Affection of different size and depth of coal powder on pressure cell

Using the sensors to monitor the geo-hazards such as tailing pond is a useful way but the accuracy of measuring pressure is often inadequate.The pressure measurement with pressure cell can be affected by different factors such as temperature,surrounding material,stiffness and size of pressure cell.In all the factors the one from the material aspect is mostly obvious.This paper focuses on the affection of different mesh coal and depth on pressure cells.In the same mesh and same force outside,measured pressure has the inverse relationship with the depth and the response time of measured pressure would reduce with the growth of the depth(it needs time to be stable for the measured pressure);in the same depth and same force outside,measured pressure has direct proportion relationship with the mesh except large particles.In addition,the paper focuses on how arrangements of material and contact area affect the response time which is one index that reflects the performance of a sensor.