Mr. Timothy E. Schmidt Profile

Timothy E. Schmidt

Vice President at Trilion Quality Systems

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Publications (7)

Proceedings Article | 17 April 2013 Paper

Structural health monitoring of bridges using digital image correlation

Christopher Nonis, Christopher Niezrecki, Tzu-Yang Yu, Shafique Ahmed, Che-Fu Su, Tim Schmidt

Proceedings Volume 8695, 869507 (2013) https://doi.org/10.1117/12.2009647

KEYWORDS: Digital image correlation, Bridges, Cameras, Sensors, Structural health monitoring, 3D image processing, Optical inspection, Photography, Inspection, 3D image enhancement

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Proceedings Article | 17 March 2005 Paper

Full-field dynamic deformation and strain measurements using high-speed digital cameras

Timothy Schmidt, John Tyson, Konstantin Galanulis, Duane Revilock, Matthew Melis

Proceedings Volume 5580, (2005) https://doi.org/10.1117/12.567142

KEYWORDS: Cameras, 3D image processing, Foam, 3D metrology, Mirrors, Digital cameras, Calibration, High speed cameras, Image processing, Finite element methods

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Proceedings Article | 15 March 2004 Paper

Smart biomechanics strain measurements using 3D image correlation photogrammetry

John Tyson, Timothy Schmidt, Konstantin Galanulis

Proceedings Volume 5261, (2004) https://doi.org/10.1117/12.519194

KEYWORDS: 3D metrology, 3D image processing, Photogrammetry, Finite element methods, 3D modeling, Tissues, Bone

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Proceedings Article | 26 February 2004 Paper

Full-field dynamic displacement and strain measurement using pulsed and high-speed 3D image correlation photogrammetry

Timothy Schmidt, John Tyson, Konstantin Galanulis

Proceedings Volume 5265, (2004) https://doi.org/10.1117/12.519196

KEYWORDS: 3D image processing, 3D metrology, Cameras, Photogrammetry, Actuators, 3D displays, Video, Polymers, High speed cameras, Pulsed laser operation

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Proceedings Article | 26 February 2004 Paper

Total area strain mapping improves total quality of stampings

Timothy Schmidt, John Tyson, Konstantin Galanulis

Proceedings Volume 5265, (2004) https://doi.org/10.1117/12.519291

KEYWORDS: Cameras, Photogrammetry, Inspection, Metals, Manufacturing, Reticles, Shape analysis, Ferroelectric LCDs, Product engineering, 3D displays

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Proceedings Article | 18 September 1998 Paper

Preliminary considerations for the computer analysis of fringe maps generated when holographic interferometry is applied as an NDT tool for airframe structures

Jacqueline Mew, John Webster, Steve Hand, Timothy Schmidt

Proceedings Volume 3486, (1998) https://doi.org/10.1117/12.323777

KEYWORDS: Holography, Nondestructive evaluation, Inspection, Fringe analysis, Holographic interferometry, Skin, Aluminum, Holograms, Brain, Reflection

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The temptation when presented with the requirement to interpret holographic interferograms of aluminum aircraft structures derived through a non-destructive testing technique is to examine the whole interferogram. Computers are renowned for their ability to process large amounts of data accurately and speedily, therefore there is a strong temptation to harness their particular powers. This is not only time-consuming and wasteful of computing resources, it is also unnecessary. However, before work can begin on interpreting an interferogram by computer the problem itself must be defined. In this particular example the interferogram is from a sample taken from one of the world's aging passenger airline fleet. The sample is from an aluminum stabilizer in which faults have been induced or have occurred during the service lifetime of the aircraft. All faults have been confirmed by destructive evaluation or by alternative techniques. Thus the problem domain is known. When a human expert examines an interferogram s/he concentrates on areas where faults are likely to occur namely, the areas immediately surrounding the stringers and frames as well as the stringers and frames themselves. The faults are typically caused through endless pressurization cycles or through corrosion. These faults have been induced to show themselves by a distinctive pattern of interference fringes across stringers and frames, where normally no fringes should be expected to occur. Therefore the human expert search concentrates on these areas, using the fringe count density or shape over the whole of the interferogram simply for comparison or control. The computer aims to emulate the human search. However, difficulties have been identified that could prove problematic for the computer that are elementary for the human brain. In our early work the sample interferograms for computer analysis have been selected because, to a human, they are uncomplicated and relatively noise-free sample in which faults are easily identified. This gives a good test case against which the computer can be compared, however the strength of the computer may finally by in interpreting holographic interferograms that are difficult for humans to interpret either though complexity or human consideration such as fatigue when hundreds either though complexity or human consideration such as fatigue when hundreds of such images are required where, for example, a large structure such as an aircraft is considered.

Proceedings Article | 18 March 1998 Paper

Pulsed holographic interferometry: a technique for the detection of structural faults in aircraft structures and computerized recognition of records

John Webster, Timothy Schmidt, Jacqueline Mew

Proceedings Volume 3293, (1998) https://doi.org/10.1117/12.303661

KEYWORDS: Holography, Cameras, Holographic interferometry, Inspection, Optical design, Skin, Fringe analysis, Aluminum, Nondestructive evaluation, Imaging systems

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