Method of processing an electrical signal

G - Physics – 01 – B

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349/41

G01B 17/02 (2006.01) A61B 8/08 (2006.01)

Patent

CA 2021509

METHOD OF PROCESSING AN ELECTRICAL SIGNAL ABSTRACT OF THE DISCLOSURE This method for measuring the distance e separating two faces (3, 4) of an object (1) employs the ultrasonic wave diffused back by said faces and received by a sensor (6). Following digitalization (11), the temporal signal is transformed (12) into a frequency spectrum . The modulus of the frequency spectrum is established (13) then the logarithmic derivative thereof is calculated (15) from whence there results a useful signal including a periodic signal onto which a linear signal is superposed. Following suppression (14, 161 of the linear signal the useful signal is applied (17) to a frequency window in order to eliminate the noise therefrom. The signal thus obtained is inversely transformed (18) to obtain a signal the amplitude of which is a function of the time and the envelope of this latter signal is determined (19). After having determined the temporal spread .DELTA.t separating the time origin from the envelope peak showing the greatest amplitude, the sought for distance e is calculated from the relation e = c?.DELTA.t/2, c representing the propagation velocity of the ultrasonic wave. The method may be employed for the non-invasive meas- urement of the thickness or diameter of an artery or indeed for the measurement of the thickness of thin layers.

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