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相关概念视频

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

771
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...
771

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 计量学 计量学 计量学
    • 激光物理 激光物理

    背景情况:

    • 双测距 (DCR) 提供高精度距离测量功能.
    • 基于非线性异步光学采样 (ASOPS) 的DCR适用于现场应用,因为相干性要求较宽松.
    • 传统的非线性频率转换在DCR中通常需要高激光功率.

    研究的目的:

    • 引入使用双色非线性ASOPS的低功耗双测距方法.
    • 为了利用周期聚合酸 (PPLN) 的高效类型-0相匹配,提高非线性频率转换.
    • 为了证明高精度的距离测量与减少激光功率.

    主要方法:

    • 采用双色非线性ASOPS方法,使用Er纤维激光器在1540nm和1580nm.
    • 使用周期极化酸 (PPLN) 晶体,通过类型-0相匹配有效生成总频率.
    • 使用780nm总频率信号进行了无背景飞行时间 (ToF) 测量.

    主要成果:

    • 实现了不到3微米的距离精度.
    • 证明了这种精度,采集时间短100 ms.
    • 仅需要5μW的反响激光功率.
    • 通过跟踪移动的翻译阶段来确认动态性能.

    结论:

    • 开发的DCR方法显著降低了高精度距离测量所需的激光功率.
    • 这种技术为需要精确距离的现场应用提供了实用和高效的解决方案.
    • 低功耗,高精度的性能为小型化和便携式测距系统开辟了可能性.