PVDF線集束型超音波センサを用いた漏えいレーリー波・漏えいクリーピング波・表面SV波速度の測定

PVDF線集束型超音波センサを用いた漏えいレーリー波・漏えいクリーピング波・表面SV波速度の測定
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使用 PVDF 线聚焦超声波传感器测量泄漏瑞利波、泄漏爬行波和表面 SV 波速

DOI:
10.1299/kikaia.63.2444
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发表时间:
1997
期刊:
Transactions of the Japan Society of Mechanical Engineers. A
影响因子:
--
通讯作者:
剛志 佐藤
剛志 佐藤
中科院分区:
--
文献类型:
--
作者:
郁也 藤井;川嶋 紘一郎;剛志 佐藤

文献摘要

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提出了一种利用线聚焦PVDF超声换能器和数字信号处理技术精确测量泄漏瑞利波速度的方法。将聚偏氟乙烯(PVDF)薄膜粘接在凹面上,构成聚焦式PVDF超声换能器。测量系统由超声波脉冲发生器/接收器、高速数字波形存储器和个人计算机组成。测量熔融石英漏瑞利波速度的相对精度(标准偏差除以平均速度)为10-4。PVDF超声波换能器具有较宽的频带宽度,因此,泄漏爬行波和表面SV波被清楚地识别出来,并同时测量了这些波速。
A method of measuring leaky Rayleigh wave velocity precisely has been developed with a line-focused PVDF ultrasonic transducer and a digital signal processing. A focused PVDF ultrasonic transducer is constructed by cementing PVDF film on a concave surface. The measurement system is composed of an ultrasonic pulser/receiver, a high-speed digital wave memory and a personal computer. The relative precision of the measurement for the leaky Rayleigh wave velocity of fused silica, the standard deviation divided by the mean velocity, is 10-4. PVDF ultrasonic transducers have broad band width, therefore, leaky creeping wave and surface SV wave are clearly identified and these wave velocities have been measured simultaneously.