Department of Civil and Environmental Engineering, Northeastern University, Boston, MA 02115, USA.
Sensors (Basel). 2013 May 8;13(5):5881-96. doi: 10.3390/s130505881.
Surface waves are commonly used for vibration-based nondestructive testing for infrastructure. Spectral Analysis of Surface Waves (SASW) has been used to detect subsurface properties for geologic inspections. Recently, efforts were made to scale down these subsurface detection approaches to see how they perform on small-scale structures such as concrete slabs and pavements. Additional efforts have been made to replace the traditional surface-mounted transducers with non-contact acoustic transducers. Though some success has been achieved, most of these new approaches are inefficient because they require point-to-point measurements or off-line signal analysis. This article introduces a Mobile Acoustic Subsurface Sensing system as MASS, which is an improved surface wave based implementation for measuring the subsurface profile of roadways. The compact MASS system is a 3-wheeled cart outfitted with an electromagnetic impact source, distance register, non-contact acoustic sensors and data acquisition/ processing equipment. The key advantage of the MASS system is the capability to collect measurements continuously at walking speed in an automatic way. The fast scan and real-time analysis advantages are based upon the non-contact acoustic sensing and fast air-coupled surface wave analysis program. This integration of hardware and software makes the MASS system an efficient mobile prototype for the field test.
表面波常用于基础设施的基于振动的无损检测。表面波谱分析 (SASW) 已被用于地质检测中探测地下特性。最近，人们努力将这些地下探测方法小型化，以观察它们在混凝土板和路面等小型结构上的性能。此外，还努力用非接触式声学换能器替代传统的表面安装式换能器。尽管取得了一些成功，但这些新方法大多效率低下，因为它们需要点对点测量或离线信号分析。本文介绍了一种移动声学地下传感系统 (MASS)，它是一种改进的基于表面波的实现，用于测量道路的地下剖面。紧凑的 MASS 系统是一个配备电磁冲击源、距离寄存器、非接触式声学传感器和数据采集/处理设备的三轮推车。MASS 系统的主要优势是能够以自动方式以步行速度连续采集测量数据。快速扫描和实时分析的优势基于非接触式声学传感和快速空气耦合表面波分析程序。这种硬件和软件的集成使 MASS 系统成为现场测试的高效移动原型。
