Sparse leave in place sensor array technology and Computed tomography technology are used in structural health monitoring of aircraft components. In the sample problem with 8 sensors on an E2 plane wing, an artificial saw cut defect is clearly detected and localized. To cope with the complicated wave phenomenon in the aircraft wing structure, signal difference coefficients derived from normalized cross correlation are used as a quantitative feature for defect detection and defect image reconstruction. Back projection method and algebraic reconstruction technology technologies are both used in the defect image reconstruction. With a modification to the standard back projection algorithm, better defect signatures are obtained. By bringing out the concept of multi resolution image reconstruction, the resolution of defect image reconstruction is improved from the original algebraic reconstruction method. In the defect localization algorithms presented in this paper, direct line path of the ultrasound is assumed between each sensor pair. Actually, the existence of a defect beside the direct path will also affect the signal of a sensor pair. Improved algorithms counting the influence of environmental scattering will be developed in the future study.
Guided wave tomography on an aircraft wing with leave in place sensors
Tomographie mit geführten Schallwellen an Flugzeugflügel mittels eigebauter Sensoren
2005
7 Seiten, 9 Bilder, 10 Quellen
Conference paper
Storage medium
English
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