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Determining the light absorption distribution (LAD) of uterine tissue helps the detection of endometrial carcinoma. In this work, a 3-dimensional optical model of the human uterus is proposed and examined. The model is filled with strong scattering medium (undiluted raw and homogenized milk, URHM) or air at 630 nm and 800 nm wavelengths. Monte Carlo simulations are used to find

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The resolution and quality of the depth map captured by depth cameras are limited due to sensor hardware limitations, which becomes a roadblock for further computer vision applications. In order to solve this problem, we propose a new method to enhance low-resolution depth maps using high-resolution color images. The structural-aware term is intro-duced because of the availabil

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This paper designs an energy-quality multilevel framework for the coding and transmission of aerial images, and then introduces a scaling-based intra encoder with flexible sampling factor (SF) and quantization parameter (QP). By experimentally investigating how different coding configurations affect the complexity-rate-quality characteristics of aerial images, this paper derive

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In this paper, a new method for the rapid, economical and convenient detection of cyclic adenosine monophosphate (cAMP) in jujube is proposed and verified. Based on near-infrared (NIR) fiber spectroscopy combined with stoichio-metric analysis, the cAMP content in red jujube can be quickly detected. 68 red jujube samples were used for the NIR spectroscopy data acquisition and th

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In this paper, a novel vertical cavity surface emitting laser (VCSEL) polarization modulation technique based on po-larization switching due to thermal heating in a single transverse mode class 10 G VCSEL at 1 310 nm is demonstrated experimentally. The inherent orthogonal polarization switching of the VCSEL carrier with changing bias is exploited in the transmission of pulse-pe

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全息曝光系统中干涉条?#39057;?#31283;定性直接影响光栅掩模质量。研究了参考干涉条?#39057;?#29305;性, 提出一种光栅相位、倾斜?#32676;?#21608;期的检测方法。为提高光栅曝光系统的稳定性, 设计了一套全息光栅干涉条纹三维锁定系统。利用摄像机对参考干涉条纹进行检测, 利用微电机和压电陶瓷对光路进行微调, 可实现对光栅相位、倾斜?#32676;?#21608;期的有效控制。实验结果表明, 三维锁定系统可有效提高干涉条?#39057;?#31283;定性, 缩短光栅曝光前的静台稳定时

PDF全文 HTML全文 光学学报 | 2019,39(04):0405001
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依据稀薄随机分布冰晶粒子的激光散射特性, 当球形冰晶粒子分别服从指数、对数正态、Gamma三种不同分布时, 数?#23548;?#31639;并分析了0.65、1.31、1.55 μm激光入射下不同稀薄随机冰晶粒子层的微分散射截面随散射角的变化关系。结果表明: 入射激光波长的改变对冰晶粒子层的微分散射截面有?#27426;?#30340;影响; 当冰晶粒子服从指数分布时稀薄随机分布冰晶粒子层的微分散射截面最大, 要比其他两个分布大几个数量级; 不同激光波长和

PDF全文 红外与激光工程 | 2019,48(03):0311002
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针对红外复杂背景下的弱小目标检测难题, 提出一种基于背景自适应的多特征融?#31995;?#22797;杂背景下弱小目标的检测算法。首先, 通过对红外图像进行空域滤波去除孤立噪声点, 并利用恒虚警率分割消除大面积平稳背景, 获得疑似目标集。然后融合红外图像的背景信息、弱小运动目标的灰度特征、目标与周围像素的方向梯度特征等多个典型特征, 消除疑似目标集中的大部分假目标, 最后运用运动特征获取真实目标的轨迹, 最终实现复

PDF全文 红外与激光工程 | 2019,48(03):0326002
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在昼?#26500;?#27979;恒星测量恒星宽光谱成像信号强度的基础上, 首先通过MODTRAN软件结合系统参数、恒星光谱特征研究了宽光谱信标利用Langley法标定大气透过?#23454;?#26631;定误差, 据此通过标定恒星成像强度得到了整层大气宽光谱透过率; 然后, 利用大气模式研究了晴朗大气条件下宽光谱大气透过率与激光波段大气透过?#23454;?#20851;系, 进一步得到了532 nm和1 064 nm的整层大气透过率; 最后, 将白天时段观测恒星测量的大气透过率与太阳辐射

PDF全文 红外与激光工程 | 2019,48(03):0311001
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摘要

回顾了锁模光纤激光器中各种孤子动力学特性的研究状况,介绍了近年来基于色散傅里叶变换(DFT)技术的超快光纤激光器孤子瞬态动力学特性的研究进展,分析了同时利用时间透镜和DFT技术的超快现象多尺度探测,这些均有助于更全面地了解光孤子的物理本质。实时测量技术的发展必将极大地激发研究人员探索孤子动力学特性的热情,进一步促进孤子动力学特性研究?#32479;?#24555;激光技术的发展。

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