Mr. Robert S. Fielder Profile

Robert S. Fielder

Director/Optical Devices Group at TechOpp Consulting Inc

SPIE Involvement:

Author

Proceedings Article | 8 April 2008 Paper

Fiber optics based ion discriminator

Roman Ostroumov, Vladimir Kochergin, Robert Fielder

Proceedings Volume 6932, 69322J (2008) https://doi.org/10.1117/12.777194

KEYWORDS: Ions, Sensors, Particles, Optical fibers, Fiber optics, Electrons, Ionization, Fiber optics sensors, Aerospace engineering, Environmental sensing

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Proceedings Article | 30 March 2006 Paper

Real-time pressure monitoring for dynamic control during paper mill operation using fiber optic pressure sensors

Robert Fielder, Clark Boyd, Matthew Palmer, Oddbjørn Eriksen

Proceedings Volume 6171, 61710B (2006) https://doi.org/10.1117/12.658463

KEYWORDS: Sensors, Fiber optics sensors, Calibration, Fiber optics, Transducers, Medium wave, Reflection, Sensor calibration, Signal processing, Data analysis

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Proceedings Article | 14 December 2004 Paper

State of the art in high-temperature fiber optic sensors

Robert Fielder, Kelly Stinson-Bagby, Matthew Palmer

Proceedings Volume 5589, (2004) https://doi.org/10.1117/12.583341

KEYWORDS: Sensors, Fiber optics sensors, Temperature sensors, Transducers, Sapphire, Calibration, Temperature metrology, Fiber optics, Aerospace engineering, Computer aided design

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Proceedings Article | 29 July 2004 Paper

Distributed strain and temperature mapping in the Safe Affordable Fission Engine (SAFE-100) thermal simulator using fiber Bragg gratings

Kelly Stinson-Bagby, Robert Fielder

Proceedings Volume 5388, (2004) https://doi.org/10.1117/12.540336

KEYWORDS: Sensors, Fiber Bragg gratings, Temperature metrology, Decision support systems, Temperature sensors, Argon, Optical simulations, Space operations, Fiber optics sensors, Reflectivity

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Proceedings Article | 29 July 2004 Paper

Harsh-environment fiber optic sensors for structural monitoring applications

Robert Fielder, Kelly Stinson-Bagby, Matthew Palmer

Proceedings Volume 5388, (2004) https://doi.org/10.1117/12.540330

KEYWORDS: Sensors, Fiber optics sensors, Temperature sensors, Transducers, Fiber optics, Sapphire, Temperature metrology, Calibration, Aerospace engineering, Ceramics

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Proceedings Article | 8 March 2004 Paper

Fiber optic sensor integration system and measurement technique

Kelly Stinson-Bagby, Michael Marcus, Robert Fielder

Proceedings Volume 5272, (2004) https://doi.org/10.1117/12.515171

KEYWORDS: Sensors, Fiber optics sensors, Multiplexing, System integration, Fiber optics tests, Aerospace engineering, Temperature metrology, Associative arrays, Fiber optics, Michelson interferometers

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Proceedings Article | 8 March 2004 Paper

High-temperature fiber optic sensors for harsh environment applications

Robert Fielder, Kelly Stinson-Bagby

Proceedings Volume 5272, (2004) https://doi.org/10.1117/12.516213

KEYWORDS: Fiber optics sensors, Temperature sensors, Sensors, Environmental sensing, Ceramics, Fiber optics, Metals, Oxides, Transducers, Patents

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Proceedings Article | 22 July 2003 Paper

Flight demonstration of fiber optic sensors

Jennifer Elster, Angela Trego, Charles Catterall, Josh Averett, Mark Jones, Mishell Evans, Bob Fielder

Proceedings Volume 5050, (2003) https://doi.org/10.1117/12.484245

KEYWORDS: Sensors, Fiber optics sensors, Optical fibers, Humidity, Refractive index, Fiber optics, Data acquisition, Photography, Calibration, Temperature sensors

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Proceedings Article | 14 February 2002 Paper

High-temperature high-bandwidth fiber optic MEMS pressure-sensor technology for turbine-engine component testing

Wade Pulliam, Patrick Russler, Robert Fielder

Proceedings Volume 4578, (2002) https://doi.org/10.1117/12.456079

KEYWORDS: Sensors, Fiber optics sensors, Fiber optics, Environmental sensing, Silicon carbide, Temperature metrology, Transducers, Sensor technology, Data acquisition, Demodulation

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Acquiring accurate, transient measurements in harsh environments has always pushed the limits of available measurement technology. Until recently, the technology to directly measure certain properties in extremely high temperature environments has not existed. Advancements in optical measurement technology have led to the development of measurement techniques for pressure, temperature, acceleration, skin friction, etc. using extrinsic Fabry-Perot interferometry (EFPI). The basic operating principle behind EFPI enables the development of sensors that can operate in the harsh conditions associated with turbine engines, high-speed combustors, and other aerospace propulsion applications where the flow environment is dominated by high frequency pressure and temperature variations caused by combustion instabilities, blade-row interactions, and unsteady aerodynamic phenomena. Using micromachining technology, these sensors are quite small and therefore ideal for applications where restricted space or minimal measurement interference is a consideration. In order to help demonstrate the general functionality of this measurement technology, sensors and signal processing electronics currently under development by Luna Innovations were used to acquire point measurements during testing of a transonic fan in the Compressor Research Facility (CRF) at the Turbine Engine Research Center (TERC), WPAFB. Acquiring pressure measurements at the surface of the casing wall provides data that are useful in understanding the effects of pressure fluctuations on the operation and lifetime wear of a fan. This measurement technique is useful in both test rig applications and in operating engines where lifetime wear characterization is important. The measurements acquired during this test also assisted in the continuing development of this technology for higher temperature environments by providing proof-of-concept data for sensors based on advanced microfabrication and optical techniques.

Showing 5 of 9 publications

Conference Committee Involvement (3)

Photonic Sensing Technologies

2 October 2006 | Boston, Massachusetts, United States

Fiber Optic Sensor Technology and Applications IV

25 October 2005 | Boston, MA, United States

Fiber Optic Sensor Technology and Applications III

26 October 2004 | Philadelphia, Pennsylvania, United States

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