Design And Calibration Of DOP Aerosol Model Detector

HEPA (High Efficiency Particulate Air filter) is used in many industries Eg air purification and environmental monitoring.if the installation of HEPA defects, such as HEPA has a small hole or has a seam because of installation lax,and influence purifying effect. HEPA's role is very outstanding for the field have hazardous to your healthy. So seaching HEPA must on time and preventing the occurrence of harm.The method of seaching HEPA has a great many. My experimental subject study DOP detecting methods.This detecting methods are seaching man made DOP aerosol at before and after the filter filter concentration ratio. According to the ratio to determine the high-efficiency filter through rate. The present research purpose only Chinese radiation protection institute Ma Ying researchers report related done. The experimental subject that is done in the basis of experimental group experiments, focusing on the calibration theoretical analysis and research on the part of the circuit. For the preparation of aerosol detector DOP later made adequate preparation.Experimental group had do a lot for designing DOP aerosol testing. Determine the prototype use near-forward light scattering method,and according to this principle designed optical chamber. Preliminary measurement DOP aerosol before and after the filter filter concentration ratio,and verify the feasibility of the experiment. In this foundation,we infer near-forward light scattering calibration, and draws up the calibration scheme. Design the circuit section from the first light signals to the fina quality of concentration.The experiment of the innovation is:The white LED was selected as light source. Compared with a Halogen lamp it has many advantages such as easy modulation, low cost, small size, low power, fast response, easy warm-up, long lifetime, good shock resistant feature and so on. The experiments proved this design was feasible. The unique electrical signal processing module has a lock-in amplifier that can remove noise signal and restrain zero shift, which significantly enhances the measurement sensitivity.For prototype calibration and circuit design are almost theory analysis. Feasibility and error need validation and improve in the experiment.