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首页> 外文会议>Detection and sensing of mines, explosive objects, and obscured targets XVI >Detection and identification of explosives hidden under barrier materials: what are the THz-technology challenges? Detection and identification of explosives hidden under barrier materials: what are the THz-technology challenges? Dete
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Detection and identification of explosives hidden under barrier materials: what are the THz-technology challenges? Detection and identification of explosives hidden under barrier materials: what are the THz-technology challenges? Dete

机译：检测和识别隐藏在屏障材料下的炸药​​：太赫兹技术面临哪些挑战？ r n r n r n检测和识别隐藏在屏障材料下的爆炸物：太赫兹技术面临哪些挑战？ r n r nDete

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摘要

We describe experiments where different explosives were hidden under common barrier materials, and THz radiation was used to detect and identify these explosives. Our THz system, a time-domain spectroscopy (TDS) system, is based on a femtosecond laser whose radiation is converted into THz radiation by a low-temperature grown GaAs photoconductive switch. A similar switch detects the reflected signal. The advantage of using a TDS system is that pulses reflected from the barrier and the actual explosive, arrive at different instances at the detector. This simplifies the separation of the barrier signature from the explosive signature, compared to a frequency domain system. However, partial temporal overlap between the two pulses makes it challenging to completely separate the spectral characteristics of the explosive from the characteristics of the barrier. Also, in addition to attenuating the THz-pulses, transmission through barrier materials may add spectral features to the reflected signal, hampering recognition of the explosive. On top of that, the explosive may have a rough surface, which reduces the strength of the reflected signal. In this contribution we shall address these issues and discuss strategies that may be used to face these challenges.
机译：我们描述了在普通的屏障材料下隐藏不同爆炸物的实验，并使用太赫兹辐射来检测和识别这些爆炸物。我们的THz系统是时域光谱（TDS）系统，它基于飞秒激光，其飞秒激光通过低温生长的GaAs光电导开关转换为THz辐射。类似的开关可检测反射信号。使用TDS系统的优点是，从屏障和实际炸药反射的脉冲到达检测器的不同位置。与频域系统相比，这简化了屏障特征与爆炸特征的分离。然而，两个脉冲之间的部分时间重叠使得将炸药的光谱特征与屏障的特征完全分开具有挑战性。另外，除了衰减太赫兹脉冲外，通过势垒材料的传输可能还会在反射信号上增加频谱特征，从而阻碍了炸药的识别。最重要的是，炸药可能具有粗糙的表面，从而降低了反射信号的强度。在本文中，我们将解决这些问题并讨论可用于应对这些挑战的策略。

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