Dr. Jeffrey R. Mackey Profile

Dr. Jeffrey R. Mackey

at MK Optics Inc

SPIE Involvement:

Author

Publications (6)

Proceedings Article | 26 February 2004 Paper

Sonoluminescence bubble measurements using vision-based algorithms

Nancy Hall, Jeffrey Mackey, Thomas Matula

Proceedings Volume 5265, (2004) https://doi.org/10.1117/12.516150

KEYWORDS: Stereolithography, Image processing, Acoustics, Cameras, Imaging systems, Calibration, Sonoluminescence, Machine vision, Light emitting diodes, Frame grabbers

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SPIE Journal Paper | 1 May 2003

Modulation, alignment and calibration methods for phase-modulated optical polarimeters

Jeffrey Mackey, Ezzatollah Salari, Padetha Tin

OE, Vol. 42, Issue 05, (May 2003) https://doi.org/10.1117/12.10.1117/1.1563234

KEYWORDS: Calibration, Modulators, Modulation, Polarimetry, Birefringence, Polarizers, Optical alignment, Bessel functions, Electro optics, Oscilloscopes

Proceedings Article | 22 February 2002 Paper

Wavelet-based method for the suppression of ringing on force data taken during the extensional rheology of a non-Newtonian fluid polymer

Jeffrey Mackey, Ezzatollah Salari

Proceedings Volume 4576, (2002) https://doi.org/10.1117/12.456945

KEYWORDS: Wavelets, Polymers, Interference (communication), Liquids, Bridges, Transducers, Biological research, Signal analyzers, Electronic filtering, Electrical engineering

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Proceedings Article | 14 February 2002 Paper

Electro-optic force measurement application using phase-modulated optical polarimetry

Jeffrey Mackey, Ezzatollah Salari, Stephen Spiegelberg

Proceedings Volume 4578, (2002) https://doi.org/10.1117/12.456064

KEYWORDS: Polymers, Transducers, Calibration, Birefringence, Modulators, Modulation, Electro optics, Polarimetry, Polarization, Liquid crystals

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In this paper, we describe the design and development of a high sensitivity, large dynamic range force transducer capable of measuring transient force changes in tension and compression. Conventional force transducers typically rely on the deformation of strain gauges, or on servo-mechanical load cells. While strain gauge transducers exhibit a rapid response time, they are subject to electrical noise, and typically have a minimum useful limit of approximately 10^-5 N. Servo-mechanical transducers have poor response times and exhibit compliance in the axis of deformation that is unacceptable for many applications. The research objective is to develop a novel force transducer based on the change in optical properties with loading of a pre-stressed polymer. The concept utilizes a pre-stressed polymer material as a linkage to which a force would be applied either in compression or tension. The molecular deformation of the polymer linkage will be analyzed using miniature optical components arranged as a phase-modulated polarimeter capable of birefringence measurements on the order of 10^-9. Calibration of the measured birefringence with known loads provides the necessary calibration parameters. The instrument is capable of directional force measurements and is extremely accurate for measuring low-level forces. Since the force transducer is based on optical techniques, it would be resistant to electronic noise, and would allow measurement of rapidly changing loads. The best available force transducers capable of measuring transient responses have a lower resolution of approximately 10^-5 N. Research with the rheology of fluids, transient flows of pharmaceuticals in combinatorial research, biological tissue response, and biomimetic adhesive research often require force measurements below this range. Although ultra-microbalances exist that have sensitivities well below this range, the averaging techniques employed that allow these measurements make them unsuitable for transient flows, as does the physical size of the systems.

Proceedings Article | 13 February 2001 Paper

Calibration methods for phase-modulated polarimeters

Jeffrey Mackey, Padetha Tin, Wilson Tong

Proceedings Volume 4201, (2001) https://doi.org/10.1117/12.417393

KEYWORDS: Calibration, Modulators, Polarimetry, Wave plates, Modulation, Phase shift keying, Electro optics, Polarization, Optical amplifiers, Microfluidics

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Proceedings Article | 15 December 1999 Paper

Wavelet-based denoising and ratiometric recombination of polarization-modulated stress-induced birefringence measurement signals

Jeffrey Mackey, Kamal Das

Proceedings Volume 3858, (1999) https://doi.org/10.1117/12.372923

KEYWORDS: Birefringence, Wavelets, Interference (communication), Denoising, Electrooptic modulators, Crystals, Wave plates, Signal to noise ratio, Polymers, Modulators

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Showing 5 of 6 publications

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