Patent ID: 7890269
Filing Date: 2011-02-15
Classification: G01F,G01N

Abstract:
1. A method for measurement of the specific density of a medium, comprising: injecting a pulsed acoustic signal into the measured medium by a transmitting transducer; detecting the signal by a receiving transducer after passing through a measured path; determining automatically the acoustic impedance Z of the medium in an analytical device by comparison of the characteristic for the currently measured received signal with reference characteristics predetermined for various values of the acoustic impedance and stored so as to be associated with the respective values of the acoustic impedance, wherein the comparison is made in at least one temporal sub-domain of the characteristics; determining the propagation speed of the acoustic signal in the medium; and calculating the density of the medium as a quotient from the acoustic impedance Z and the propagation speed, wherein the comparison is based on a linear regression, and wherein the signal is digitally processed in the analytical device using a sampling rate which is between three and six times the resonance frequency of the transducers.