Monitoring biological aerosols using UV fluorescence

被引:4
作者
Eversole, JD [1 ]
Roselle, D [1 ]
Seaver, ME [1 ]
机构
[1] USN, Res Lab, Washington, DC 20375 USA
来源
AIR MONITORING AND DETECTION OF CHEMICAL AND BIOLOGICAL AGENTS | 1999年 / 3533卷
关键词
bio-aerosols; UV fluorescence; particle monitoring;
D O I
10.1117/12.336868
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
An apparatus has been designed and constructed to continuously monitor the number density, size, and fluorescent emission of ambient aerosol particles. The application of fluorescence to biological particles suspended in the atmosphere requires laser excitation in the ultraviolet (UV) spectral region. In this study, a Nd:YAG laser is quadrupled to provide a 266nm wavelength to excite emission from single micrometer-sized particles in air. Fluorescent emission is used to continuously identify aerosol particles of biological origin. For calibration, biological samples of Bacillus subtilis spores and vegetative cells, Esherichia coli, Bacillus thuringiensis and Erwinia herbicola vegetative cells were prepared as suspensions in water and nebulized to produce aerosols. Detection of single aerosol particles, provides elastic scattering response as well as fluorescent emission in two spectral bands simultaneously. Our efforts have focuses on empirical characterization of the emission and scattering characteristics of various bacterial samples to determine the feasibility of optical discrimination between different cell types. Preliminary spsectroscopic evidence suggests that different samples can be distinguished as separate bio-aerosol groups. In addition to controlled sample results, we will also discuss the most recent results on the effectiveness of detecting outdoor releases and variations in environmental backgrounds.
引用
收藏
页码:34 / 42
页数:9
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