bi, Lu Zhang

引用次数: 3

Highly Birefringent and Dispersion Compensating Photonic Crystal Fiber Based on Double Line Defect Core 基于双线缺陷芯的高双折射色散补偿光子晶体光纤

Journal of the Optical Society of Korea Pub Date : 2016-10-01 DOI: 10.3807/JOSK.2016.20.5.567

Yong Soo Lee, Chung-Ghiu Lee, Yongmin Jung, M. Oh, Soeun Kim

引用次数: 28

A Luminance Compensation Method Using Optical Sensors with Optimized Memory Size for High Image Quality AMOLED Displays 高图像质量AMOLED显示器的光传感器亮度补偿方法

Journal of the Optical Society of Korea Pub Date : 2016-10-01 DOI: 10.3807/JOSK.2016.20.5.586

Kyong-Hwan Oh, Seongkwan Hong, O. Kwon

{"title":"A Luminance Compensation Method Using Optical Sensors with Optimized Memory Size for High Image Quality AMOLED Displays","authors":"Kyong-Hwan Oh, Seongkwan Hong, O. Kwon","doi":"10.3807/JOSK.2016.20.5.586","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.586","url":null,"abstract":"This paper proposes a luminance compensation method using optical sensors to achieve high luminance uniformity of active matrix organic light-emitting diode (AMOLED) displays. The proposed method compensates for the non-uniformity of luminance by capturing the luminance of entire pixels and extracting the characteristic parameters. Data modulation using the extracted characteristic parameters is performed to improve luminance uniformity. In addition, memory size is optimized by selecting an optimal bit depth of the extracted characteristic parameters according to the trade-off between the required memory size and luminance uniformity. To verify the proposed compensation method with the optimized memory size, a 40-inch 1920x1080 AMOLED display with a target maximum luminance of 350 cd/m2 is used. The proposed compensation method considering a 4σ range of luminance reduces luminance error from ± 38.64%, ± 36.32%, and ± 43.12% to ± 2.68%, ± 2.64%, and ± 2.76% for red, green, and blue colors, respectively. The optimal bit depth of each characteristic parameter is 6-bit and the total required memory size to achieve high luminance uniformity is 74.6 Mbits.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"586-592"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Cooling Geometry Dependent Operation Properties in a Diode End-Pumped Monolithic Yb:YAG Laser 二极管端面泵浦单片Yb:YAG激光器的冷却几何特性

Journal of the Optical Society of Korea Pub Date : 2016-10-01 DOI: 10.3807/JOSK.2016.20.5.593

H. Moon, C. Lim

引用次数: 0

All-Optical Bit-Rate Flexible NRZ-to-RZ Conversion Using an SOA-Loop Mirror and a CW Holding Beam 利用soa环镜和连续波保持波束实现全光位速率灵活的nrz - rz转换

Journal of the Optical Society of Korea Pub Date : 2016-08-25 DOI: 10.3807/JOSK.2016.20.4.464

Hyuek-Jae Lee

引用次数: 0

Study of Spectral Reflectance Reconstruction Based on an Algorithm for Improved Orthogonal Matching Pursuit 基于改进正交匹配追踪算法的光谱反射率重建研究

Journal of the Optical Society of Korea Pub Date : 2016-08-25 DOI: 10.3807/JOSK.2016.20.4.515

Leihong Zhang, Liangyu Dong, Z. Dawei, Xiumin Gao, Xiuhua Ma

{"title":"Study of Spectral Reflectance Reconstruction Based on an Algorithm for Improved Orthogonal Matching Pursuit","authors":"Leihong Zhang, Liangyu Dong, Z. Dawei, Xiumin Gao, Xiuhua Ma","doi":"10.3807/JOSK.2016.20.4.515","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.4.515","url":null,"abstract":"Spectral reflectance is sparse in space, and while the traditional spectral-reconstruction algorithm does not make full use of this characteristic sparseness, the compressive sensing algorithm can make full use of it. In this paper, on the basis of analyzing compressive sensing based on the orthogonal matching pursuit algorithm, a new algorithm based on the Dice matching criterion is proposed. The Dice similarity coefficient is introduced, to calculate the correlation coefficient of the atoms and the residual error, and is used to select the atoms from a library. The accuracy of Spectral reconstruction based on the pseudo-inverse method, Wiener estimation method, OMP algorithm, and DOMP algorithm is compared by simulation on the MATLAB platform and experimental testing. The result is that spectral-reconstruction accuracy based on the DOMP algorithm is higher than for the other three methods. The root-mean-square error and color difference decreases with an increasing number of principal components. The reconstruction error decreases as the number of iterations increases. Spectral reconstruction based on the DOMP algorithm can improve the accuracy of color-information replication effectively, and high-accuracy color-information reproduction can be realized.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"515-523"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Design and Characteristic Measurement of 8000 mm Large Aperture Integrating Sphere 8000mm大孔径积分球的设计与特性测量

Journal of the Optical Society of Korea Pub Date : 2016-08-25 DOI: 10.3807/JOSK.2016.20.4.500

Zhao Zhang, Z. Wan, Xian-sheng Li, Hong-xing Liu, Jing-xu Sun, Ze-xun Liu, Ya-min Wang, Jianwei Ren, J. Ren

{"title":"Design and Characteristic Measurement of 8000 mm Large Aperture Integrating Sphere","authors":"Zhao Zhang, Z. Wan, Xian-sheng Li, Hong-xing Liu, Jing-xu Sun, Ze-xun Liu, Ya-min Wang, Jianwei Ren, J. Ren","doi":"10.3807/JOSK.2016.20.4.500","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.4.500","url":null,"abstract":"Integrating spheres play a central role in the radiometric calibration of remote sensors. With the development of the wide field of view (FOV) remote sensors, aperture diameters of remote sensors are becoming larger and larger. To satisfy the radiometric calibration requirements of full FOV and full aperture, an 8000mm diameter large aperture integrating sphere uniform source with a variable exit port was designed and manufactured. This integrating sphere will be used for pre-launch test and radiometric calibration of remote satellites. In this paper, optical theories were used to design the output spectral radiance. The LightTools software based on ray-tracing simulation method was used to determine the best combination and distribution of inner light sources. A spectral experiment was made to verify the spectral radiance design. To reduce the influence of longtime power-on, a new characteristic measurement method was developed to obtain the radiation characteristic of the integrating sphere, which could greatly improve the measuring efficiency. This method could also be applied to measure other large aperture uniform sources. The obtained results indicate that the spatial uniformity is 98.35%, and the angular uniformity at center position is 98.78%.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"500-509"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Effect of Filter Parameters on a Supercontinuum-Based All-Optical Tunable Thresholder 滤波器参数对基于超连续体的全光可调阈值的影响

Journal of the Optical Society of Korea Pub Date : 2016-08-25 DOI: 10.3807/JOSK.2016.20.4.470

Huatao Zhu, Rong Wang, T. Pu, Tao Fang, P. Xiang, Huihui Zhu

引用次数: 1