Mass Flow Indicator for Metal Particles

Author:  Champaigne, J.M.
Source:  US Patent 4,523,146
Doc ID:  1985028
Year of Publication:  1985
Abstract:  
A method for determining the size of metal particles which includes the positioning of an inductive circuit within a particle flow path to establish an oscillatory signal, varying the signal frequency to determine at which amplitude a signal is substantially constant, and then recording changes in signal amplitude which correlate to changes in particle size.