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Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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相关实验视频

Updated: May 12, 2026

Optical Frequency Domain Imaging of Ex vivo Pulmonary Resection Specimens: Obtaining One to One Image to Histopathology Correlation
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时间域全场光学连贯性断层扫描与数字失焦校正.

Austėja Trečiokaitė, Karolis Adomavičius, Egidijus Auksorius

    Optics letters
    |May 15, 2024
    PubMed
    概括

    时间域全场光学连贯断层扫描 (TD-FF-OCT) 中的数字失焦校正克服了散射介质中的图像退化. 这种技术可以弥补高达1毫米的失焦,提高生物医学应用中的成像深度.

    科学领域:

    • 生物医学光学 生物医学光学
    • 光学成像技术的成像
    • 连贯断层扫描是一致的断层扫描.

    背景情况:

    • 时间域全场光学连贯断层扫描 (TD-FF-OCT) 提供高分辨率的深层组织成像.
    • 像样本失焦等光学偏差限制了TD-FF-OCT的成像深度和质量.
    • 散射介质对当前的OCT技术构成重大挑战.

    研究的目的:

    • 为了证明在散射介质中的TD-FF-OCT中样本失焦的数字校正.
    • 调查数字失焦校正在广泛范围内的有效性.
    • 为了提高TD-FF-OCT可实现的成像深度和图像质量.

    主要方法:

    • 在干扰仪的样本和参考臂中匹配光学路径长度.
    • 实施数字信号处理以补偿失焦.
    • 在反射和散射样本上测试数字校正方法.

    主要成果:

    • 数字失焦校正成功地弥补了在高度散射介质中的样本失焦.
    • 该技术有效地纠正了高达1毫米的失焦.
    • 由于失焦导致的图像质量下降显著减轻.

    结论:

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    • 数字失焦校正是一种可行的方法来克服TD-FF-OCT的局限性.
    • 这种方法扩展了实际的成像深度,并在分散生物组织时提高了图像保真度.
    • 该技术对先进的生物医学成像应用具有前景.