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Ultrasound Material Characterization of Complex Matrix Material and Mitigation of Noise using Signal Processing Techniques

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dc.contributor.advisor Cook, Gerald
dc.contributor.author Jakkidi, Shwetha
dc.creator Jakkidi, Shwetha
dc.date.accessioned 2016-04-19T19:29:43Z
dc.date.available 2016-04-19T19:29:43Z
dc.date.issued 2015
dc.identifier.uri https://hdl.handle.net/1920/10192
dc.description.abstract Ultrasonic inspection as a non-destructive technique is used to inspect various materials for subsurface defects caused by air, cracks, material variation etc. Sometimes particles are added to clean materials to improve the strength and thermal conductivity of the material. While this improves the material properties, the presence of these particles causes attenuation of the ultrasonic signal, loss of signal strength and also signal scattering. Due to this, imaging subsurface interfaces with the complex matrix material as a primary interface is challenging. The images from subsurface interfaces are noisy and the features are not well resolved. This dissertation addresses the development of a transfer function for the noise caused by the filler particles that corrupts the Ultrasonic signal. The transfer function is based on frequency domain transform of modeled ultrasonic reflection from clean material and modeled ultrasonic reflection from the complex matrix material with particles in the size range of 150um-250um. A real sample with particles was made and imaged ultrasonically. The transfer function was applied to the A-scan data from the sample with particles to assess the performance of the transfer function for this application. The transfer function approach was extended to a case where the sample has a pattern on the back wall to assess the performance of this method.
dc.format.extent 160 pages
dc.language.iso en
dc.rights Copyright 2015 Shwetha Jakkidi
dc.subject Electrical engineering en_US
dc.subject complex matrix material en_US
dc.subject electronic component en_US
dc.subject filler particle scattering en_US
dc.subject transfer function en_US
dc.subject Ultrasonic inspection en_US
dc.title Ultrasound Material Characterization of Complex Matrix Material and Mitigation of Noise using Signal Processing Techniques
dc.type Dissertation en
thesis.degree.level Doctoral en
thesis.degree.discipline Electrical and Computer Engineering en
thesis.degree.grantor George Mason University en


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