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Quality inspection of small diameter polymeric medical tubing and attached wire stent using TAP-NDE and the Gabor Wavelet Transform
dc.creator | Harms, Kent David | |
dc.date.accessioned | 2012-06-07T23:05:05Z | |
dc.date.available | 2012-06-07T23:05:05Z | |
dc.date.created | 2001 | |
dc.date.issued | 2001 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/ETD-TAMU-2001-THESIS-H378 | |
dc.description | Due to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item. | en |
dc.description | Includes bibliographical references (leaves 84-87). | en |
dc.description | Issued also on microfiche from Lange Micrographics. | en |
dc.description.abstract | A non-contact, laser-optic based technique referred to as the Thermo-Acousto-Photonic Nondestructive Evaluation (TAP-NDE) was utilized to investigate bond integrity and localized stiffening due to an attached wire stent on small diameter polymeric medical tubing. Laser generated interrogating ultrasonic waves in the tubing were detected by use of a Fiber-Tip Interferometer (FTI) and a continuous wave HeNe laser. The time-frequency analysis of the generated dispersive waves was performed using the Gabor Wavelet Transform (GWT) that effectively decomposed the digitized waveguide mode enabling identification of defect characteristic frequency tendencies. Three different bond defects were evaluated: tensile pull, needle puncture, and crease. These induced flaws represent possible manufacturing defects such as de-bond, potential leak sources, and geometry irregularities. The frequency tendencies were found to uniquely identify each bond defect. Frequency tendencies were also found to uniquely identify localized stiffening due to an attached wire stent proving that this technique can unambiguously identify propagation modes from among non-propagation modes or vibrations. These findings demonstrate the utility of TAP-NDE and the GWT for quality inspection of small diameter polymeric medical tubing. A non-contact, laser-optic based technique referred to as the Thermo-Acousto-Photonic Nondestructive Evaluation (TAP-NDE) was utilized to investigate bond integrity and localized stiffening due to an attached wire stent on small diameter polymeric medical tubing. Laser generated interrogating ultrasonic waves in the tubing were detected by use of a Fiber-Tip Interferometer (FTI) and a continuous wave HeNe laser. The time-frequency analysis of the generated dispersive waves was performed using the Gabor Wavelet Transform (GWT) that effectively decomposed the digitized waveguide mode enabling identification of defect characteristic frequency tendencies. Three different bond defects were evaluated: tensile pull, needle puncture, and crease. These induced flaws represent possible manufacturing defects such as de-bond, potential leak sources, and geometry irregularities. The frequency tendencies were found to uniquely identify each bond defect. Frequency tendencies were also found to uniquely identify localized stiffening due to an attached wire stent proving that this technique can unambiguously identify propagation modes from among non-propagation modes or vibrations. These findings demonstrate the utility of TAP-NDE and the GWT for quality inspection of small diameter polymeric medical tubing. | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_US | |
dc.publisher | Texas A&M University | |
dc.rights | This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. | en |
dc.subject | mechanical engineering. | en |
dc.subject | Major mechanical engineering. | en |
dc.title | Quality inspection of small diameter polymeric medical tubing and attached wire stent using TAP-NDE and the Gabor Wavelet Transform | en |
dc.type | Thesis | en |
thesis.degree.discipline | mechanical engineering | en |
thesis.degree.name | M.S. | en |
thesis.degree.level | Masters | en |
dc.type.genre | thesis | en |
dc.type.material | text | en |
dc.format.digitalOrigin | reformatted digital | en |
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