G - Physics – 01 – N
Patent
G - Physics
01
N
349/35
G01N 29/00 (2006.01) G01N 25/72 (2006.01) G01N 29/11 (2006.01)
Patent
CA 1226662
ABSTRACT OF THE DISCLOSURE: A method which determines at least one property of a material by measuring the ultrasonic absorption in this material. In carrying out this method, the material is subjected to an ultrasonic wave having an intensity varying in time. Such a method can be performed by measuring a temperature modulation, produced by absorp- tion of the ultrasonic wave in a probed region of the material, at a surface area corresponding to this probed region, by measuring the ultrasonic power over the probed region, and by calculating the ultrasonic absorption in this probed region from the measured surface temperature modulation and the measured ultrasonic power for the pur- pose of determining at least one property of the material. Of course, the calculated ultrasonic absorption is repre- sentative of this material property. The method can also be carried out by subjecting the material to an external cause for varying its ultrasonic absorption, by measuring a relative variation, due to the external cause, of the temperature modulation at a surface area of the material corresponding to a region of this material subjected to the ultrasonic wave, and by measuring a variation of attenuation of the ultrasonic wave in the material due to the external cause. Thereafter, the ultrasonic absorp- tion in the material is calculated from the measured relative variation of the temperature modulation and from the measured attenuation in order to determine at least one property of the material.
472594
National Research Council Of Canada
Robic Robic & Associes/associates
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