Patent ID: 6752018
Filing Date: 2004-06-22
Classification: G01N

Abstract:
A method for characterizing an acoustic impedance of an engineering component acoustically coupled to an acoustic waveguide, said method comprising:disposing a pressure measurement apparatus to measure pressure at one of a plurality of predetermined locations along said acoustic waveguide; exciting said acoustic waveguide with an excitation signal; incorporating a pressure signal from said pressure measurement apparatus into a pressure signal set; performing said steps of disposing, exciting, and incorporating using said pressure measurement apparatus and said excitation signal at each other one of said plurality of predetermined locations; transforming said pressure signal set to a frequency domain set; identifying a plurality of wave shape parameters from said frequency domain set; and computing from said frequency domain set a statistical measure for said wave shape parameters, said statistical measure being selected from the group consisting of residual variance, correlation coefficient, F-statistic, p-statistic, and confidence interval and wherein an acoustic impedance is computed.