Patent ID: 6493418
Filing Date: 2002-12-10
Classification: G01N

Abstract:
A method for the high precision measurement of a mass of material comprising the steps of:installing multiple gamma radiation sources with corresponding gamma ray detectors and between them installing a material conveying device; measuring the gamma ray detector's output voltage U0 corresponding to situations when no mass of material is present and output voltage Ui corresponding to situations when a mass of material is present and inputting the measured U0 and Ui values into a DPU connected to the gamma ray detector; measuring the conveying devices moving speed Vi using a high speed detector and inputting the measured value Vi into the DPU; calculating the accumulative mass material weight W conveyed in a period of time with the DPU using the formula: W=&Sum;i=1n&it;KLn&it;(Ui/U0)&it;Viwherein the mass material's rated coefficient K is corrected by the DPU.