Enabling standoff detection of hazardous materials using a fiber optic coupled quantum cascade infrared laser system
Enabling standoff detection of hazardous materials using a fiber optic coupled quantum cascade infrared laser system
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使用光纤耦合量子级联红外激光系统实现危险物质的远距离检测
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
C. Howle
中科院分区：
文献类型：
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作者：
K. Ewing;K. Major;J. Sanghera;R. Gattass;L. Shaw;L. Busse;D. Arnone;Enrique Lopez;M. Pushkarsky;J. Kane;R. Clewes;Linda Lee;C. Howle
全球防务界需要新的方法来检测化学、生物、辐射、核和爆炸物(CBRNE)威胁。这种对峙检测方法必须能够将目标危险材料与环境背景区分开来。因此，这些传感器必须表现出很高的选择性。可以使用红外(IR)光谱实现对CBRNE威胁的高选择性检测，红外光谱产生目标化学品的独特光谱“指纹”，从而能够将目标化学品与背景中的其他化学品区分开来。然而，使用红外光谱进行对峙检测需要在探测器处收集足够的入射光源，因此需要高功率光源。商业上可用的量子级联激光(QCL)源能够向距离源较远的目标投射高功率的相干激光。为了在整个指纹区域收集完整的红外光谱，多个QCL模块的输出被组合到单个出射孔径中。这通常是使用反射镜和其他光学器件来实现的，它们容易受到场系统中的振动和温度失调的影响。为了提供一种更坚固的解决方案来组合多个QCL模块的光束输出，我们开发了一种独特的硫系光纤合束器，它结合了四个商用QCL模块的输出。这允许在涵盖部分IR官能团和指纹区域的6.01-11.20μm光谱范围内进行扫描。我们展示了该QCL系统产生高质量危险材料红外光谱的能力。
The global defense community requires new approaches for standoff detection of chemical, biological, radiological, nuclear and explosive (CBRNE) threats. Such standoff detection methods must be capable of discriminating the target hazardous materials from the environmental background. Therefore these sensors must exhibit high selectivity. High selectivity detection of CBRNE threats can be accomplished using infrared (IR) spectroscopy, which produces a unique spectral “fingerprint” of the target chemical, enabling discrimination of the target chemical from other chemicals in the background. Standoff detection using IR spectroscopy however requires that enough of the incident source light may be collected at the detector; therefore a high-power source is needed. Commercially available quantum cascade laser (QCL) sources are capable of projecting high power, coherent laser light at targets down range from the source. In order to collect complete IR spectra throughout the entire fingerprint region, the output of multiple QCL modules are combined into a single exit aperture. This is typically achieved using mirrors and other optics which are susceptible to vibrational and temperature misalignments in field systems. In order to provide a more ruggedized solution to combining the beam output of multiple QCL modules, we developed a unique chalcogenide optical fiber beam combiner which combines the output of four commercial QCL modules. This allows for scanning across a spectral range from 6.01 – 11.20 μm encompassing parts of both the IR functional groups and fingerprint regions. We demonstrate the ability of this QCL system to generate high quality IR spectra of hazardous materials.