Damage Detection In Composites With Embedded Fibre Optic Interferometric Sensors

Liu, Kexing; Ferguson, Suzanne M.; Measures, Raymond M.

doi:10.1117/12.963098

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…The embedded sensitivity (using linear beam theory) was 2 x 6.930 =i= 0.535°/(¡-tE-cm). This sensitivity is adequate to permit the detection of acoustic emission in composites associated with the formation of delamination [23].…”

Section: Michelsonmentioning

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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Section: Michelsonmentioning

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 growth of the damage induced by repeated impacts at the same sites could also be monitored by the optical signal variations [39,61,66]. For quasi-statically loaded beams, a growth of the delaminations was examined by using a recorded extension of the embedded optical fibre of a Mach-Zehnder sensor [80], the signal characteristics of EFPI sensors [87] or the amplitude variations of Michelson sensor [114].…”

Section: Assessment Of Damage From a Known Locationmentioning

confidence: 99%

Damage detection and assessment in fibre-reinforced composite structures with embedded fibre optic sensors-review

Zhou¹,

Sim

2002

Smart Mater. Struct.

233

140

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A state-of-the-art review is presented regarding the research and development of in situ fibre optic damage detection and assessment systems (FODDAS) embedded in fibre-reinforced composite structures. Representative individual fibre optic strain sensors and distributed sensor networks are briefly described. A major emphasis is placed on their capabilities for detecting damage, determining damage location and assessing the nature of damage, arising primarily from specific events such as impacts or quasi-static stress overloads. The main features of such systems as custom-built and structure-specific units with minimal human involvement are highlighted. Issues that could affect the validity of the performance of such strain sensors are discussed. Fracture and non-fracture of fibre optic sensors are identified as two fundamentally different approaches for damage detection and their primary features are discussed in relation to location determination and evaluation of the nature of damage. The major advantages and limitations of each approach are discussed. Directions and areas of potential future research in the development of related FODDAS are highlighted.

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“…First of all, one can use synthetic heterodyne to obtain sin((t)) and cos((t)) electronically as same as Eqs . (1) through (4). Sin((t)) is multiplied by cos(t(t)) from the AD639 to obtain Signal 1 , and cos((t)) is multiplied by sin(/i(t)) from the other AD639 to obtain Signal 2.…”

Section: Sin()icos() Based Phase Tracker (Phase Tracker Ii)mentioning

confidence: 99%

“…I(Oc =BJ1()sin(ç1(t)) ;(3) and'2 -BJ2(4)cos(4(t)) ,(4) where I and '2CC are defined as the signal proportional to sin(q5(t)) and cos((t)), respectively. Using the sin()/cos() pair from Eqs.…”

mentioning

confidence: 99%

<title>Optical fiber sensors embedded in composite panels for impact detection</title>

Chang

Sirkis

1995

Smart Structures and Materials 1995: Smart Sensing, Processing, and Instrumentation

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This paper mainly describes a methodology of finding appropriate optical fiber sensors and associated potential demodulation techniques that have the capability to measure impact induced high-strain rate events in graphite/epoxy panels. The capacity of the sensor's dynamic range has to accommodate the average failure strain of about 9,000 j and center frequency of about 40 Hz for a typical low velocity impact event for [90,/04/OF(0)/04/902] and [(45/-45)3/OF(0)/(-45/45)3] layups. Three potential demodulators are investigated. These include the synthetic heterodyne with differential-cross-multiplier (DCM), single channel phase tracker, and sin(4)/cos() based analog phase tracker all using a 1 0 KHz sinusoidal modulation. The maximum sensor lengths for different sensor types have been calculated based on the Fourier spectrum of a typical impact event and maximum detectable phase vs. frequçncy of these demodulators. As a result, a localized and reflective version of a In-Line Fiber Etalon (ILFE) sensor with a maximum cavity length of 73 jm for 1 .3 pm wave-length of a light source is selected for impact testing. The strain responses from three different demodulators are comparable to that of a surface mounted resistance strain gage.

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Damage Detection In Composites With Embedded Fibre Optic Interferometric Sensors

Abstract: An optical fibre Michelson interferometer is embedded in Kevlar -epoxy composites for acoustic emission detection. Application of this sensor system to damage detection in composites is demonstrated.

Cited by 10 publications

References 3 publications

Fiber-Optic Strain Sensors for Smart Structures

Fiber-Optic Strain Sensors for Smart Structures

Damage detection and assessment in fibre-reinforced composite structures with embedded fibre optic sensors-review

<title>Optical fiber sensors embedded in composite panels for impact detection</title>

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