Design and Implementation of Air pollution measuring Portable Device of Wheat Crop Threashing

摘要

The main objective is to design and implementation of Air pollution measuring portable device to measure air pollution in term of Pollution Performance Index (PPI) gh(w The device consists of straw collecting mechanism and a sensation system (SS). The device prototype has Abeen implemented and calibrated at Aa workshop in Agriculture Engineering Research Institute (AEnRI), and Aa local workshop in Giza Governorates. It was tested in the term at wheat season 2008/2009 to measure the air pollution resulted from wheat threshing operations. Many experiments were carried out and data was collected at different distances from the threshing machines to cover an area of 140 x 80 m and at heights which changed from ground surface 0.75, 2.0, 2.5 and 3.0 m. The experimental results showed that the weight of suspended straw decreases as the distance from the machine increases. Finally it can be concluded that the proposed portable device achieves its function property. One of the main advantageous futures isthe ability of using the proposed portable instrument to measure pollution at different heights. Many experiments were run in the laboratory and field to calibrate the new design instrument. The results from laboratory calibration found the relationshipbetween the weight on spring steel sensor (gm) (a gram is abbreviated as g, not gm) and Read of spring steel sensor by using Aa PCD device (micro-strain) gm= Micro-strain 60 Computer Program was used to analyze data to found the relation between the pollution particles absorbed by the filter (Wf), the weight of pollution particles fall on sensor (Ws), the distance between farm machine and the instrument (d). and the height of the instrument (h) then found total pollution (Wt). The obtained generalregression equation (the instrument software) swas W_f =1.9 -0.05 h + 0.002 d + 3.462 W_s, R~2=0.96