Permanent corrosion monitoring using guided waves
Corrosion is one of the industries major issues. Currently inspections are conducted at regular intervals to ensure a sufficient integrity level of assets. Both economical and social requirements are pushing the industry to even higher levels of availability, reliability and safety of installations. The concept of predictive maintenance using permanent sensors that monitor the integrity of an installation is an interesting addition to the current method of periodic inspections. Coverage is obviously very important when it comes to permanent monitoring since the exact location of corrosion is difficult to predict. Sufficient coverage is required to achieve a certain level of reliability of a permanent monitoring system. The application of guided wave tomography is a very promising tool for permanent corrosion monitoring. This method is capable of determining the wall thickness of large areas with only a limited number of ultrasonic transducers. The wall thickness is determined between two transducer arrays, where each transducer in the transmit array is excited separately and all transducers in the receive array record the signals. These transducers excite specific guided wave modes that are highly dispersive, i.e., their wave speed depends on the wall thickness. Measuring the travel time requires dispersion correction and accurate time picking of the recorded signals. The measured travel times are then used in an inversion algorithm that inverts the measured travel times to a wall thickness map. Experimental results on pipes and plates show the potential of the method.
corrosion monitoring predictive maintenance guided wave tomography.
Arno VOLKER Arjan MAST
Joost BLOOM TNO Science and Industry Stieltjesweg 1, 2628 CK Delft, The Netherlands
国际会议
第十七届世界无损检测会议(17th World Conference on Nondestructive Testing)
上海
英文
865-872
2008-10-25（万方平台首次上网日期，不代表论文的发表时间）