Embedding fiber optic sensors in titanium matrix composites

Baldini, S. Eric; Tubbs, David J.; Stange, William A.

doi:10.1117/12.24856

Cited by 16 publications

(10 citation statements)

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“…The metal cladding process produced large residue stress. Baldini et al used gold coatings for placing single mode fibers into titanium matrix composites by arc spraying [5]. All these embedding techniques discussed above are either complicated or difficult to achieve coherent bonding with low residue stresses.…”

Section: Tayler Et Al and Lee Et Al Embedded Fiber Fabry-perotmentioning

confidence: 99%

Thermal behavior of a metal embedded fiber Bragg grating sensor

Prinz

Seim

2001

Smart Mater. Struct.

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With embedded sensors, the structures are capable of monitoring parameters at such critical locations not accessible to ordinary sensors. Recently, fiber optic sensor emerges as one promising technology to be integrated with structures. Embedding of fiber optic sensors into composites and some metals, especially those with low melting points, have been reported. However, all reported embedding techniques so far are either complicated or difficult to achieve coherent bonding with low residue stresses. Thus, it is of strong interest to pursue some economical ways to embed fiber optic sensors into metallic structures with low residue stresses. In this work, a new technique is proposed for embedding fiber optic sensor into metallic structures, such as nickel, with minimized residue stress. Fiber Bragg Grating (FBG) sensors have been embedded into nickel structures. Thermal performance of such embedded FBG sensor is studied. Higher temperature sensitivity is demonstrated for the embedded FBG sensors. For temperature measurements, the embedded FBG sensor yields an accuracy of about 2 °C. Under rapid temperature changes, it is found that thermal stresses due to the temperature gradient in the metallic structures would be the main cause for errors.

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Section: Tayler Et Al and Lee Et Al Embedded Fiber Fabry-perotmentioning

confidence: 99%

Thermal behavior of a metal embedded fiber Bragg grating sensor

Prinz

Seim

2001

Smart Mater. Struct.

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“…New smart materials which embed the optical fiber sensor within a complex structure for use in harsh environment can provide effective various information inside the structure without damaging the structure itself [4,5,6]. These kinds of smart materials also allow the forming of a distributed network detection system at long distance in order to monitor structural health during the elaboration process and the following service period.…”

Section: Introductionmentioning

confidence: 99%

Optical fiber embedding in thermal spray coating promises new smart materials design able to operate under harsh environment

Costil

Pfeiffer

et al. 2014

SPIE Proceedings

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The in-situ detection of temperature or stresses produced by the thermal spraying process is important for both the optimization of the elaboration conditions and the subsequent service monitoring of these systems. Optical fiber sensors are excellent candidates for this area of application since they can be embedded into the layers of several dissimilar materials of smart structures. This work relates mainly to the process of embedding optical fibers into ceramic coatings and to the characteristics of the embedded fiber. Firstly, thermal flame spraying is chosen as the elaboration process. Next, a thermal model is proposed in order to evaluate the thermal strain variation with the temperature during the elaboration process in the structure. Finally, a microscopic observation of the embedded optical fiber in the ceramic coating is reported, the mechanical adhesion strength of the embedded fiber is evaluated and the results of the optical attenuation change during the elaboration process are given. They show that no significant fluctuation of the optical power transmitted in the fiber is observed.

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“…Baldini and co-workers [6] used metal coatings to protect optical fibers from the high processing temperatures experienced when embedding optical fiber sensors within metal matrix composite materials. Dasgupta and Sirkis showed with analytical techniques that optimally designed linear elastic metal coatings can minimize concentrations of transverse stress components induced by structurally embedded optical fibers under axial loads, not only in host composite materials [8] but also in the coating and in the fiber sensor itself [91.…”

Section: Introductionmentioning

confidence: 99%

“…Pressure sensitivity [1], resistance to stress corrosion [2-41, tolerance to high temperature [5][6], and stress interactions with hosts in structurally embedded optical fibers {7] can all be tailored in some manner by the choice of coating material and geometry. Metals were the first unconventional material to be used with optical fiber systems.…”

Section: Introductionmentioning

confidence: 99%

<title>Thermal plastic metal coatings on optical fiber sensors</title>

Sirkis

Dasgupta

1991

SPIE Proceedings

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Optical fiber sensors coated with linear work hardening elastic-plastic materials are analytically explored to determine the effects which the coating properties have on the sensor performance. The optical fiber system is subjected to both an axial load and an arbitrary thermal gradient. An important consequence of the non-linear analysis is the discovery that this coated fiber system can be exploited to serve as an alternative to the conventional fiber breakage sensor for sensing impact damage. The non-linear analysis reveals a mechanism for designing coatings which provide a "memory" to the fiber-optic sensor by undergoing permanent deformations in response to large thermal or mechanical strain excursions.Such sensors can be utilized to maintain a permanent record of the load/damage history of a loaded structure.

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Embedding fiber optic sensors in titanium matrix composites

Cited by 16 publications

References 0 publications

Thermal behavior of a metal embedded fiber Bragg grating sensor

Thermal behavior of a metal embedded fiber Bragg grating sensor

Optical fiber embedding in thermal spray coating promises new smart materials design able to operate under harsh environment

<title>Thermal plastic metal coatings on optical fiber sensors</title>

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