基于时间可编程频率梳的运动跟踪太赫兹时域光谱用于运动物体传感
Motion-Tracking Terahertz Time-Domain Spectroscopy Enabled by Time-Programmable Frequency Combs for Moving-Object Sensing
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中文总结 AI 辅助
本文提出基于时间可编程频率梳的运动跟踪太赫兹时域光谱，通过主动锁定测量窗口至移动波形，实现高速采集与位移跟踪，并成功分离呼吸和心跳信号。
中文摘要 AI 辅助
太赫兹时域光谱（THz-TDS）能够直接获取光谱信息和飞行时间特征，使其在动态传感领域具有吸引力。然而，传统的高速THz-TDS方法通常依赖于固定的延迟轨迹，限制了其在跟踪目标运动时仅选择性采集相关时间窗口的能力。在此，我们演示了基于时间可编程频率梳（TPFCs）的运动跟踪THz-TDS，其中太赫兹测量窗口被主动锁定到移动的时域波形上。通过连续调制一个TPFC的锁相设定点，我们以高达308 Hz的速率对以主太赫兹峰为中心的特定时间窗口进行实时切趾采集。同时，窗口内的残余峰位置被实时检测并反馈到另一个梳，使测量窗口能够跟随超过原始采集窗口的目标位移。反馈命令连同残余峰位置进一步实现了相对目标位移的重建。作为概念验证演示，我们使用移动的金镜模拟叠加在代表身体运动的更大位移上的呼吸和心跳相关运动，并成功地从测量位移中解析出这两个生命体征相关分量。这项工作将TPFC的任意延迟控制扩展到THz-TDS，并建立了一个用于同时位移跟踪和太赫兹波形采集的运动补偿光谱平台。
英文摘要
Terahertz time-domain spectroscopy (THz-TDS) provides direct access to both spectral information and time-of-flight features, making it attractive for dynamic sensing. However, conventional high-speed THz-TDS methods typically rely on a fixed delay trajectory, limiting their ability to selectively acquire only the relevant temporal window while tracking target motion. Here, we demonstrate motion-tracking THz-TDS based on time-programmable frequency combs (TPFCs), in which the THz measurement window is actively locked to a moving time-domain waveform. By continuously modulating the phase-lock set point of one TPFC, we perform real-time apodized acquisition of a specific temporal window centered on the main THz peak at rates up to 308 Hz. Simultaneously, the residual peak position within the window is detected in real time and fed back to the other comb, enabling the measurement window to follow target displacements exceeding the original acquisition window. The feedback command together with the residual peak position further enables reconstruction of the relative target displacement. As a proof-of-concept demonstration, we use a moving gold mirror to simulate respiration- and heartbeat-related motion superimposed on a much larger displacement representing body motion, and successfully resolve the two vital-sign-related components from the measured displacement. This work extends arbitrary-delay control with TPFCs to THz-TDS and establishes a motion-compensated spectroscopy platform for simultaneous displacement tracking and THz waveform acquisition.
发表机构
- Keio University（庆应义塾大学）
- Nihon University（日本大学）
机构由 AI 辅助整理，请以论文原文为准。
