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Integrated Optimization Design of Carbon Fiber Composite Framework for Small Lightweight Space Camera 小型轻量化空间相机碳纤维复合材料框架整体优化设计
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.389
Shuai Yang, W. Sha, Changzheng Chen, Xingxiang Zhang, Jianyue Ren
{"title":"Integrated Optimization Design of Carbon Fiber Composite Framework for Small Lightweight Space Camera","authors":"Shuai Yang, W. Sha, Changzheng Chen, Xingxiang Zhang, Jianyue Ren","doi":"10.3807/JOSK.2016.20.3.389","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.389","url":null,"abstract":"A Carbon Fiber Composite (CFC) framework was designed for a small lightweight space camera. According to the distribution characteristics of each optical element in the optical system, CFC (M40J) was chosen to accomplish the design of the framework. TC4 embedded parts were used to solve the low accuracy of the CFC framework interface problem. An integrated optimization method and the optimization strategy which combined a genetic global optimization algorithm with a downhill simplex local optimization algorithm were adopted to optimize the structure parameters of the framework. After optimization, the total weight of the CFC framework and the TC4 embedded parts is 15.6 kg, accounting for only 18.4% that of the camera. The first order frequency of the camera reaches 104.8 Hz. Finally, a mechanical environment test was performed, and the result demonstrates that the first order frequency of the camera is 102 Hz, which is consistent with the simulation result. It further verifies the rationality and correctness of the optimization result. The integrated optimization method mentioned in this paper can be applied to the structure design of other space cameras, which can greatly improve the structure design efficiency.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"389-395"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140453","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: 3
Optical Encryption of a Binary Image by Phase Modulation of the Wavefront 基于波前相位调制的二值图像的光学加密
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.358
Jaehun Song, I. Moon, Yeon H. Lee
{"title":"Optical Encryption of a Binary Image by Phase Modulation of the Wavefront","authors":"Jaehun Song, I. Moon, Yeon H. Lee","doi":"10.3807/JOSK.2016.20.3.358","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.358","url":null,"abstract":"We present a new scheme for optical encryption of a binary image. In our method, the original binary data page is first divided into two identical pages. In each data page, the “on” and “off” pixels are represented by two discrete phases that are 90° apart. The first page corresponds to the phase conjugation of the second page, and vice versa. In addition, the wavefront of the two data pages is changed simultaneously from planar to spherical, for better encryption. The wavefront modification is represented by an extra phase shift, which is a function of position on the wavefront. In this way the two separate pages are both encrypted, and therefore the pages cannot be distinguished in a CCD. If the first page is used as an encrypted data page, then the second page is used as the decryption key, and vice versa. The decryption can be done by simply combining the two encrypted data pages. It is shown in our experiment that encryption and decryption can be fully accomplished in the optical domain.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"358-362"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70139469","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
Kalman Filter Based Optimal Controllers in Free Space Optics Communication 基于卡尔曼滤波的自由空间光通信最优控制器
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.368
Zhaokun Li, Xiaohui Zhao
{"title":"Kalman Filter Based Optimal Controllers in Free Space Optics Communication","authors":"Zhaokun Li, Xiaohui Zhao","doi":"10.3807/JOSK.2016.20.3.368","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.368","url":null,"abstract":"There is no doubt that adaptive optics (AO) is the most promising method to compensate wavefront disturbance in free space optics communication (FSO). In order to improve the performance of the AO system described by discrete-time linear system model with time-delay and implicit phase turbulent model, new controllers based on a Kalman filter and its extensions are proposed. Based on the standard Kalman filter, we propose a fading memory filter to deal with the ruleless strong interference; sequential and U-D filters are applied to reduce implementation complexity for the embedded controllers. Theoretical analysis and the numerical simulations show that the proposed fading memory filter can upgrade the performance for AO systems in consideration of the unforeseen strong pulse interference, and the sequential and U-D filters perform well compared with a Kalman filter.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"368-380"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140380","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
Resolution Enhanced Computational Integral Imaging Reconstruction by Using Boundary Folding Mirrors 基于边界折叠镜的分辨率增强计算积分成像重建
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.363
Yongri Piao, Luyan Xing, Miao Zhang, Min-Chul Lee
{"title":"Resolution Enhanced Computational Integral Imaging Reconstruction by Using Boundary Folding Mirrors","authors":"Yongri Piao, Luyan Xing, Miao Zhang, Min-Chul Lee","doi":"10.3807/JOSK.2016.20.3.363","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.363","url":null,"abstract":"In this paper, we present a resolution-enhanced computational integral imaging reconstruction method by using boundary folding mirrors. In the proposed method, to improve the resolution of the computationally reconstructed 3D images, the direct and reflected light information of the 3D objects through a lenslet array with boundary folding mirrors is recorded as a combined elemental image array. Then, the ray tracing method is employed to synthesize the regular elemental image array by using a combined elemental image array. From the experimental results, we can verify that the proposed method can improve the visual quality of the computationally reconstructed 3D images.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"363-367"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70139521","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: 6
Simple Autocorrelation Measurement by Using a GaP Photoconductive Detector 利用GaP光导检测器进行简单的自相关测量
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.435
Seong-Il Shin, Y. Lim
{"title":"Simple Autocorrelation Measurement by Using a GaP Photoconductive Detector","authors":"Seong-Il Shin, Y. Lim","doi":"10.3807/JOSK.2016.20.3.435","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.435","url":null,"abstract":"We developed a simple and real-time readout autocorrelator for several tens and sub-10fs pulses, based on the two photon absorption phenomena of a commercial GaP photodetector including a transimpedance amplifier. With a suitable gain adjustment, we demonstrated that the interferometric autocorrelation for sub-nJ pulses delivered as a high output voltage as to resolve all fringes in an autocorrelation trace with features of low noise and a low offset voltage. By fitting the measured quadratic power dependence of output voltages, we obtained the quantum efficiency of TPA for the GaP detector comparable with those of a GaAsP diode and an SHG with a thin BBO crystal. The autocorrelator of a TPA based GaP photodetector is highly suitable for sensitively measuring a few cycle pulses with a broad spectral distribution from 600 nm to 1100 nm.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"435-440"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140259","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: 5
High-precision THz Dielectric Spectroscopy of Tris-HCl Buffer Tris-HCl缓冲液的高精度太赫兹介电光谱
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.431
Soonsung Lee, Hyeona Kang, Y. Do, Gyuseok Lee, Jin-Woo Kim, Haewook Han
{"title":"High-precision THz Dielectric Spectroscopy of Tris-HCl Buffer","authors":"Soonsung Lee, Hyeona Kang, Y. Do, Gyuseok Lee, Jin-Woo Kim, Haewook Han","doi":"10.3807/JOSK.2016.20.3.431","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.431","url":null,"abstract":"Tris-HCl buffer solution is extensively used in biochemistry and molecular biology to maintain a stable pH for biomolecules such as nucleic acids and proteins. Here we report on the high-precision THz dielectric spectroscopy of a 10 mM Tris-HCl buffer. Using a double Debye model, including conductivity of ionic species, we measured the complex dielectric functions of Tris-HCl buffer. The fast relaxation time of water molecules in Tris-HCl buffer is ~20% longer than that in pure water while the slow relaxation time changes little. This means that the reorientation dynamics of Tris-HCl buffer with such a low Tris concentration is quite different from that of pure water.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"431-434"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140253","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: 3
Analysis of the Square Beam Energy Efficiency of a Homogenizer Near the Target for Laser Shock Peening 激光冲击强化靶区均匀器方束能量效率分析
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.407
Taeshin Kim, Seungjin Hwang, K. Hong, T. Yu
{"title":"Analysis of the Square Beam Energy Efficiency of a Homogenizer Near the Target for Laser Shock Peening","authors":"Taeshin Kim, Seungjin Hwang, K. Hong, T. Yu","doi":"10.3807/JOSK.2016.20.3.407","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.407","url":null,"abstract":"We analyzed through numerical simulations the properties of a square beam homogenizer near the target for laser shock peening. The efficiency was calculated near the target by considering the plasma threshold of the metals. We defined the depth of focus of the square beam homogenizer with a given efficiency near the target. Then, we found the relationship between the depth of focus for the laser shock peening and four main parameters of the square beam homogenizer: the plasma threshold of the metal, the number of lenslets in the array-lens, the focal length of the condenser lens and the input beam size.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"91 1","pages":"407-412"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140091","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
Lens design of camera through optimization of the third order seidel aberration and statistical tolerance analysis 通过三阶塞德尔像差的优化和统计容差分析，对相机的镜头进行设计
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.413
Kyutae Lee, Young-Joo Kim, Youngwoong Kim
{"title":"Lens design of camera through optimization of the third order seidel aberration and statistical tolerance analysis","authors":"Kyutae Lee, Young-Joo Kim, Youngwoong Kim","doi":"10.3807/JOSK.2016.20.3.413","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.413","url":null,"abstract":"There has been much advancement in the field of aerial cameras for geographical features with the help of drones, image processing power and computer aided optical programs. In this study, we propose a new optical lens design technique which minimizes the amount of ‘the third order Seidel aberration’ for enhancing MTF. In addition, we suggest a new optical lens design which stabilizes the mass-production yield through R.S.M and has robustness secure through the Taguchi method. Eventually, the image processing algorithm of stereo matching is implemented in order to evaluate whether the proposed lens design result meets adequate specifications for the use of dual aerial photographs or not. This paper provides good guidance for the optical design by development of experiments.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"413-426"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140109","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: 0
Performance Enhancement of Cavity Assisted Photonic Crystal De-Multiplexerin Slow Light Regime 慢光环境下腔辅助光子晶体解复用性能的增强
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.401
Mohammad-Hashem Vadjed-Samiei, H. Aghababaeian
{"title":"Performance Enhancement of Cavity Assisted Photonic Crystal De-Multiplexerin Slow Light Regime","authors":"Mohammad-Hashem Vadjed-Samiei, H. Aghababaeian","doi":"10.3807/JOSK.2016.20.3.401","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.401","url":null,"abstract":"This study first proposes a new version of a photonic crystal based de-multiplexer operating under the slow light regime, secondly analyses the structure numerically to demonstrate de-multiplexing operation and finally studies the impact of light speed on the performance of the proposed structure. The operation wavelength is 1.55 µm. The study indicates that, by adjusting the speed of light, around 0.1C, in the main waveguide and in the output channels’ waveguides, an enhancement in the performance of the de-multiplexer will be gained.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"401-406"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140048","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: 3
Measurement of the Modulation Transfer Function of Infrared Imaging System by Modified Slant Edge Method 改进斜边法测量红外成像系统调制传递函数
Journal of the Optical Society of Korea Pub Date : 2016-06-01 DOI: 10.3807/JOSK.2016.20.3.381
Hang Li, Changxiang Yan, Jianbin Shao
{"title":"Measurement of the Modulation Transfer Function of Infrared Imaging System by Modified Slant Edge Method","authors":"Hang Li, Changxiang Yan, Jianbin Shao","doi":"10.3807/JOSK.2016.20.3.381","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.3.381","url":null,"abstract":"The performance of a staring infrared imaging system can be characterized based on estimating the modulation transfer function (MTF). The slant edge method is a widely used MTF estimation method, which can effectively solve the aliasing problem caused by the discrete undersampling of the infrared focal plane array. However, the traditional slant edge method has some limitations such as the low precision of the edge angle extraction and using the approximate function to fit the edge spread function (ESF), which affects the accuracy of the MTF estimation. In this paper, we propose a modified slant edge method, including an edge angle extraction method that can improve the precision of the edge angle extraction and an ESF fitting algorithm which is based on the transfer function model of the imaging system, to enhance the accuracy of the MTF estimation. This modified slant edge method presents higher estimation accuracy and better immunity to noise and edge angle than other traditional methods, which is demonstrated by the simulation and application experiments operated in our study.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"381-388"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140430","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: 19
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