Ultrasonic assessment of Young's modulus in cast iron pipes

铸铁管在水和燃气分配系统中已经使用了近两个世纪。它们的退化导致**强度的损失；这就降低了网络的可靠性。目前的壁厚评估技术依赖于使用管道截面杨氏模量的精确值。我们已经开发了一种新的基于激光的系统，这使得它第一次能够真正看到和量化换能器和它们激发的材料中的超声波场。**这项创新技术可以显示超声波如何在管道中产生，传播和衰减；从而可以可靠地评估**弹性模量。本研究计划的主要目标是解决目前缺乏可靠的声学和超声波测试来评估管壁厚度的问题。我们将从问题的根源开始：**正确表征声学和超声波传感器。目前，波速（弹性模量）的计算实际上只使用典型超声波测试中记录的数千个数据点中的一个。因为超声波传感器对相同输入激励在不同频率下的响应不是恒定的。然而，真实的响应是开发可靠的超声波方法的基础。我们将评估使用激光技术的管道的真实反应，以开发新的技术，使加拿大工业更具竞争力。我们的解决方案将基于一个强大的分析，实验，**和数值程序。

Cast iron pipes have been used for almost two centuries in water and gas distribution systems. Their deterioration results in loss of**strength; which compromises the reliability of the network. The current technology for wall thickness evaluation relies on the use of**an accurate value of the Youngs modulus of the pipeline section. We have developed a novel laser-based system that makes it**possible, for the first time, to actually see and quantify the ultrasonic wave field in the transducers and the materials they excite.**This innovative technology can show how ultrasonic waves are generated, propagated, and attenuated in pipelines; so that the**elastic modulus can be reliably evaluated. The main goal of this research program is aimed at addressing the current lack of**reliability of acoustic and ultrasonic testing for the evaluation of the pipe wall thickness. We will start at the root of the problem:**proper characterization of the acoustic and ultrasonic sensors. Currently, wave velocity (elastic modulus) is computed using**practically only one data point out of thousands that are recorded in typical ultrasonic tests. Because the response of ultrasonic**sensors is not the constant for the same input excitation at different frequencies. However, the real responses are fundamental to**develop reliable ultrasonic methods. We will evaluate the real response of pipelines using laser technologies to develop new**techniques that will make the Canadian industry more competitive. Our solution will be based on a robust analytical, experimental,**and numerical programm.