高时间分辨率的多普勒倍频太赫兹波干涉测速仪

IF 3.9 2区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Zhao-Hui Zhai;Chang-Lin Sun;Jiang Li;Liang-Hui Du;Shou-Xian Liu;Jiang-Bo Lei;Jun Jiang;Li-Guo Zhu
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引用次数: 0

摘要

由于太赫兹(THz)波能够穿透非极性不透明光学材料,使用太赫兹波的多普勒干涉测速仪可以测量不透明光学材料内部或后面的目标速度,例如高炸药内部的激波或爆震波。为了提高瞬态速度测量的时间分辨率,时频分析需要更短的时间窗。然而,太赫兹波的亚毫米波长意味着较短的时间窗口(例如,纳秒)导致极大的速度不确定性。为了解决这一挑战,提出了一种多普勒倍频太赫兹波多普勒测速仪(DFM-TDV)。通过多普勒频移的倍频,可以在相同的时间窗口下抑制速度不确定性,从而在保持相同水平的速度不确定性的同时允许更窄的时间窗口。讨论了DFM-TDV的设计和性能,并通过合成多普勒信号实验和爆轰驱动飞片实验对其性能进行了验证。速度不确定度和时间分辨率分别提高6.7倍和4倍,倍增系数为16倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Doppler Frequency-Multiplied Terahertz-Wave Doppler Interferometric Velocimeter With High Temporal Resolution
Due to the ability of terahertz (THz) waves to penetrate nonpolar opaque optical materials, Doppler interferometric velocimeters using THz waves can measure the velocity of a target inside or behind opaque optical materials, such as shock or detonation waves inside high explosives. To increase the temporal resolution of transient velocity measurements, a shorter time window is necessary during time–frequency analysis. However, the submillimeter wavelength of THz waves means that a shorter time window (e.g., nanoseconds) leads to extremely large velocity uncertainty. To address this challenge, a Doppler frequency-multiplied terahertz-wave Doppler velocimeter (DFM-TDV) was proposed. By frequency multiplication of the Doppler frequency shift, the velocity uncertainty can be suppressed under the same time window, allowing for a narrower time window while maintaining the same level of velocity uncertainty. The design and performance of the DFM-TDV were discussed, and its capability was tested through synthetic Doppler signal experiments and detonation-driven flyer experiments. The velocity uncertainty and temporal resolution of the measured velocity were improved by factors of 6.7 and 4, respectively, with a multiplication factor of 16.
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来源期刊
IEEE Transactions on Terahertz Science and Technology
IEEE Transactions on Terahertz Science and Technology ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS
CiteScore
7.10
自引率
9.40%
发文量
102
期刊介绍: IEEE Transactions on Terahertz Science and Technology focuses on original research on Terahertz theory, techniques, and applications as they relate to components, devices, circuits, and systems involving the generation, transmission, and detection of Terahertz waves.
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