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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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.
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SiPM-based LiDAR with multipulse sequence modulation and multithreshold signal processing.

Zhihao Liu, Yinong Zeng, Chong Li

    Optics Letters
    |October 15, 2024
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    Summary
    This summary is machine-generated.

    This study introduces a novel light detection and ranging (LiDAR) system using a silicon photomultiplier (SiPM) detector for rapid, low-noise daylight measurements. The system achieves a 100% success rate for ranging at 125m with high precision and speed.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Remote Sensing

    Background:

    • Daylight conditions present significant challenges for Light Detection and Ranging (LiDAR) systems due to extremely low signal-to-noise ratios (SNRs).
    • Traditional LiDAR systems often struggle with performance under such adverse conditions, limiting their practical applications.
    • Silicon Photomultiplier (SiPM) detectors offer potential for enhanced sensitivity in low-light detection.

    Purpose of the Study:

    • To propose and demonstrate a novel LiDAR system capable of rapid ranging under extremely low SNR daylight conditions.
    • To leverage SiPM detector technology for improved performance in challenging ambient light environments.
    • To provide a practical, cost-effective solution for high-speed, noise-resistant LiDAR applications.

    Main Methods:

    • Development of a LiDAR system utilizing a semiconductor laser to emit modulated laser pulses.
    • Integration of a Silicon Photomultiplier (SiPM) detector for signal reception.
    • Implementation of a dynamic multithreshold signal processing technique to analyze SiPM response signals.

    Main Results:

    • The proposed SiPM-based LiDAR system achieved a 100% success rate in continuous ranging of a low reflectivity target at 125 meters.
    • The system demonstrated a ranging precision of less than 20 cm.
    • The ranging time was recorded at less than 10 microseconds, indicating high-speed operation.

    Conclusions:

    • The developed SiPM-based LiDAR system offers a robust solution for high-speed, noise-resistant ranging in daylight.
    • The system's performance under extremely low SNR conditions validates its practical utility.
    • This technology serves as a significant reference for the development of miniaturized, low-cost, and efficient LiDAR systems.