Red-green-blue(RGB)beam combiners are widely used in scenarios such as augmented reality/virtual reality(AR/VR),laser projection,biochemical detection,and other fields.Optical waveguide combiners have attracted extens...Red-green-blue(RGB)beam combiners are widely used in scenarios such as augmented reality/virtual reality(AR/VR),laser projection,biochemical detection,and other fields.Optical waveguide combiners have attracted extensive attention due to their advantages of small size,high multiplexing efficiency,convenient mass production,and low cost.An RGB beam combiner based on directional couplers is designed,with a core-cladding relative refractive index difference of 0.75%.The RGB beam combiner is optimized from the perspective of parameter optimization.Using the beam propagation method(BPM),the relationship between the performance of the RGB beam combiner and individual parameters is studied,achieving preliminary optimization of the device’s performance.The key parameters of the RGB beam combiner are optimized using the entropy weight-technique for order preference by similarity to an ideal solution TOPSIS method,establishing the optimal parameter scheme and further improving the device’s performance indicators.The results show that after optimization,the multiplexing efficiencies for red,green,and blue lights,as well as the average multiplexing efficiency,reached 99.17%,99.76%,96.63%and 98.52%,respectively.The size of the RGB beam combiner is 4.768 mm×0.062 mm.展开更多
目的探讨头颈部白斑患者红绿蓝(red green blue,RGB)光和紫外线(ultraviolet,UV)光图像在白癜风诊断、治疗及疗效评价中的价值。方法应用皮肤分析仪对608例头颈部白斑患者进行RGB光和UV光拍照,定性分析同一患者头颈部白斑在RGB光和UV光...目的探讨头颈部白斑患者红绿蓝(red green blue,RGB)光和紫外线(ultraviolet,UV)光图像在白癜风诊断、治疗及疗效评价中的价值。方法应用皮肤分析仪对608例头颈部白斑患者进行RGB光和UV光拍照,定性分析同一患者头颈部白斑在RGB光和UV光下白癜风病变边界的区别。结果白癜风皮损在UV光下表现为界限清楚的亮白色荧光。608例头颈部白斑患者中,通过RGB和UV图像确诊为白癜风281例(46.2%),除外286例(47.0%),不能明确诊断41例(6.7%)。部分黏膜和头皮部位受累的白癜风因颜色浅,诊断困难,UV图像可明确诊断。肉眼不能明确白癜风皮损界限时,UV图像可明确受累范围,指导治疗。对于疗效的评价,UV图像可更有效地确定复色范围,并提示治疗后肉眼不可见皮损。结论头颈部白斑患者RGB和UV图像分析可用于诊断或除外白癜风,特别是肉眼难于鉴别的皮损;能有效地指导治疗和进行疗效评价,更有效地确定复色范围。展开更多
基金Project(52175445)supported by the National Natural Science Foundation of ChinaProject(2022JJ30743)supported by the Natural Science Foundation of Hunan Province,China+1 种基金Project(2023GK2024)supported by the Key Research and Development Program of Hunan Province,ChinaProject(2023ZZTS0391)supported by the Fundamental Research Funds for the Central Universities of China。
文摘Red-green-blue(RGB)beam combiners are widely used in scenarios such as augmented reality/virtual reality(AR/VR),laser projection,biochemical detection,and other fields.Optical waveguide combiners have attracted extensive attention due to their advantages of small size,high multiplexing efficiency,convenient mass production,and low cost.An RGB beam combiner based on directional couplers is designed,with a core-cladding relative refractive index difference of 0.75%.The RGB beam combiner is optimized from the perspective of parameter optimization.Using the beam propagation method(BPM),the relationship between the performance of the RGB beam combiner and individual parameters is studied,achieving preliminary optimization of the device’s performance.The key parameters of the RGB beam combiner are optimized using the entropy weight-technique for order preference by similarity to an ideal solution TOPSIS method,establishing the optimal parameter scheme and further improving the device’s performance indicators.The results show that after optimization,the multiplexing efficiencies for red,green,and blue lights,as well as the average multiplexing efficiency,reached 99.17%,99.76%,96.63%and 98.52%,respectively.The size of the RGB beam combiner is 4.768 mm×0.062 mm.
文摘目的探讨头颈部白斑患者红绿蓝(red green blue,RGB)光和紫外线(ultraviolet,UV)光图像在白癜风诊断、治疗及疗效评价中的价值。方法应用皮肤分析仪对608例头颈部白斑患者进行RGB光和UV光拍照,定性分析同一患者头颈部白斑在RGB光和UV光下白癜风病变边界的区别。结果白癜风皮损在UV光下表现为界限清楚的亮白色荧光。608例头颈部白斑患者中,通过RGB和UV图像确诊为白癜风281例(46.2%),除外286例(47.0%),不能明确诊断41例(6.7%)。部分黏膜和头皮部位受累的白癜风因颜色浅,诊断困难,UV图像可明确诊断。肉眼不能明确白癜风皮损界限时,UV图像可明确受累范围,指导治疗。对于疗效的评价,UV图像可更有效地确定复色范围,并提示治疗后肉眼不可见皮损。结论头颈部白斑患者RGB和UV图像分析可用于诊断或除外白癜风,特别是肉眼难于鉴别的皮损;能有效地指导治疗和进行疗效评价,更有效地确定复色范围。
