Method of measuring distance using ultrasonic waves

Details Method of measuring distance using ultrasonic waves Method of measuring distance using ultrasonic waves

1990-07-19

1993-03-23

Lall, Parshotam S.

Boots, shoes, and leggings

36441325, 73602, G01B 1700, G06F 1542

Patent

active

051970198

ABSTRACT:
A 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, 16) 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 distance e is calculated from the relation e=c.multidot..DELTA.t/2, c representing the propagation velocity of the ultrasonic wave. The method may be employed for the non-invasive measurement of the thickness or diameter of an artery or indeed for the measurement of the thickness of thin layers.

REFERENCES:
patent: 4049954 (1977-09-01), Da Costa Vieira
patent: 4063549 (1977-12-01), Beretsky
patent: 4534220 (1985-08-01), Kleeper
patent: 4648276 (1987-03-01), Klepper
patent: 4799177 (1989-01-01), Sarr
patent: 4817432 (1989-04-01), Wallace et al.
patent: 4855911 (1989-08-01), Lele et al.
patent: 4926870 (1990-05-01), Brandenburger
patent: 5000183 (1991-03-01), Bonnefous
patent: 5038615 (1991-08-01), Trulson et al.
patent: 5050226 (1991-09-01), Collet-Billon
Ultrasonic Imaging 6, 435-451 (1984); Range Resolution Improvement by a Fast Deconvolution Method; G. Demoment.
Measurement of the Thickness of Thin Layers by Ultrasonic Interferometry M. Houze; Jul. 19, 1983; pp. 194-198.
Digital Signal Processing Method for Multilayered Media Thickness Measurement C. Delebarre; 1988 Ultrasonics Symposium pp. 1027-1029.

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