The mathematic model is set up by using physics image analysis, the expression of aerosol concentration field in limited space is derived, and the correspondent numerical analysis is .
采用物理图像分析，建立简单的数学模型，求解并获得了有限空间气溶胶浓度场函数表达式，并进行相应的数值分析。
Finally, it can be proved that the model can be used in the field of aerosol measurement by using signal counting method with the sampled concentration is limited from 0 to 5 milligram.
理论上证明了，该模型能够适用于0 - 5 mg浓度条件下的信号计数法颗粒测量领域中。
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