Novel intrumentation calculation methods to determine the phase-shift of ultrasound waves for non-destructive material characterization

16 pagesInternational audienceAn efficient method for material characterization consists in emitting ultrasound waves in a medium, and processing both the emitted and received signals to determine the morphological characteristics of the medium under test, wether static or under low flow. We present in this paper an instrumentation calculation method to determine the phase-shift of ultrasound waves at 40 kHz using a data acquisition card limited to 200 kHz. We describe the experimental platform, then the theoretical development for results exploitation, and two applications using the system : a distance measurement in air medium, and a speed sound measurement in sea-water/fresh water mixtur