Patent ID: 6752003
Filing Date: 2004-06-22
Classification: G01N

Abstract:
A method for the extractive triboelectric measurement of dust and aerosols in streaming gases, comprising:branching off a partial gas stream from a dust-laden main gas stream; directing said partial gas stream through an intake cylinder into a tube-shaped triboelectrical measuring chamber equipped with sensors; moving the partial gas stream across the sensors, thereby causing the dust and aerosol particles contained in the latter to be rubbed against said sensors whereby an electrical charge exchange is generated; directing the partial gas stream through an outlet exit from the triboelectrical measuring chamber; and before the partial gas stream enters the triboelectrical measuring chamber, evaporating a full range of aerosols by increasing the temperature of the partial gas stream in such a way that nothing other than dust particles are detected, and decreasing the temperature of the partial gas stream to a level at which no aerosols are evaporated any more, and ascertaining the aerosol concentration from a difference between signals read out for â€œdust aloneâ€  and for â€œaerosols plus dustâ€ .