Guided waves for NDT and permanently-installed monitoring

$25.00 plus tax (Refund Policy)

Buy Article:

Abstract:

There is a gradual shift in emphasis from periodic inspection with detachable transducers (NDT) to permanently-installed monitoring systems giving information about the structural integrity at pre-programmed intervals or on demand (SHM). The drivers of this change are discussed, together with the requirements of successful SHM systems. Particular issues are that NDT often involves scanning and this is not possible with typical SHM configurations; it therefore becomes important to cover a significant area of a structure from each transducer position. Guided waves provide a possible solution to this problem and permanently-installed guided wave pipe inspection systems are now available. The sensitivity obtained with a permanently-installed system is significantly better than that in a one-off test as baseline subtraction can be employed. However, this is far from trivial as it is necessary to compensate for benign changes such as temperature. The guided wave technique does not provide accurate remaining thickness information and is best complemented by point measurements at selected locations. Another issue is that the SHM transducers must survive in operational conditions, which is particularly difficult at high temperatures. Recent work at Imperial College London and associated spin-out companies on solutions to these problems is discussed.

Keywords: HIGH TEMPERATURE; INSPECTION; SHM; TEMPERATURE COMPENSATION; ULTRASONIC GUIDED WAVES

Document Type: Research Article

DOI: http://dx.doi.org/10.1784/insi.2012.54.11.594

Publication date: November 1, 2012

More about this publication?
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more