气溶胶浓度分布平面探测系统的仿真分析

Simulation Analysis of the Plane Detection System for Distribution of Aerosol Concentration

为了实现气溶胶分布的成像探测,根据平面激光诱导荧光技术的基本原理,对气溶胶浓度分布平面探测系统单个像元的探测能力进行了理论分析.以荧光素作为目标粒子,对波长为450 nm的连续激光在探测平面内的分布和衰减变化进行了计算,并根据波长范围为500~600 nm的荧光信号和sCMOS相机单个像元输出信号的信噪比公式,分析了不同系统参数变化对单个像元可探测最低粒子数的影响,以及在探测平面内的分布差异,从而了解不同系统参数对气溶胶平面成像探测准确度的影响规律,为研究气溶胶分布的平面探测提供有效方法和理论参考.

To realize imaging detection of aerosol distribution,a plane detection system was proposed based on planar laser-induced fluorescence(PLIF)technology for distribution of aerosol concentration.Firstly,the single pixel detection ability of this plane detection system was analyzed theoretically.And then,taking fluorescein as the target particle,the power distribution and attenuation changes of planar laser at wavelength 450 nm were calculated.Finally,according to fluorescence signal in the wavelength range of 500~600 nm and SNR formula of the single pixel of the sCMOS camera,the influence of different system parameters on the detectable particle minimum number of single pixel and their distribution differences in the detection plane were discussed.The results show that the simulation analysis can help to understand the influence of different parameters on the performance of imaging detection of aerosol distribution,and provide an effective method and theoretical basis for plane detection of aerosol distribution.