固体中の超音波パルス伝ぱ時間を求める各種ディジタル測定法の比較

概要

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A digital measurement system for the time-of-flight of ultrasonic longitudinal and transverse waves is constructed in terms of a conventional pulser/receiver, a transducer and a high-speed digital wave memory for material characterization and acoustoelastic stress measurement of solid materials with weak dispersion. Three methods, zero-crossing, cross-correlation and phase spectral methods, are compared from the viewpoint of precision for the time-of-flight measurement. The measurements of aluminum (10 mm in thickness) and acrylic (5 mm) plates have shown that the precision (2σ) of the time-of-flight is estimated to be less than 0.01 ns by the cross-correlation methods, which corresponds to the relative velocity variation of 2×10^<-6> for the longitudinal velocity of the aluminum plate. The cross-correlation method is found to have the highest stability.
一般社団法人日本機械学会の論文
1993-11-25