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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Updated: Sep 11, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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不同的伪随机相位调制的连续波连贯LiDAR.

Yanan Zhi, Jinkai Wang, Yujiao Sun

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    概括
    此摘要是机器生成的。

    这项研究引入了一种新的LiDAR系统,用于精确的远程目标测距. 它克服了动态测量的挑战,使快速移动的物体能够准确地跟踪.

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    Differential Imaging of Biological Structures with Doubly-resonant Coherent Anti-stokes Raman Scattering CARS
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    Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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    相关实验视频

    Last Updated: Sep 11, 2025

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    科学领域:

    • 光电学是指光电子产品.
    • 遥感 遥感 遥感 遥感
    • 计量学 计量学 计量学

    背景情况:

    • 精确测距动态远程目标对于各种应用至关重要.
    • 现有的连贯LiDAR系统面临多普勒频率转移,连贯长度和相位噪声的挑战.
    • 需要新的架构来克服高精度测量的这些限制.

    研究的目的:

    • 为了呈现一个差异性的伪随机相位调制连续波 (DPR-PMCW) 连贯的LiDAR系统.
    • 为了实现动态远程目标的高精度测距.
    • 为了解决多普勒频率转移干扰,连贯长度限制和随机相位噪声积累.

    主要方法:

    • 使用微分伪随机二进制序列 (PRBS) 进行电光相调制 (EOPM).
    • 实现了一种新型的自我引用的干涉计接收器,配备了一个自由空间不平等臂长的马赫-泽恩德干涉计 (UAL-MZI) 和90°光学混合器.
    • 采用匹配的过算法来处理信号,并通过1位延迟自我干扰实现了正方形连贯检测.

    主要成果:

    • 在模拟到数字转换 (ADC) 后实现了毫米级的距离精度.
    • 证明了对波面扭曲的固有免疫力和对随机相位噪声 (RPN) 的有效抑制.
    • 在没有主动频率跟踪的情况下,展示了多普勒频率转移 (DFS) 的被动补偿.

    结论:

    • DPR-PMCW连贯的LiDAR系统成功地解决了动态目标距离的关键挑战.
    • 实验验证证了远程非合作目标的实时,高精度计量.
    • 该系统为快速移动的目标实时高精度测距提供了一种可行的方法.