The Mass Distribution Information Model And Application For Aerosol Counting

Aerosol scattering counting method has been widely used in the cleaning field due to fast, high precision, good repetition and suitable for on-line measurement. However, due to the theory model of aerosol mass measurement by using counting method hasn't been strictly founded on the measure statistics, the fractal character of irregular particles can't be opened out up to now, which leads to the inverse calculation model of mass is incomplete. Aiming at this problem, information idea and theory will be introduced to the field of aerosol mass measurement by using counting method in this paper. Then, the fractal measurement characteristic decided by the irregular shape character of aerosol will be studied. At the same time, the theory model also will be established which uses the counting signal relative amplitudes to calculate the equivalent mass of aerosol mass subset.The conception of mass subset is proposed for aerosol firstly in this paper. And it has been extended to the equivalent mass, which is used to substitute the equivalent diameter and as the basic parameter of irregular particles. According to statistical character of measurement, information idea and theory are used to analyze the physical measuring process. And then, the connotations of information concept in measuring information theory are discussed. Meanwhile, the new viewpoint that information is the measurement of structure and the detailed degree of structure description for statistical expressional form is proposed. Besides, information idea and theory are also used to research the structure character of aerosols' mass and amplitude distributions of signal counting in the process of aerosol measurement. In further, the conception of the equivalent mass corresponding to counting signals channel is also proposed. Based on these, the essential principle is founded for aerosol mass measurement by using counting method. As a matter of fact, combining this new measuring principle with statistics, the fractal measurement model of aerosol's equivalent volume for counting signal is established under the condition of the same density. In conclusion, this model gives the cause of formation of fractal character in the field of aerosol mass measurement.Afterward, the aerosol mass measurement sensor with light scattering counting method is used as an example, and combining with the nonuniformity of light intensity in sensitive volumes, the general function (?) of average mass and characteristicparameter of counting channels is obtained. In fact, the indexαis the fractal dimension of equivalent scattering section which includes the information of the aerosols' mass and space distributions in the sensitive volumes. 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. In a word, the elemental measure theory of aerosol mass measurement is resolved by using multi-channel counting method. Especially, this work will guide the particle counter's development toward the high level and performance.