29 April 2016 Optical instrumentation systems for environmental and structural health monitoring based on the molecular condensation nuclei (MCN) detector
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Abstract
The foundation of measurement systems for environmental and structural health monitoring based on molecular condensation nuclei (MCN) detector is the measurement of the intensity of light scattered by aerosol particles. Aerosol particles are formed in the condensation chamber around single molecules of detected impurities (harmful and dangerous substances in the case of environmental monitoring and biomarkers in the case of structural health monitoring). The size of an aerosol particle is about 106 times larger than the size of the original impurity molecule. The ability of the aerosol particle to scatter incident light also increases ~1014÷1016 times compared with the original molecule. By measuring the light scattering intensity the concentration of chemical impurities in the air is determined. The paper investigates many aspects of the detection process - the optical scattering by aerosol particles inside the photometer of MCN detector; signal conditioning, processing of light scattering measurements results, determination of the criteria for making a decision about the presence of detected impurities in the environment; multi-component sensing of detected impurities and graphical user interface design. Experimental results of the detection of toxic substances in micro-concentrations in the environment are presented.
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Vladimir D. Kuptsov, Vladimir D. Kuptsov, Vadim Ya. Katelevsky, Vadim Ya. Katelevsky, Vladimir P. Valyukhov, Vladimir P. Valyukhov, Andrei V. Aladov, Andrei V. Aladov, "Optical instrumentation systems for environmental and structural health monitoring based on the molecular condensation nuclei (MCN) detector", Proc. SPIE 9899, Optical Sensing and Detection IV, 98991X (29 April 2016); doi: 10.1117/12.2224469; https://doi.org/10.1117/12.2224469
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