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Development of D_α band symmetrical visible optical diagnostic for boundary reconstruction on EAST tokamak
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作者 陈明 沈飊 +4 位作者 Shinichiro KADO 郭笔豪 陈大龙 蔡福瑞 肖炳甲 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第2期44-53,共10页
To investigate the potential of utilizing visible spectral imaging for controlling the plasma boundary shape during stable operation of plasma in future tokamak, a D_α band symmetric visible light diagnostic system w... To investigate the potential of utilizing visible spectral imaging for controlling the plasma boundary shape during stable operation of plasma in future tokamak, a D_α band symmetric visible light diagnostic system was designed and implemented on the Experimental Advanced Superconducting Tokamak(EAST). This system leverages two symmetric optics for joint plasma imaging. The optical system exhibits a spatial resolution less than 2 mm at the poloidal cross-section, distortion within the field of view below 10%, and relative illumination of 91%.The high-quality images obtained enable clear observation of both the plasma boundary position and the characteristics of components within the vacuum vessel. Following system calibration and coordinate transformation, the image coordinate boundary features are mapped to the tokamak coordinate system. Utilizing this system, the plasma boundary was reconstructed, and the resulting representation showed alignment with the EFIT(Equilibrium Fitting) results. This underscores the system's superior performance in boundary reconstruction applications and provides a diagnostic foundation for boundary shape control based on visible spectral imaging. 展开更多
关键词 visible optical diagnostic plasma boundary reconstruction EAST
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Visible light optical coherence tomography measures retinal oxygen metabolic response to systemic oxygenation 被引量:10
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作者 Ji Yi Wenzhong Liu +6 位作者 Siyu Chen Vadim Backman Nader Sheibani Christine M.Sorenson Amani A.Fawzi Robert A.Linsenmeier Hao F.Zhang 《Light(Science & Applications)》 SCIE EI CAS CSCD 2015年第1期197-206,共10页
The lack of capability to quantify oxygen metabolism noninvasively impedes both fundamental investigation and clinical diagnosis of a wide spectrum of diseases including all the major blinding diseases such as age-rel... The lack of capability to quantify oxygen metabolism noninvasively impedes both fundamental investigation and clinical diagnosis of a wide spectrum of diseases including all the major blinding diseases such as age-related macular degeneration,diabetic retinopathy,and glaucoma.Using visible light optical coherence tomography(vis-OCT),we demonstrated accurate and robust measurement of retinal oxygen metabolic rate(rMRO2)noninvasively in rat eyes.We continuously monitored the regulatory response of oxygen consumption to a progressive hypoxic challenge.We found that both oxygen delivery,and rMRO2 increased from the highly regulated retinal circulation(RC)under hypoxia,by 0.2860.08 μL min(^-1)(p,0.001),and 0.2060.04 μL min(^-1)(p,0.001)per 100 mmHg systemic pO2 reduction,respectively.The increased oxygen extraction compensated for the deficient oxygen supply from the poorly regulated choroidal circulation.Results from an oxygen diffusion model based on previous oxygen electrode measurements corroborated our in vivo observations.We believe that vis-OCT has the potential to reveal the fundamental role of oxygen metabolism in various retinal diseases. 展开更多
关键词 oxygen metabolism retinal circulation visible light optical coherence tomography
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Artificial neural-network-based visible light positioning algorithm with a diffuse optical channel 被引量:11
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作者 黄河清 杨爱英 +2 位作者 冯立辉 倪国强 郭芃 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第5期16-20,共5页
Visible light positioning becomes popular recently. However, its performance is degraded by the indoor diffuse optical channel. An artificial neural-network-based visible light positioning algorithm is proposed in thi... Visible light positioning becomes popular recently. However, its performance is degraded by the indoor diffuse optical channel. An artificial neural-network-based visible light positioning algorithm is proposed in this Letter, and a trained neural network is used to achieve positioning with a diffuse channel. Simulations are made to evaluate the proposed positioning algorithm. Results show that the average positioning error is reduced about 13 times, and the positioning time is reduced about two magnitudes. Moreover, the proposed algorithm is robust with a different field-of-view of the receiver and the refiectivity of the wall, which is suitable for various position- ing applications. 展开更多
关键词 view LEDS Artificial neural-network-based visible light positioning algorithm with a diffuse optical channel CDF RSS
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Visible light communication based on space-division multiple access optical beamforming
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作者 Sung-Man Kim Hyun-Jun Lee 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第12期9-12,共4页
We propose and demonstrate a visible light communication (VLC) scheme based on space-division multiple access (SDMA) optical beamforming to accommodate multiple user devices in the VLC based on optical beamforming... We propose and demonstrate a visible light communication (VLC) scheme based on space-division multiple access (SDMA) optical beamforming to accommodate multiple user devices in the VLC based on optical beamforming. SDMA optical bealnforming is a technique which separates light-emitting diode light spa- tially and focuses each part on different target devices simultaneously. We show the experimental results of the VLC signal amplitudes, the optical power densities, and the bit-error rate performance as a function of transmission distance before and after the SDMA optical beamforming. The results show that the VLC signal amplitudes and optical power densities are improved by 8-2 and 3.8- 5 dB, respectively, with the help of SDMA optical beamforming. 展开更多
关键词 VLC SDMA visible light communication based on space-division multiple access optical beamforming
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