Design Of Dust Concentration Measurement System Based On Android Platform

There are many ways in measurement of soot concentration at home andabroad, but generally can be grouped into two categories, one is based onsampling and the other is not need to sample. Due to the sampling methoddoes not have the characteristics of long-distance, online measurement,non-sampling measurement methods based on the photoelectric technology inrecent years has been a rapid development.Nowadays there are two methods used in optoelectronic technology ofnon-sampling measurement, including light transmission method and the lightscattering method. It is not accuracy when the dust concentration is low. Inorder to resolve the problem, in this paper, we study mainly the sootconcentration measurement based on light scattering method. Light scatteringmethod can compensate the disadvantage for the optical transmission methodin the measurement of low soot concentrations, and get a more accurate sootconcentration. In this paper, light scattering based on Mie scattering theory, isused to calculate the soot concentration in a certain scattering angle, and thevarious measurement methods are compared and analyzed.Finally, the article introduces the design of dust concentration measuringsystem, including the circuit part, the optical part, the software part of themeasuring system and study the light scattering theory and experiment. In thesignal acquisition and transmission system of dust concentration measuringsystem, it designs data acquisition and processing system based on51MCUand the Android open platform ARM11terminal equipment. Firstly it designsthe data acquisition based on MCU, and sends processing data from MCU withBluetooth, and then connect the terminal equipment by the Bluetooth pairing,and then terminal equipment receives the data to process and display. Thesystem test results show that: the basic realization of the design of dustconcentration measuring system based on handheld devices. The conclusionanalyzes and summarizes the current system design results, and follow-updirection of scientific research in the future.