スペクトル解析を用いた経年劣化損傷材の超音波減衰率測定の高精度化

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  • Improvement of measuring accuracy of ultrasonic attenuation of degraded materials using spectrum analysis.
  • スペクトル カイセキ オ モチイタ ケイネン レッカ ソンショウザイ ノ チョ

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A new algorithm for the improvement of measuring accuracy of ultrasonic attenuation using a spectrum analysis has been developed. Normally, the ultrasonic attenuation is evaluated from 1st and 2nd peak values of the pulse-echo ultrasonic wave. However, the attenuation values evaluated by this method possibly contain some error, because those values are greatly affected by the superimposed noise. The proposed method removes this problem by evaluating the attenuation values from the expected envelope curve of the original ultrasonic wave. The algorithm developed is incorporated in, measuring system which consists of a personal computer with ultrasonic apparatus and a digital storage oscilloscope. Several ultrasonic waves obtained from Monte Carlo simulations and high-temperature fatigue-damaged specimens are analyzed by using both the proposed method and the normal method. It is concluded that the measuring accuracy of ultrasonic attenuation by the present method is higher than that by the normal method.

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