Patent ID: 9714910
Date: 2017-07-25
CPC Classifications: G01N,G01R,G06Q

Claim:
1. Apparatus for separately detecting and measuring suspended particles in a molten metal, said measuring of said suspended particles having an associated predominant noise frequency range, said apparatus comprising: an electrically non-conductive barrier having opposed sides and having an orifice of predetermined hydrodynamic diameter, said barrier being suitable for immersion in a molten metal with said orifice below a surface of the metal; a device for moving molten metal through the orifice in a direction from one side of the barrier to the other; electrodes, suitable for immersion in said molten metal, positioned on opposite sides of said barrier for establishing a current path in the molten metal passing through said orifice; and a time varying excitation source for generating an AC current at a predetermined range of excitation frequency which is out of said predominant noise frequency range, said time varying excitation source connectable to said electrodes when said barrier and said electrodes are immersed in said molten metal to use said AC current to measure said suspended particles and generate an AC signal representative of said measurement of said suspended particles.