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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

772
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
772

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Updated: Jun 10, 2025

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基于SiPM的LiDAR具有多脉冲序列调制和多值信号处理.

Zhihao Liu, Yinong Zeng, Chong Li

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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光检测和测距 (LiDAR) 系统,使用光倍增器 (SiPM) 探测器进行快速,低噪音的日光测量. 该系统实现了100%的成功率,以高精度和速度在125m的距离范围内.

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    科学领域:

    • 光电学是指光电子产品.
    • 光子学 是一个光子学.
    • 遥感 遥感 遥感 遥感

    背景情况:

    • 日光条件对光检测和测距 (LiDAR) 系统构成重大挑战,原因是信号与噪声比 (SNR) 非常低.
    • 传统的LiDAR系统在这种不利条件下往往难以保持性能,从而限制了它们的实际应用.
    • 光倍增器 (SiPM) 探测器在低光检测中提供了提高灵敏度的潜力.

    研究的目的:

    • 提出和演示一种能够在极低SNR日光条件下快速射程的新型LiDAR系统.
    • 利用SiPM探测器技术,在具有挑战性的环境光环境中提高性能.
    • 为高速,耐噪声LiDAR应用提供实用,经济高效的解决方案.

    主要方法:

    • 开发一个利用半导体激光发射调制激光脉冲的LiDAR系统.
    • 集成一个光倍增器 (SiPM) 探测器用于信号接收.
    • 实施动态多值信号处理技术来分析SiPM响应信号.

    主要成果:

    • 拟议的基于SiPM的LiDAR系统在125米的低反射率目标的连续射程中实现了100%的成功率.
    • 该系统的测距精度低于20厘米.
    • 测距时间记录在不到10微秒,表明高速运行.

    结论:

    • 开发的基于SiPM的LiDAR系统为白天高速,耐噪声范围提供了强大的解决方案.
    • 在极低SNR条件下系统的性能验证了其实际实用性.
    • 这项技术为开发小型化,低成本和高效的LiDAR系统提供了重要的参考.