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A comparison of the pulsed, lock-in and frequency modulated thermography nondestructive evaluation techniques


Reference:

Chatterjee, K., Tuli, S., Pickering, S. G. and Almond, D. P., 2011. A comparison of the pulsed, lock-in and frequency modulated thermography nondestructive evaluation techniques. NDT & E International, 44 (7), pp. 655-667.

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    Official URL:

    http://dx.doi.org/10.1016/j.ndteint.2011.06.008

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    Abstract

    Pulsed, lock-in and frequency modulated thermography are three alternative nondestructive evaluation techniques. The defect imaging performance of these techniques are compared using: matched excitation energy; the same carbon fiber composite test piece and infrared camera system. The lock-in technique suffers from blind frequencies at which phase images for some defects disappear. It is shown that this problem can be overcome by using frequency modulated (chirp) excitation and an image fusion algorithm is presented that enhance phase imaging of defects. The signal-to-noise ratios (SNRs) of defect images obtained by the three techniques are presented. For the shallowest defects (depths 0.25 and 0.5 mm, 6 mm diameter), the pulsed technique exhibits the highest SNRs. For deeper defects the SNRs of the three techniques are similar in magnitude under matched excitation energy condition.

    Details

    Item Type Articles
    CreatorsChatterjee, K., Tuli, S., Pickering, S. G. and Almond, D. P.
    DOI10.1016/j.ndteint.2011.06.008
    Related URLs
    URLURL Type
    http://www.scopus.com/inward/record.url?scp=79961121369&partnerID=8YFLogxKUNSPECIFIED
    DepartmentsFaculty of Engineering & Design > Mechanical Engineering
    Research CentresMaterials Research Centre
    RefereedYes
    StatusPublished
    ID Code25729

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