为满足土力学研究与岩土工程对土体剪切波速高精度测试的要求,基于虚拟仪器技术研制了一种压电弯曲元波速测试系统。该系统硬件主要由弯曲元传感器、功率放大器、电荷放大器、计算机等组成;测试软件采用LabVIEW虚拟仪器平台开发,利用计算机声卡实现了信号的发生、采集功能。该系统构建成本低,测试效率高,已在砂土剪切波速测试中得到了应用。
In order to satisfy the demand of high precision of shear wave velocity measurement in soil mechanics and geotechnical engineering, a set of piezoelectric bender element system was developed based on virtual instrument technology. The system mainly consists of piezoelectric bender elements, power amplifier, charge amplifier,and computer, et al. The t software was programmed by LabVIEW, and the functions of signal generator and data acquisition were realized by the sound card. The system has the advantage of costeffective, and high measurement efficiency. It has been successfully applied to measure the shear wave velocity of sand.