Dr. Steven M. Shepard
President at Thermal Wave Imaging Inc
SPIE Involvement:
Conference Program Committee | Author | Instructor
Publications (37)

Proceedings Article | 7 June 2024 Presentation + Paper
Proceedings Volume 13047, 1304712 (2024) https://doi.org/10.1117/12.3014434
KEYWORDS: Infrared cameras, Cameras, Thermography, Reflection, Infrared imaging, Aluminum, Power supplies, Visible radiation, Photodiodes, Metals

Proceedings Article | 14 May 2019 Presentation
Proceedings Volume 11004, 110040P (2019) https://doi.org/10.1117/12.2521441
KEYWORDS: Thermography, Infrared cameras, Principal component analysis, Nondestructive evaluation, Visualization, Cameras, Signal processing, Lithium

Proceedings Article | 12 May 2015 Paper
Proceedings Volume 9485, 94850R (2015) https://doi.org/10.1117/12.2176748
KEYWORDS: Thermography, Infrared cameras, Cameras, Nondestructive evaluation, Interference (communication), Computing systems, Signal detection, Autoregressive models, Analytical research, Infrared imaging

Proceedings Article | 22 May 2013 Paper
Proceedings Volume 8705, 87050S (2013) https://doi.org/10.1117/12.2017899
KEYWORDS: Thermography, Signal to noise ratio, Signal processing, Infrared cameras, Cameras, Interference (communication), Image processing, Diffusion, Thermal modeling, Nondestructive evaluation

Proceedings Article | 22 April 2009 Paper
Steven Shepard, James Lhota, Tasdiq Ahmed
Proceedings Volume 7299, 72990T (2009) https://doi.org/10.1117/12.820062
KEYWORDS: Cameras, Infrared cameras, Thermography, Signal processing, Diffusion, Nondestructive evaluation, Infrared technology, Quantization, Temperature metrology, Aluminum

Showing 5 of 37 publications
Proceedings Volume Editor (2)

Conference Committee Involvement (29)
Thermosense: Thermal Infrared Applications XLVII
13 April 2025 | Orlando, Florida, United States
Thermosense: Thermal Infrared Applications XLVI
22 April 2024 | National Harbor, Maryland, United States
Thermosense: Thermal Infrared Applications XLV
2 May 2023 | Orlando, Florida, United States
Thermosense: Thermal Infrared Applications XLIV
5 April 2022 | Orlando, Florida, United States
Thermosense: Thermal Infrared Applications XLIII
12 April 2021 | Online Only, Florida, United States
Showing 5 of 29 Conference Committees
Course Instructor
SC786: Practical Thermography for Nondestructive Testing
This course will provide a basic understanding of the principles and capabilities of modern systems for Thermographic Nondestructive Testing (TNDT). TNDT is widely used to detect and evaluate a range of sub-surface defects including voids, delaminations, inclusions, porosity and corrosion. The course concentrates on clarifying the fundamental physical limitations that apply to all thermographic methods, and then showing how various approaches to excitation, acquisition, instrumentation and analysis can be used to reach and even exceed those limits. Examples of TNDT for metals, composites and ceramics will be presented and discussed. Approaches including flash, step, modulated, lock-in and sonic TNDT will be covered.
SC185: Transient Thermographic NDE
Transient infrared (IR) thermography is a powerful method of nondestructive testing (NDT) used by the aerospace industry. This short course provides an overview of fundamentals of NDT (TNDT) including cutting-edge test technologies and data-processing algorithms. A review of the properties of a subsurface defect and its host material are presented. Differences of using pulsed and harmonic wave thermal excitation are discussed. TNDT techniques are described and applied by creating defect maps. The course includes demonstrations of two-and three-dimensional thermal models that also illustrate their limits. Examples relate to composite and layered structures used in the aerospace industry, although the same principles apply to most structures. Special attention will be paid to standard and advanced data processing that provides a better reliability of defect detection.
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