Patent ID: 6534964
Filing Date: 2003-03-18
Classification: G01N

Abstract:
An apparatus comprising:a transmitter transducer that generates an input waveform in a sample under test; a receiver transducer that receives the input waveform from the sample under test; an amplifier that amplifies the received input waveform to generate therefrom an amplified waveform; a digitizer that digitizes the amplified waveform to generate therefrom a digitized waveform; a digital signal processor that performs an auto-correlation function on the digitized waveform to produce a first resulting waveform and that performs a cepstrum analysis on the first resulting waveform to produce a second resulting waveform; a processing mechanism that determines time of flight from the second resulting waveform; a processing mechanism that determines velocity of the input waveform from the time of flight for the second resulting waveform; and a processing mechanism that determines from the velocity of the input waveform at least one property of the sample under test.