Dr. Angela Trego Profile

Dr. Angela Trego

Engineer at Boeing Co

SPIE Involvement:

Author

Proceedings Article | 20 November 2003 Paper

An update on monitoring moisture ingression with fiber optic sensors

Angela Trego

Proceedings Volume 5278, (2003) https://doi.org/10.1117/12.544398

KEYWORDS: Sensors, Fiber optics sensors, Fiber Bragg gratings, Composites, Optical fibers, Refractive index, Humidity, Fiber optics, Cladding, Temperature sensors

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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 | 24 July 2001 Paper

Optical-fiber-based adhesive bondline monitoring system for composite patch systems

Jennifer Elster, Angela Trego, James Dante, Mark Jones, Jason Avram

Proceedings Volume 4335, (2001) https://doi.org/10.1117/12.434173

KEYWORDS: Sensors, Composites, Fiber Bragg gratings, Optical fibers, Adhesives, Refractive index, Cladding, Multiplexing, Chemical fiber sensors, Fiber optics sensors

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Proceedings Article | 12 June 2000 Paper

Progress on monitoring of adhesive joints using multiaxis fiber grating sensors

Whitten Schulz, Eric Udd, John Seim, Ignacio Perez, Angela Trego

Proceedings Volume 3991, (2000) https://doi.org/10.1117/12.388187

KEYWORDS: Sensors, Adhesives, Fiber optics sensors, Structured optical fibers, Polarization, Spectrum analysis, Epoxies, Connectors, Silicon, Roads

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Proceedings Article | 12 June 2000 Paper

Multidimensional strain field measurements using fiber optic grating sensors

Eric Udd, Whitten Schulz, John Seim, Eric Haugse, Angela Trego, Patrick Johnson, Thomas Bennett, Drew Nelson, Alberto Makino

Proceedings Volume 3986, (2000) https://doi.org/10.1117/12.388113

KEYWORDS: Fiber optics sensors, Sensors, Optical fibers, Polarization, Roads, Fiber optics, Composites, Adhesives, Structured optical fibers, Bridges

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Proceedings Article | 5 May 2000 Paper

Transversely loaded fiber optic grating strain sensors for aerospace applications

Eric Udd, Whitten Schulz, John Seim, Angela Trego, Eric Haugse, Patrick Johnson

Proceedings Volume 3994, (2000) https://doi.org/10.1117/12.385019

KEYWORDS: Sensors, Fiber optics sensors, Aerospace engineering, Corrosion, Fiber optics, Adhesives, Composites, Temperature metrology, Roads, Sensor technology

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Proceedings Article | 28 January 1999 Paper

Health monitoring of an adhesive joint using a multiaxis fiber grating strain sensor system

Whitten Schulz, Eric Udd, Mike Morrell, John Seim, Ignacio Perez, Angela Trego

Proceedings Volume 3586, (1999) https://doi.org/10.1117/12.339906

KEYWORDS: Sensors, Adhesives, Fiber optics sensors, Roads, Aerospace engineering, Aluminum, Light sources, Demodulation, Spectrum analysis, Structured optical fibers

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Proceedings Article | 23 September 1998 Paper

Material removal rate fiber optic corrosion sensor

Angela Trego, Eric Haugse, Eric Udd

Proceedings Volume 3489, (1998) https://doi.org/10.1117/12.323422

KEYWORDS: Sensors, Corrosion, Fiber optics sensors, Fiber optics, Fiber Bragg gratings, Aluminum, Temperature metrology, Birefringence, Prototyping, Optical fabrication

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Fiber Bragg grating sensors generally consist of a single grating written in a low-birefringent optical fiber. The wavelength shift of the peak in the reflected spectrum from these sensors can be used to measure a single component of strain or a change in temperature [Lawrence, 1997]. Fibers are also available with a significant enough birefringence to maintain the polarization state along great lengths and through many turns. This 'polarization maintaining' fiber is commercially available through several companies and in several configurations (including different cladding material and wavelength shift). The grating usually extends approximately 3 mm - 5 m in length. Udd gives a detailed explanation of fiber optics, Bragg gratings and birefringence [Udd, 1991]. As light from an LED is passed through the fiber, only the wavelength consistent with the grating period will be reflected back towards the source. All other wavelengths will pass through. The reflected spectrum will shift as the fiber is strained along its axis at the grating location. Strain or temperature changes at any other location have negligible effect on the wavelength encoded data output. When the Fiber Bragg grating single-axis sensor (termed fiber hereafter) is strained transversely the wavelength will separate into two distinct peaks according to a mathematical relationship defined by Lawrence and Nelson [Lawrence, Nelson et al. 96]. Using these Fiber Bragg grating fibers a corrosion sensor which measures the rate of material was developed. The principle behind this newly developed corrosion sensor is to pre-stress the fiber with a known load. The load is applied by inducing a uniform hoop stress through pressure fitted cylinders around the fiber. This induced stress creates a broadening of the reflected spectrum until the bifurcation of the reflected intensity peaks is distinguishable. As the material from the outer cylinder corrodes away the applied stress will be relieved. Finally, when no load is achieved, the reflected spectrum will have a single peak centered around the nominal Bragg grating wavelength. If a polarizing-maintaining 3-axis grating is used then the sensor would be even more sensitive, having two distinct peaks in each wavelength regime which shift.

Showing 5 of 8 publications

Conference Committee Involvement (2)

Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems

7 March 2005 | San Diego, California, United States

Sixth Pacific Northwest Fiber Optic Sensor Workshop

14 May 2003 | Troutdale, OR, United States

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