Powder density-measuring device and automatic powder spray amount control system using the same

摘要

A powder concentration measuring apparatus comprising a pair of purge gas introducing paths being provided across a material measuring path which introduces a powder material pneumatically transported, a pair of transparent windows being provided so that said material measuring path is viewable through said pair of purge gas introducing paths at the one of the transparent windows, and the light receiving device being provided at the other of the transparent windows, and a powder concentration operation and control means, wherein the control means calculates a powder concentration depending on the light amount received by the light receiving device when a light beam is projected into the material measuring path from the light projecting device.