Optical Characteristics of Micro‐sized Biological Aerosol Particles

摘要

In this work, an ultraviolet C (UVC)‐light emitting diode (LED)‐based technology for hazardous biological particle detection was developed by analyzing the specific scattering and fluorescence signal characteristics of various particles generated by a 275 nm UVC excitation light source. An experimental apparatus based on laser‐induced fluorescence (LIF), comprising LED and PMT, was used. Experimental results for each type of particle studied showed that the ratio of scattering and fluorescence was 22–89% for micro‐sized clustered biological aerosol particles and 12% for non‐biological particles. It was confirmed that the presence of micro‐sized biological and non‐biological aerosol particles can be determined based on their fluorescence characteristics in the UV region. Hence, this study demonstrates the feasibility of hazardous biological particle detection in the UV region by using a LED‐based technology, which is both inexpensive and highly efficient.