Using optical fibers for ultrasonic damage detection in aerospace structures

Okabe, Yoji; Wu, Qi

doi:10.1016/b978-0-08-100148-6.00004-4

Cited by 7 publications

(9 citation statements)

References 41 publications

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“…A considered solution is the optical mean that presents a different UW detection mechanism from PZT. Fiber-optic sensors, as a smart detection technology, have attracted considerable interest for their unique properties, and opened up a multitude of opportunities for single-point UW sensing in hard-to-reach electromagnetic spaces, with controllable cross-sensitivities and very compact size for the embedded measurement, as well as a good UW transmission line [ 8 , 9 , 10 , 11 , 12 ]. In order to realize the imaging of seismic physical model, a fiber sensor with a high UW sensitivity needs to be developed.…”

Section: Introductionmentioning

confidence: 99%

UW Imaging of Seismic-Physical-Models in Air Using Fiber-Optic Fabry-Perot Interferometer

Rong

Hao

Zhou

et al. 2017

Sensors

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Abstract:A fiber-optic Fabry-Perot interferometer (FPI) has been proposed and demonstrated for the ultrasound wave (UW) imaging of seismic-physical models. The sensor probe comprises a single mode fiber (SMF) that is inserted into a ceramic tube terminated by an ultra-thin gold film. The probe performs with an excellent UW sensitivity thanks to the nanolayer gold film, and thus is capable of detecting a weak UW in air medium. Furthermore, the compact sensor is a symmetrical structure so that it presents a good directionality in the UW detection. The spectral band-side filter technique is used for UW interrogation. After scanning the models using the sensing probe in air, the two-dimensional (2D) images of four physical models are reconstructed.

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Section: Introductionmentioning

confidence: 99%

UW Imaging of Seismic-Physical-Models in Air Using Fiber-Optic Fabry-Perot Interferometer

Rong

Hao

Zhou

et al. 2017

Sensors

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“…For AE measurement, the Bragg wavelength is set to the middle of the two channels. Therefore, if there is any shift in the FBG reflectivity spectrum, it will reflect as a change in the intensity of the reflected signal [42]. A wavelength interrogation system based on an Echelle diffractive grating (EDG) similar to AWG, based on planar light wave circuits technology has also been demonstrated for AE monitoring and was able to achieve the wavelength resolution of less than 1 pm with a measurement accuracy of ±10 pm [56].…”

Section: Spectrometric Fbg Ae and Ultrasonic Interrogation Systemsmentioning

confidence: 99%

“…This method has multiplexing ability, but it has a relatively low sensitivity because of the spectral profile of the broadband light source. On the other hand, in the edge filter technique [ 42 , 43 , 44 ] a tunable laser source (TLS) or a broadband source is used to adjust the source wavelength to the linear region of the FBG signal spectrum. In this method, a spectrally dependent filter is used to detect any dynamic shifts in the FBG wavelength spectrum and converted to intensity variation by the wavelength-dependent filter.…”

Section: Fbg Interrogation Systems For Ae Monitoringmentioning

confidence: 99%

Fibre Bragg Grating Based Acoustic Emission Measurement System for Structural Health Monitoring Applications

Jinachandran

Rajan

2021

Materials

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Fiber Bragg grating (FBG)-based acoustic emission (AE) detection and monitoring is considered as a potential and emerging technology for structural health monitoring (SHM) applications. In this paper, an overview of the FBG-based AE monitoring system is presented, and various technologies and methods used for FBG AE interrogation systems are reviewed and discussed. Various commercial FBG AE sensing systems, SHM applications of FBG AE monitoring, and market potential and recent trends are also discussed.

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“…Currently, there are two system architectures used in hybrid FBG measurement each with its own demodulation algorithm: power detection and edge filter detection demodulation [14]. In the power detection system, a broadband light source is used to deliver light to an array of FBG sensors.…”

Section: Hybrid Pzt-fo System Principlesmentioning

confidence: 99%

“…When the strain signal shifts the FBG Figure 1. Principle of a power detection demodulation method [14].…”

Section: Hybrid Pzt-fo System Principlesmentioning

confidence: 99%

A Novel Fabry-Pérot Optical Sensor for Guided Wave Signal Acquisition

Cheng¹,

Khodaei²

2020

Sensors

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In this paper, a novel hybrid damage detection system is proposed, which utilizes piezoelectric actuators for guided wave excitation and a new fibre optic (FO) sensor based on Fabry-Perot (FP) and Fiber Bragg Grating (FBG). By replacing the FBG sensors with FBG-based FP sensors in the hybrid damage detection system, a higher strain resolution is achieved, which results in higher damage sensitivity and higher reliability in diagnosis. To develop the novel sensor, optimum parameters such as reflectivity, a wavelength spectrum, and a sensor length were chosen carefully through an analytical model of the sensor, which has been validated with experiments. The sensitivity of the new FBG-based FP sensors was compared to FBG sensors to emphasize the superiority of the new sensors in measuring micro-strains. Lastly, the new FBG-based FP sensor was utilized for recording guided waves in a hybrid setup and compared to the conventional FBG hybrid sensor network to demonstrate their improved performance for a structural health monitoring (SHM) application.

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Using optical fibers for ultrasonic damage detection in aerospace structures

Cited by 7 publications

References 41 publications

UW Imaging of Seismic-Physical-Models in Air Using Fiber-Optic Fabry-Perot Interferometer

UW Imaging of Seismic-Physical-Models in Air Using Fiber-Optic Fabry-Perot Interferometer

Fibre Bragg Grating Based Acoustic Emission Measurement System for Structural Health Monitoring Applications

A Novel Fabry-Pérot Optical Sensor for Guided Wave Signal Acquisition

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