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用InGaAs/InP APD的红外单光子探测技术 总被引:1,自引:1,他引:1
由于在量子信息技术特别是量子密钥分配系统中的应用,以InGaAs/InP雪崩二极管为基础的红外单光子探测技术,近年来成为研究的热点之一。主要介绍了单光子探测用InGaAs/InP APD的选择和实现红外单光子探测器的关键技术:半导体制冷精密温控技术和APD的驱动控制技术,重点介绍了门控电路。 相似文献
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铀矿生物浸出过程中,浸矿微生物(氧化亚铁硫杆菌)对温度和液固比等环境因素较为敏感。基于铀矿生物浸出溶浸液中酸碱度、氧化还原电位(Eh)、铁离子浓度的变化和铀浸出率的差异,研究温度和液固比对南方某铀矿生物浸出的影响。结果表明,在温度为30 ℃和液固比为20的条件下,铀矿微生物浸出效果最佳,铀浸出率分别高达为96.15%和97.02%。因此,在生物浸出过程中,可以控制浸出体系温度和液固比,为浸矿细菌提供最适宜生长环境,以强化铀矿的生物浸出。研究结果为南方某铀矿工业生产提供重要参数和理论依据。 相似文献
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边缘是数字图像中的一个重要的局部特征。在复杂光照条件的情况下,图像分辨率较低,传统Sobel算子利用卷积计算出来的灰度梯度较为平缓,边缘不能有效的识别。通过改进Sobel算子的模板,平衡图像的亮边缘与暗边缘,尽可能地避免暗边缘信息的丢失。与此同时,通过分析数据建立相应的数学模型,优化子区域大小,把图像划分为多个子区域,在子区域内利用大津法进行边缘的检测与提取,最后使用Hilditch细化算法将图像的边缘提取出来。通过MATLAB仿真结果表明,与传统So bel算子的边缘提取算法相比,文中算法简单易实现,对于复杂光照条件下的图像,边缘信息提取更完整,自适应能力更强。 相似文献
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A plasmonic refractive index sensor based on metal-insulator-metal(MIM) waveguide-coupled structure is proposed and demonstrated in this paper.The physical mechanism of the device is deduced,and the finite difference time domain(FDTD) method is employed to simulate and study its index sensing characteristics.Both analytic and simulated results show that the resonant wavelength of the sensor has a linear relationship with the refractive index of material under sensing.Based on the relationship,the refractive index of the material can be obtained from the detection of the resonant wavelength.The results show that the sensitivity of the sensor can exceed 1600 nm/RIU,and it can be used in chemical and biological detections. 相似文献
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In this paper, a plasmonics refractive index sensor with the semiring-stub system coupled to a bus waveguide is proposed. The structure can achieve wavelength band tunable and ultra-sharp Fano resonance. The coupling mechanism between the bright mode and dark mode is investigated in detail, and apparent plasmon induced transparency (PIT) is realized on the resonance wavelength. The full width at half maximum (FWHM) of the resonant wavelength is modulated by adjusting the coupled distance. The sensitivity and figure of merit (FOM) of the proposed sensor can reach up to 600 nm/RIU and 120 on the visible region, respectively, and this performance can be helpful for designing the photonic integrated circuit and optical communication, in addition, it can be applied for bio-sensing. 相似文献
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