共振分散・逆円錐型圧電素子と円錐型バッキングによる高感度・広帯域AE変換子の開発

概要

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This paper reports some experimental results on a concave piezoelectric element, conical backing and first amplifier for high-sensitivity and wide-band AE transducer. The piezoelectric element, conceived according to a "resonance dispersion" design was fabricated based on piezoelectric ceramics/polymer 1-3 connectivity composites by Newnham. To control ringing characteristics, the backing was conical in shape. The first amplifier was inserted in a FET zero-bias amplifier in a cable connector. The AE transducer had half sensitivity and a wider resonance frequency (100 kHz-1.9 MHz) than a conventional type AE transducer (resonance frequency; 180 kHz). The residual noise was 20 μVp-p (10 kHz-50 MHz) at first stage amplifier, the measurement of hold level was able to reduce the noise to 10 μV with a wide frequency. Using this AE transducer, AE measurement with a high-sensitivity and wide-band was realized in material testings.
1998-11-01