Title

DMD-Enabled Active Spatiotemporal Thermography

Presenter Information

Samuel Fayad

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

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Apr 17th, 9:00 AM Apr 17th, 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.