DMD-Enabled Active Spatiotemporal Thermography
Department
Mechanical and Aerospace Engineering
Major
Mechanical Engineering; Math Minor
Research Advisor
Kinzel, Edward C.
Advisor's Department
Mechanical and Aerospace Engineering
Funding Source
NASA EPSCOR RID
Abstract
Thermographic techniques are well established in Non-Destructive Inspection (NDI) based environments for detection of material flaws normal to the inspected surface such as delamination and cracks parallel to the surface. However, these methods fail to detect cracks vertical to the surface. The heat flux must be tangential to the surface to detect these features. This can be done by focusing a frequency modulated radiation source on the surface (spatial confinement). However, the range of detection is limited by the natural attenuation of the thermal wave and requires scanning a target to locate features. In this work, the use of a Digital Micromirror Device (DMD) to modulate the heat source with respect to time and space is explored. The superposition of frequency multiplexed thermal waves is demonstrated and utilized to detect and locate defects without scanning a substrate. The use of a multiplexed spatially diverse thermal waves to resolve defects is demonstrated experimentally and compared to FEA and analytical models.
Biography
Samuel Fayad is a senior from Mexico, MO studying mechanical engineering with a research interest in advanced NDI methods, including thermographic inspection and x-ray CT-enabled digital imaging. He has industrial experience (Spartan Light Metal Products) and research experience (Sandia National Laboratories and Missouri S&T). Apart from academics, Sam has held executive positions and earned honors in the Beta Sigma Psi fraternity and the MST Wrestling Club. He plans to pursue a PhD in Mechanical Engineering following the completion of his BSME degree in Spring 2019.
Research Category
Engineering
Presentation Type
Oral Presentation
Document Type
Presentation
Award
Engineering oral presentation, Second place
Location
Carver Room
Presentation Date
17 Apr 2018, 9:00 am - 9:30 am
DMD-Enabled Active Spatiotemporal Thermography
Carver Room
Thermographic techniques are well established in Non-Destructive Inspection (NDI) based environments for detection of material flaws normal to the inspected surface such as delamination and cracks parallel to the surface. However, these methods fail to detect cracks vertical to the surface. The heat flux must be tangential to the surface to detect these features. This can be done by focusing a frequency modulated radiation source on the surface (spatial confinement). However, the range of detection is limited by the natural attenuation of the thermal wave and requires scanning a target to locate features. In this work, the use of a Digital Micromirror Device (DMD) to modulate the heat source with respect to time and space is explored. The superposition of frequency multiplexed thermal waves is demonstrated and utilized to detect and locate defects without scanning a substrate. The use of a multiplexed spatially diverse thermal waves to resolve defects is demonstrated experimentally and compared to FEA and analytical models.
