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Standoff detection of biological agents using laser induced fluorescence—a comparison of 294 nm and 355 nm excitation wavelengths

机译:使用激光诱导的荧光进行生物剂的对峙检测-294 nm和355 nm激发波长的比较

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摘要

Standoff detection measuring the fluorescence spectra of seven different biological agents excited by 294 nm as well as 355 nm wavelength laser pulses has been undertaken. The biological warfare agent simulants were released in a semi-closed aerosol chamber at 210 m standoff distance and excited by light at either of the two wavelengths using the same instrument. Significant differences in several of the agents’ fluorescence response were seen at the two wavelengths. The anthrax simulants’ fluorescence responses were almost an order of magnitude stronger at the shorter wavelength excitation. However, most importantly, the fluorescence spectra were significantly more dissimilar at 294 nm than at 355 nm excitation with ~7 nm spectral resolution. This indicates that classification of the substances should be possible with a lower error rate for standoff detection using 294 nm rather than 355 nm excitation wavelength, or even better, utilizing both.
机译:已经进行了对峙检测,该检测测量了由294 nm以及355 nm波长的激光脉冲激发的七种不同生物制剂的荧光光谱。将生物战剂模拟物在相距210 m的半封闭气雾室中释放,并使用同一仪器在两个波长中的任何一个波长下激发光。在两种波长下,几种试剂的荧光反应存在显着差异。在较短的波长激发下,炭疽模拟物的荧光反应几乎增强了一个数量级。但是,最重要的是,在294 nm处的荧光光谱与在355 nm激发下具有〜7 nm光谱分辨率的荧光光谱相差很大。这表明对于使用294 nm而不是355 nm激发波长进行间隔检测的物质,应该能够以较低的错误率对物质进行分类,或者更好地利用这两种物质进行分类。

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