Optical fibre acoustic emission sensor for damage detection in carbon fibre composite structures

Read, Ian; Foote, Peter; Murray, S.

doi:10.1088/0957-0233/13/1/402

Cited by 62 publications

(28 citation statements)

References 1 publication

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“…As technical alternative to piezoelectric materials, various other detection methods were proposed. While mostly capacitance sensors were used in the past decades for broadband applications [74,75], recently other methods using fiber Bragg gratings (resonant) [76][77][78][79] or laser interferometers (broadband) have demonstrated their feasibility as approaches to detect AE [80,81]. The main purpose of the acoustic emission sensor is the conversion of surface motion of the solid to an electric signal.…”

Section: Detection Of Acoustic Emission Signalsmentioning

confidence: 99%

Acoustic Emission

Sause¹

2016

In Situ Monitoring of Fiber-Reinforced Composites

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Section: Detection Of Acoustic Emission Signalsmentioning

confidence: 99%

Acoustic Emission

Sause¹

2016

In Situ Monitoring of Fiber-Reinforced Composites

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“…It is a high reliability device capable of matching the life expectancy of a generator or a transformer. FBGs are passive structures, immune to electromagnetic interference (EMI), compact, light, have long operating life, can be used in tough environments like extreme temperatures, and are ideal for remote or distributed sensing [ref [1][2][3][4][5][6][7][8][9][10][11]. In a transformer, high frequency PD signal propagates from their source through the oil and arrives at the tank wall [ref 13].…”

Section: Motivation For This Workmentioning

confidence: 99%

Adapting the FBG cavity sensor structure to monitor and diagnose PD in large power transformer

Küng

Wang

Pan

et al. 2013

2013 IEEE Electrical Insulation Conference (EIC)

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Fiber optics vibration sensors have been extensively studied over the last ten years they have mainly been used to capture low frequency signals. One of these investigations has been commercialized to measure and trend End Winding Vibration (SEW) inside larger power generators. This sensor consists of a twin grating cavity and can be used to monitor temperature change as well as vibration. This paper will discuss the adaptation of the FBG cavity structure into a broad band sensor capable of measuring a range of higher frequencies previously identified as PD signals in the transformer from 30K to 300 KHz. Other work has been done to explore the possibility of developing a fiber optics acoustic sensor. The incentive is to overcome the limitation of the resonant based, acoustic, piezoelectric PD sensors previously used to analyze and locate PD. Working in resonance, they are unable to reveal the detailed spectrum or the signature of the PD events. We want to improve the packaging material and structure, then optimize the coupling methods to enhance its signal to noise ratio. All our work is still based on the fiber gratings cavity structure.

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“…Some convincing work published to date on the use of FBG sensors for damage detection involves using an excitation method to detect changes in propagating Lamb waves [43] or by the detection of impacts [41]. The detection of internal fractures in a loaded carbon composite cylinder at the time of generation has also been reported using an extrinsic Fabry-Pérot sensor [44].…”

Section: Acoustic Emission (Ae)mentioning

confidence: 99%

Efficient large-scale multiplexing of fiber Bragg grating and fiber Fabry-Perot sensors for structural health monitoring applications

Cranch¹,

Flockhart²,

Kirkendall

2006

SPIE Proceedings

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Fiber Bragg gratings have been demonstrated as a versatile sensor for structural health monitoring. We present an efficient and cost effective multiplexing method for fiber Bragg grating and fiber Fabry-Perot sensors based on a broadband mode-locked fiber laser source and interferometric interrogation. The broadband, pulsed laser source permits time and wavelength division multiplexing to be employed to achieve very high sensor counts. Interferometric interrogation also permits high strain resolutions over large frequency ranges to be achieved. The proposed system has the capability to interrogate several hundred fiber Bragg gratings or fiber Fabry-Perot sensors on a single fiber, whilst achieving sub-microstrain resolution over bandwidths greater than 100 kHz. Strain resolutions of 30n epsilon/Hz(1/2) and 2 n epsilon/Hz(1/2) are demonstrated with the fiber Bragg grating and fiber Fabry-Perot sensor respectively. The fiber Fabry-Perot sensor provides an increase in the strain resolution over the fiber Bragg grating sensor of greater than a factor of 10. The fiber Bragg gratings are low reflectivity and could be fabricated during the fiber draw process providing a cost effective method for array fabrication. This system would find applications in several health monitoring applications where large sensor counts are necessary, in particular acoustic emission

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Optical fibre acoustic emission sensor for damage detection in carbon fibre composite structures

Cited by 62 publications

References 1 publication

Acoustic Emission

Acoustic Emission

Adapting the FBG cavity sensor structure to monitor and diagnose PD in large power transformer

Efficient large-scale multiplexing of fiber Bragg grating and fiber Fabry-Perot sensors for structural health monitoring applications

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