Study Of Measurement On Dirty Concentration Based On Mie Scattering Theory

For the need of measurement on dirty concentration, there are many methods ,such as filtrating and weighing method, forecasting velocity of flow method, light attenuation method, light glittering method ,and so on. These methods all have defections. Filtrating and weighing method need got-up operation and it takes much time; structure of apparatus based on forecasting velocity of flow method is complex for collecting information such as temperature, gas pressure, velocity of flow; detection based on light attenuation method does not adapt to low thickness circumstance; linear theory about light glittering method only accords with circumstance where is not so much dirty.In the article, a specimen system based on background Mie scattering is built to detect dirty concentration. In contrast with traditional detecting method, the system can work in condition with various dirty concentration, also fit flue ranging from one meter to ten meters.The article firstly presents the virtues and defections of traditional dirty detection method. Then Mie theory is introduced and its specialties are studied. Furthermore linear relation between background Mie scattering signal and dirty concentration is obtained.According as the linear relation the specimen system is designed.the article designed many experiments to validate its performance.Firstly sensitivy and repetition are tested;then many data about deferent signal of specimen system and referenced concentration data are used to curve fitting.The result shows that deferent signal and dirty concentration data have nicer linear relation.In comparison with referenced concentration,the fitting result has lesser error.At last the system performance about zero drift and full range drift are tested to be outstanding.