Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6271001
Yuanjun Wang, S. Nie
In this paper, we extend a new registration framework from scalar image to diffusion tensor image. As the extension from scalar to tensor image is non-trivial, we write the process in detail. The registration framework is based on polynomial expansion transform. The idea of polynomial expansion is that the image is locally approximated by polynomials at each pixel. Registration algorithms are developed for affine model by observing the changes between source and target images locally, from their polynomial expansion coefficients. Experiments are tested on human diffusion tensor images.
{"title":"Diffusion Tensor Image Registration Based on Polynomial Expansion","authors":"Yuanjun Wang, S. Nie","doi":"10.1109/SOPO.2012.6271001","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6271001","url":null,"abstract":"In this paper, we extend a new registration framework from scalar image to diffusion tensor image. As the extension from scalar to tensor image is non-trivial, we write the process in detail. The registration framework is based on polynomial expansion transform. The idea of polynomial expansion is that the image is locally approximated by polynomials at each pixel. Registration algorithms are developed for affine model by observing the changes between source and target images locally, from their polynomial expansion coefficients. Experiments are tested on human diffusion tensor images.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"201 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115703727","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270547
Changhai Deng, X. Wan, Zhi-min Zhang, Jiakun Zhao, Jianhua Ye, Qi Chen, P. Huang, Wei Yu
Numerical modeling of high temperature pressure pipes including delaminations were constructed using ANSYS, then heat flux and convection are loaded on the outside surface. The influence of pulse excitation parameters, depth of defects, thickness of defects, length of defects on maximum thermal contrast and time for maximum thermal contrast are analysised. Length of defects are measured by using the methed of full width at half maximum .According to the research result, it is known that the maximum thermal contrast increased linearly with the product of excitation time and heat flux. It increases also as the defect gets thicker and less deeper, but will not increase always as the length of defects increase. As to the time for maximum thermal contrast, it appears more later with longer excitation time, deeper and thicker defects, however, which has nothing to do with the heat flux. Full wide at half maximum is a good method to measure the length of defects for its small error.
{"title":"Numerical Modelling and Analysis of Infrared Testing in Delaminations of Pressurepipes Using ANSYS","authors":"Changhai Deng, X. Wan, Zhi-min Zhang, Jiakun Zhao, Jianhua Ye, Qi Chen, P. Huang, Wei Yu","doi":"10.1109/SOPO.2012.6270547","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270547","url":null,"abstract":"Numerical modeling of high temperature pressure pipes including delaminations were constructed using ANSYS, then heat flux and convection are loaded on the outside surface. The influence of pulse excitation parameters, depth of defects, thickness of defects, length of defects on maximum thermal contrast and time for maximum thermal contrast are analysised. Length of defects are measured by using the methed of full width at half maximum .According to the research result, it is known that the maximum thermal contrast increased linearly with the product of excitation time and heat flux. It increases also as the defect gets thicker and less deeper, but will not increase always as the length of defects increase. As to the time for maximum thermal contrast, it appears more later with longer excitation time, deeper and thicker defects, however, which has nothing to do with the heat flux. Full wide at half maximum is a good method to measure the length of defects for its small error.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"659 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116096404","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270563
Pengfei Wang, M. Ding, G. Brambilla, Y. Semenova, Qiang Wu, G. Farrell
The application of microfibre couplers in a comb-filter-based ratiometric wavelength measurement system is discussed. The fabrication of microfibre coupler is presented and its temperature-dependent performance is investigated. The resolution of the ratiometric wavelength measurement system with a microfiber coupler is significantly improved in comparison with a conventional ratiometric system to better than 4 pm maintaining the potential for high measurement speed and wide measurable wavelength range.
{"title":"Resolution Improvement of a Ratiometric Wavelength Measurement System by Using an Optical Microfibre Coupler","authors":"Pengfei Wang, M. Ding, G. Brambilla, Y. Semenova, Qiang Wu, G. Farrell","doi":"10.1109/SOPO.2012.6270563","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270563","url":null,"abstract":"The application of microfibre couplers in a comb-filter-based ratiometric wavelength measurement system is discussed. The fabrication of microfibre coupler is presented and its temperature-dependent performance is investigated. The resolution of the ratiometric wavelength measurement system with a microfiber coupler is significantly improved in comparison with a conventional ratiometric system to better than 4 pm maintaining the potential for high measurement speed and wide measurable wavelength range.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114695969","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270985
P. Zobdeh, M. Daftari
The high order harmonics generation could be observed by the interaction between few-cycle laser pulses and plasma. Introduction of the different models in generation of high order harmonics causes the different power-law spectrum. In this paper, we have studied the effect of sliding and oscillating mirrors models and filtering effects of conductors on high order harmonics generated by these models. The optical specification of all filters materials are .calculated by WIEN2K code based on solid state matter structure.
{"title":"Comparision of XUV Filtering by Solid Layer for Attosecond Generation","authors":"P. Zobdeh, M. Daftari","doi":"10.1109/SOPO.2012.6270985","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270985","url":null,"abstract":"The high order harmonics generation could be observed by the interaction between few-cycle laser pulses and plasma. Introduction of the different models in generation of high order harmonics causes the different power-law spectrum. In this paper, we have studied the effect of sliding and oscillating mirrors models and filtering effects of conductors on high order harmonics generated by these models. The optical specification of all filters materials are .calculated by WIEN2K code based on solid state matter structure.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115331772","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}
A far-field interferometry is presented to track the 3D positions of an optically trapped particle. This method can resolve the displacement within nanometers by measuring the intensity shift in the back-focal-plane of the lens which is introduced by the interference between the outgoing laser beam and scattered light from the trapped particle. Factors that affect its characteristics are elaborately analyzed using approximate formula and FDTD stimulation. Also, we propose a valid method to minimize the thermal noise that introduced by Brownian motion of the trapped particle.
{"title":"Back-Focal-Plane Interferometry for 3D Position Tracking in Optical Tweezers","authors":"Hongjun Liu, Hui-zhu Hu, Minqiang Tie, Wei Zhang, Yu-qing Shen","doi":"10.1109/SOPO.2012.6270909","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270909","url":null,"abstract":"A far-field interferometry is presented to track the 3D positions of an optically trapped particle. This method can resolve the displacement within nanometers by measuring the intensity shift in the back-focal-plane of the lens which is introduced by the interference between the outgoing laser beam and scattered light from the trapped particle. Factors that affect its characteristics are elaborately analyzed using approximate formula and FDTD stimulation. Also, we propose a valid method to minimize the thermal noise that introduced by Brownian motion of the trapped particle.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121126288","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6271121
Jiasheng Tian, Qiaoyun Liu, P. Tan, Jian-Hui Shi, M. Fan, Deng Yue, Y. Pei
In this paper some key technologies of an optical cavity for a compact Terahertz(THz) Source Based on Free Electron Lasers(FEL) were studied. Firstly, the theory of THz radiation was analyzed by some calculations. The high quality electronic bunch beams with energy 5.6-9.9MeV can produce THz radiation with frequency 1-10THz. Secondly, the configuration of the optical cavity was calculated and studied, and some conditions were discussed in order to obtain a single resonance mode. Thirdly, The loss caused by the diffraction and the coupling aperture was calculated. Finally, an idea of designing an optical cavity and some important data were given.
{"title":"The Study of the Optical Cavity for a Compact Terahertz Source Based on Free Electron Lasers","authors":"Jiasheng Tian, Qiaoyun Liu, P. Tan, Jian-Hui Shi, M. Fan, Deng Yue, Y. Pei","doi":"10.1109/SOPO.2012.6271121","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6271121","url":null,"abstract":"In this paper some key technologies of an optical cavity for a compact Terahertz(THz) Source Based on Free Electron Lasers(FEL) were studied. Firstly, the theory of THz radiation was analyzed by some calculations. The high quality electronic bunch beams with energy 5.6-9.9MeV can produce THz radiation with frequency 1-10THz. Secondly, the configuration of the optical cavity was calculated and studied, and some conditions were discussed in order to obtain a single resonance mode. Thirdly, The loss caused by the diffraction and the coupling aperture was calculated. Finally, an idea of designing an optical cavity and some important data were given.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123572082","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270438
Xiqu Chen, Jie Li, Y. Hu, M. Li
In this paper, the physical thermal model for a typical optical switch based on VO2 thin film is built, according to which the response time parameter expression of the optical switch is obtained in theory. The expression of the response time parameter reveals key factors relevant to the switching speed of optical switch based on VO2 thin film and theoretically gives directions to improve the switching speed of this kind of optical switch. Furthermore, the proposed measurement means of response time parameter can be utilized to practical measure and test on optical switch.
{"title":"Theoretical Analysis and Experimental Measurement on the Response Time of Optical Switch Based on VO2 Thin Film","authors":"Xiqu Chen, Jie Li, Y. Hu, M. Li","doi":"10.1109/SOPO.2012.6270438","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270438","url":null,"abstract":"In this paper, the physical thermal model for a typical optical switch based on VO2 thin film is built, according to which the response time parameter expression of the optical switch is obtained in theory. The expression of the response time parameter reveals key factors relevant to the switching speed of optical switch based on VO2 thin film and theoretically gives directions to improve the switching speed of this kind of optical switch. Furthermore, the proposed measurement means of response time parameter can be utilized to practical measure and test on optical switch.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117331229","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270523
L. Li, G. Liu, K. Huang, Y. Chen, L. Gong, F. Tang
A channel drop filter combination of a circular ring resonator and two point defect micro-cavities was proposed. The ring resonator works as an energy coupler via capturing the electromagnetic energy propagated in the input waveguide and sends it to the output waveguide at its resonant frequencies. And the point defect micro-cavities are used to further filter the original lightwave. In our designed CDF, the drop efficiency close to 100% at the center normalized frequency 0.342 and nearly 98% at the center normalized frequency 0.334 have been achieved.
{"title":"A New Photonic Crystal Channel Drop Filter","authors":"L. Li, G. Liu, K. Huang, Y. Chen, L. Gong, F. Tang","doi":"10.1109/SOPO.2012.6270523","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270523","url":null,"abstract":"A channel drop filter combination of a circular ring resonator and two point defect micro-cavities was proposed. The ring resonator works as an energy coupler via capturing the electromagnetic energy propagated in the input waveguide and sends it to the output waveguide at its resonant frequencies. And the point defect micro-cavities are used to further filter the original lightwave. In our designed CDF, the drop efficiency close to 100% at the center normalized frequency 0.342 and nearly 98% at the center normalized frequency 0.334 have been achieved.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129253531","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270950
Cheng Yang, Rong Lu, Niannian Chen
How to extract the features quickly and correctly is the essential precondition for image identification and classification. As there existing large computation problems in the traditional feature extraction algorithms, this paper proposes a faster algorithm. Firstly, the image connected region is encoded by using the Vertex Chain Code to map as a closed area. Then a unified computational framework is developed to combine the Vertex Chain Code and Discrete Green, turning surface integral into line integral. Experimental results show that this algorithm is fast and effective, and can be used for special area.
{"title":"A Fast Algorithm for Image Geometric Feature Parameters Extraction","authors":"Cheng Yang, Rong Lu, Niannian Chen","doi":"10.1109/SOPO.2012.6270950","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270950","url":null,"abstract":"How to extract the features quickly and correctly is the essential precondition for image identification and classification. As there existing large computation problems in the traditional feature extraction algorithms, this paper proposes a faster algorithm. Firstly, the image connected region is encoded by using the Vertex Chain Code to map as a closed area. Then a unified computational framework is developed to combine the Vertex Chain Code and Discrete Green, turning surface integral into line integral. Experimental results show that this algorithm is fast and effective, and can be used for special area.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129634332","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}
Pub Date : 2012-05-21DOI: 10.1109/SOPO.2012.6270928
Qianghua Li, Shecheng Gao
We completely study the wavelength dependency of polarization dependent loss (PDL) for uniform fiber Bragg gratings (FBGs) written in single mode fibers (SMF). Effective PDL (PDLeff) and simulations are carried out using the coupled mode theory and the Jones formalism. We analyze the evolution with wavelength of PDLeff as a function of the grating parameters and the birefringence value. We demonstrate that the PDLeff evolutions with wavelength can be strongly enhanced by a modification of the grating parameters. Our work brings a complete characterization of PDLeff in FBGs and presents a good agreement between theory and experience.
{"title":"Spectral Characterization of Polarization Dependent Loss in Uniform Fiber Bragg Gratings in Reflection","authors":"Qianghua Li, Shecheng Gao","doi":"10.1109/SOPO.2012.6270928","DOIUrl":"https://doi.org/10.1109/SOPO.2012.6270928","url":null,"abstract":"We completely study the wavelength dependency of polarization dependent loss (PDL) for uniform fiber Bragg gratings (FBGs) written in single mode fibers (SMF). Effective PDL (PDLeff) and simulations are carried out using the coupled mode theory and the Jones formalism. We analyze the evolution with wavelength of PDLeff as a function of the grating parameters and the birefringence value. We demonstrate that the PDLeff evolutions with wavelength can be strongly enhanced by a modification of the grating parameters. Our work brings a complete characterization of PDLeff in FBGs and presents a good agreement between theory and experience.","PeriodicalId":159850,"journal":{"name":"2012 Symposium on Photonics and Optoelectronics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129787283","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}
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