Ultrasonic assessment of Young's modulus in cast iron pipes

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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.