Mr. Alpheus W. Burner Profile

Alpheus W. Burner

Retired

SPIE Involvement:

Author

Proceedings Article | 10 November 2003 Paper

In-flight aeroelastic measurement technique development

Alpheus Burner, William Lokos, Danny Barrows

Proceedings Volume 5191, (2003) https://doi.org/10.1117/12.504157

KEYWORDS: Cameras, Wind measurement, Fused deposition modeling, Image processing, Video, Photogrammetry, Aerodynamics, Digital imaging, Calibration, Edge detection

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Proceedings Article | 29 April 2003 Paper

Phase-stepping interferometric system for capturing instantaneous flow field under harsh environments

Alpheus Burner, Enxi Yu, Soyoung Cha

Proceedings Volume 5058, (2003) https://doi.org/10.1117/12.509888

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Interferometric reconstruction of a flow field usually consists of three steps. The first is to record interferograms, the second is to extract phase information from interferograms and the final is for numerical inversion of the phase data. In interferometric flow recording, test section enclosures and opaque models are frequently present, blocking a portion of the probing rays or restricting the view angle of the field to produce a partial data set especially for interferometric tomography. It also involves very harsh environments with external vibrations and disturbances of the ambient air. The ill-posed problem is susceptible to experimental noise and can produce serious distortions in reconstruction. Interferometric reconstruction of flow fields thus needs accurate phase information extraction. The major problem encountered in interferometry is that it is extremely sensitive to external disturbances including the vibration of the optical setup. This is true especially for aerodynamic wind tunnel testing. For successful application of interferometry to experimental fluid mechancis and heat/mass transfer, efficient mechanisms for accurate flow-field recording and information extraction are thus very necessary. In interferometric recording, use of the phase stepping techniques is desirable whenever possible, since they provide the most accuracy. However, they are not applicable under disturbing conditions; that is, under harsh environments. In an effort to provide accurate interferometric data, we device interferogram recording and reduction techniques. They are based on a phase-stepping method: however, applicable to harsh environments including wind tunnel testing. Here we present the governing concepts, investigation results, and application demonstration of our approaches for practical flow measurements. The developed approaches are tested through phoase extraction and 3D reconstruction of an experimental flow field, which is designed for future wind tunnel testing. The test conditions are very harsh, involving building vibrations and ambient air disturbances especially during the interferometric data acquisition in the phase stepping process. The results of the thermocouple readings agree fairly well with those from the experiment when compared. The acceptable error in the entire interferometric reconstruction process is believed to be mainly due to the ill-posed nature of the tomographic reconstruction but not from the phase extraction of the employed phase-stepping technique.

Proceedings Article | 9 July 2002 Paper

DARPA/AFRL Smart Wing Phase 2 wind tunnel test results

Lewis Scherer, C. Martin, Brian Sanders, Mark West, Jennifer Pinkerton-Florance, Carol Wieseman, Alpheus Burner, Gary Fleming

Proceedings Volume 4698, (2002) https://doi.org/10.1117/12.475104

KEYWORDS: Unmanned combat air vehicles, Aerodynamics, Shape memory alloys, Data modeling, Wind measurement, Point spread functions, Smart materials, Instrument modeling, Safety, Information operations

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Proceedings Article | 26 November 2001 Paper

Development of an intelligent videogrammetric wind tunnel measurement system

Sharon Graves, Alpheus Burner

Proceedings Volume 4448, (2001) https://doi.org/10.1117/12.449368

KEYWORDS: Image processing, Intelligence systems, Cameras, Fuzzy logic, Visual process modeling, Wind measurement, Data modeling, Machine vision, Computing systems, 3D modeling

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Proceedings Article | 13 October 1999 Paper

Deformation measurements of smart aerodynamic surfaces

Gary Fleming, Alpheus Burner

Proceedings Volume 3783, (1999) https://doi.org/10.1117/12.365741

KEYWORDS: Cameras, Data acquisition, Calibration, Shape memory alloys, Wind measurement, Systems modeling, Image processing, Video, Aerodynamics, Projection systems

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Proceedings Article | 9 July 1999 Paper

DARPA/ARFL/NASA Smart Wing second wind tunnel test results

Lewis Scherer, Christopher Martin, Mark West, Jennifer Florance, Carol Wieseman, Alpheus Burner, Gary Fleming

Proceedings Volume 3674, (1999) https://doi.org/10.1117/12.351563

KEYWORDS: Shape memory alloys, Wind measurement, Aerodynamics, Sensors, Point spread functions, Smart materials, Instrument modeling, Performance modeling, Spindles, Data modeling

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Proceedings Article | 7 July 1997 Paper

Videometric applications in wind tunnels

Alpheus Burner, Ron Radeztsky, Tianshu Liu

Proceedings Volume 3174, (1997) https://doi.org/10.1117/12.279785

KEYWORDS: Wind measurement, Data modeling, Aerodynamics, Temperature metrology, Surface finishing, Cryogenics, Calibration, Video

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Proceedings Article | 29 September 1995 Paper

Interfermometric tomographic measurement of an instantaneous flow field under adverse environments

Enxi Yu, Soyoung Cha, Alpheus Burner

Proceedings Volume 2546, (1995) https://doi.org/10.1117/12.221565

KEYWORDS: Tomography, Interferometry, Holography, Holograms, Environmental sensing, Fringe analysis, Opacity, Phase shift keying, Integral transforms, Diffusers

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