Design Of Aluminum Dust Concentration Detection System Based On Light Scattering Method

In the aluminum production process,the polishing workshop will have a lot of aluminum dust produced,aluminum dust not only affects the production operations,but also a great harm to the health of the staff,can cause aluminum pneumoconiosis,and when the aluminum dust concentration exceeds a certain limit and there is a fire,the aluminum dust will explode,a serious threat to the safety of production operations.Therefore,it is very important to carry out fast and accurate real-time detection of aluminum dust concentration in the polishing plant.However,the traditional filter weighing method for a long time and can not quickly detect in real time,with a lot of deficiencies.In this paper,the direction of light scattering detection of aluminum dust concentration and detection system design,The main contents include the following sections:First,Theoretical research.By introducing and analyzing the method of dust concentration detection at home and abroad,it is determined that the concentration of aluminum dust is detected by light scattering method.At the same time,the Mie scattering theory of single particles is discussed.Based on the equivalent spherical particle diameter theory,The relationship between the luminous flux and the concentration of the particles is deduced,and the linear relationship between them is obtained.The theoretical basis is laid for the design of the aluminum dust concentration detection device based on the light scattering method.Second,The hardware design of the inspection system.The hardware system includes optical system,signal conditioning system and embedded control system.The optical system of the light source,detectors,photosensitive area,optical path,sampling center angle was designed and selected,The IV conversion,amplification and filtering of the signal conditioning system And the design of the circuit is completed.The design of the optical system and the signal conditioning system is completed.Finally,the processor of the embedded system is selected and its peripheral circuit is designed including the alarm circuit,LCD Circuit,drive circuit,temperature sensor circuit.Third,Software Development and Implementation of Detection System.Based on the Android operating system prepared by the aluminum dust concentration detection system application software,the software can be realized temperature sensor and photoelectric sensor signal acquisition,and through the concentration conversion process to get the aluminum dust concentration value,the concentration limit will control the alarm.At the same time,the application also provides a graphical interface for the exchange of information with the user,the user can not only through the interface to view the relevant information on the concentration of aluminum dust can also be issued to the detection system a variety of instructions.Fourth,Experimental Study.Mainly completed the detection device temperature compensation and system calibration.The accuracy and reproducibility of the device are verified and analyzed.The experimental results show that the aluminum dust concentration detection system of this paper meets the requirements of the expected design.Finally,several performance indexes of the detection system are proposed,including the detection concentration range,the response time and so on,and the reason of the error is analyzed.