METHOD AND MEANS OF DETECTING SOLID PARTICLES IN A FLUID FLOWING THROUGH A CONDUIT

摘要

K 5768 A method of detecting solid particles in a fluid flowing through a conduit, comprising the steps of generating an electric signal by allowing particles to impinge against an acoustic transducer means, filtering said signal to pass frequency components thereof in a range that is within the frequency band of about 50 kiloherz to about 500 kiloherz, comparing the values of the amplitudes of each pulse train in the filtered signal with at least one predetermined range of values, creating an electric standard pulse when the maximum amplitude of such pulse train has a value that is within said predetermined range, and counting the number of standard pulses over a predetermined period.