Interferometric optical fibre sensors using internal mirrors

Lee, C.E.; Taylor, Henry F.

doi:10.1049/el:19880128

Cited by 158 publications

(31 citation statements)

References 8 publications

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“…We have chosen in our developments to make the optical cavities by assembling fiber ends face-to-face with a partially reflecting coating in-between. Such an approach is quite close to the one already chosen by some other authors [21]- [24].…”

Section: State-of-the-art Of Quasi-distributed Optical Fiber Extesupporting

confidence: 75%

Multiplexed Long-Base Flexible Optical Fiber Extensometers and Temperature Bragg Sensors Interrogated by Low-Coherence Interferometry

Delépine-Lesoille

Merliot

Gautier³

et al. 2008

IEEE Sensors J.

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We present a novel concept of quasi-distributed flexible optical fiber extensometers fully compensated from thermal variations. Developed for structural health monitoring applications, the sensors are composed of a combination of intrinsic Fabry-Perot cavities as long-base extensometers, and point-like Bragg gratings inserted along the same fiber used as temperature sensors. This configuration enables a high degree of multiplexing, thus quasi-distributed sensing, and very efficient temperature compensation. Both types of sensors are read by a fiber-optic low-coherence interferometer, used in an original way to measure simultaneously the length variations of the cavities and the wavelength shifts of the Bragg gratings. Finally, we present the experimental validation of the whole measurement system, suitable for concrete structures instrumentation, as it includes an original optical fiber sheath packaging the optical fiber as a flexible sensor.Index Terms-Fabry-Perot interferometers, optical fiber sensors (OFSs), strain measurement, structural health monitoring, temperature measurement.

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Section: State-of-the-art Of Quasi-distributed Optical Fiber Extesupporting

confidence: 75%

Multiplexed Long-Base Flexible Optical Fiber Extensometers and Temperature Bragg Sensors Interrogated by Low-Coherence Interferometry

Delépine-Lesoille

Merliot

Gautier³

et al. 2008

IEEE Sensors J.

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“…A relatively new technique described by Lee and Taylor involves fabricating semireflective splices in a continuous length of fiber [4].…”

Section: Sensor Background and Descriptionmentioning

confidence: 99%

High Temperature Fabry-Perot Based Strain Sensor for Ceramic Cross Flow Filters

Murphy

Koob

Plante

et al. 1992

Review of Progress in Quantitative Nondestructive Evaluation

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The objectives of this research program were to develop instrumentation methods to allow in-situ analysis of ceramic cross flow (CXF) filters.Information from such instrumentation is needed to determine how the filters perform during operation, how subsequent filter and combustor designs may be improved based on the knowledge of such performance, and how and where damage and degradation occur. CXF filters are used for hot gas clean-up of coal-fired power generation systems, such as pressurized fluidized-bed combustors and integrated gasifier-combined cycles.The ceramic cross flow filter is analogous to cross-flow he at exchangers, except gas is passed between channels instead of thermal energy (heat) . The CXF filters are made from multiple layers of thin , flat, porous ceramic (alumina or silicon nitride) with grooves which form channels in each layer.The layers are stacked to form a filter element that is approximately 30 cm high by 30 cm long by 10 cm wide. Consecutive layers of ceramic are oriented such that the channels formed are perpendicular to each other. One of the sides of the filter element is sealed. Gas enters the filter through the openings of the channel on the two sides that are perpendicular to the sealed end, permeates the porous ceramic, and exits through the openings on the side that is parallel to the sealed end.Particles are removed from the gas stream by direct interception, diffusion, and inertial impaction.The filter elements are periodically backflushed with abrief, high-pressure cleaning pulse of air or nitrogen to remove the particles that were deposited on the dirty side of the dividing walls. The CXF filter operates in an extremely corrosive and erosive environment while undergoing temperatures between 500 and 900 0 C and pressures up to 2500 kPa.

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“…The fusion-spliced fiber Fabry-Perot has been developed by Lee and Taylor at Texas A&M [24] using sputtered Ti02 mirrors internal to the fibers. They have embedded this sensor in graphite/epoxy and used it as a temperature sensor [11].…”

Section: Fabry-perotmentioning

confidence: 99%

Fiber-Optic Strain Sensors for Smart Structures

Turner

Valis

Hogg

et al. 1990

Journal of Intelligent Material Systems and Structures

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A set of requirements is proposed for fiber-optic strain sensors, and specific criteria are suggested for such sensors in the context of "smart" structures. The suitability of several potential sensor types is evaluated against these criteria, and the characteristics of two particular suitable sensors are presented.Experimental strain sensitivities of 0.060°/(μ∈-cm) and 6.5°/(μ∈-cm) for the highbirefringence polarimetric and localized Michelson sensors, respectively, are determined. Fiber-optic strain rosettes based on both polarimetric and interferometric sensors have been built and tested. Advantages and disadvantages of each sensor are presented from the perspective of smart structure strain measurements. Future sensor configurations are discussed.

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Interferometric optical fibre sensors using internal mirrors

Cited by 158 publications

References 8 publications

Multiplexed Long-Base Flexible Optical Fiber Extensometers and Temperature Bragg Sensors Interrogated by Low-Coherence Interferometry

Multiplexed Long-Base Flexible Optical Fiber Extensometers and Temperature Bragg Sensors Interrogated by Low-Coherence Interferometry

High Temperature Fabry-Perot Based Strain Sensor for Ceramic Cross Flow Filters

Fiber-Optic Strain Sensors for Smart Structures

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