Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths

Liao, Hao; Lü, Ping; Liu, Li; Wang, Shun; Ni, Wenjun; Fu, Xin; Liu, Deming; Zhang, Jiangshan

doi:10.1109/jphot.2017.2689771

Cited by 61 publications

(24 citation statements)

References 31 publications

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“…Optical fibre sensors (OFS) are considered as an excellent technology with the highest potential for continuous real-time monitoring owing to their accuracy in carrying information, invulnerability to different types of interferences, reliability and versatility, small size and lightweight, high bandwidth, robustness and resistance against harsh environments, high sensitivity, ability to sense several parameters (strain, pressure, corrosion, temperature, and acoustic signals), chemical inertness, biocompatibility, and ability to be integrated into the system [ 17 , 18 , 19 ].OFSs have their applications in various fields such as SHM, seismic monitoring, transformer partial discharge diagnosis, underwater acoustic monitoring, aerospace safety, airborne acoustic detection, photoacoustic spectroscopy, photoacoustic imaging and other such fields [ 20 , 21 ]. There are different kinds of AE OFS technologies such as Fabry–Perot (F–P) cavity sensors, fibre optic ring sensor, fibre optic coupler AE sensors, and fibre Bragg grating (FBG) AE sensors [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ] which have their own advantages and disadvantages. Among the different types of OFS’s, FBGs are widely used and considered the most popular technology for structural health monitoring systems [ 31 ].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

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

Jinachandran

Rajan

2021

Materials

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“…Among diaphragm-based acoustic sensors, most of them are short cavity extrinsic Fabry-Perot interferometers which are composed of a piece of diaphragm and fiber cleaved end. For this acoustic sensors, there are several demodulation methods such as quadrature point based intensity demodulation [15], [24], [25], dual wavelength phase demodulation [21], [26], [27], 3×3 coupler phase demodulation [22], [28], three wavelength demodulation [29], [30] and spectrum demodulation [23], [31]- [34]. For quadrature point based intensity demodulation, it is low-cost and easy to realize while heavily affected by the laser wavelength, laser power and cavity length.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity and High Stability Dual Fabry-Perot Interferometric Fiber-Optic Acoustic Sensor Based on Sandwich-Structure Composite Diaphragm

Zhang

Lü

et al. 2021

IEEE Photonics J.

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A dual Fabry-Perot (FP) interferometric fiber-optic acoustic sensor based on sandwich-structure composite diaphragm is proposed, where fixed phase difference is generated by two FP interferometers (FPIs) with different cavity length. An ellipse fitting differential cross multiplication (EF-DCM) interrogation process is applied for phase demodulation to overcome drawbacks of quadrature point based intensity demodulation, such as temperature drifting, optical power jitter and limited dynamic range. Besides, benefiting from the large area sandwich-structure composite diaphragm, high sensitivity and wide flat frequency response are obtained. Experimental results show that phase sensitivity is-121.11 dB re 1 rad/μPa@250 Hz and sensitivity fluctuation is below 0.8 dB between 2-250Hz. To prove the high stability of the demodulation system, acoustic signal test is performed at different wavelength and different optical power and a fluctuation below 3% is observed. Moreover, profiting from the dual FP sensor structure, the acoustic sensor is get rid of influence of temperature drifting which usually leads to variation of cavity length of fiber optic acoustic sensor. The proposed sensor structure also overcomes drawbacks of traditional dual wavelength demodulation such as extra noise introduced by erbium doped fiber amplifier (EDFA) and high cost.

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“…In order to improve the demodulation speed, a dual-wavelength phase demodulation method was proposed. The dual-wavelength phase demodulation method achieved by modulating the wavelengths of two monochromatic light sources [13], [15]. The two signals with orthogonal phase differences was generated through a certain sensor cavity length in the interferometer system, and the original signal was recovered by DCM algorithm [16].…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Phase Demodulation of Optical Fiber Fabry-Perot Interferometer Based on Birefringent Crystals and Polarization Technology

et al. 2020

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In this paper, we propose and demonstrate the optical fiber Fabry-Perot (F-P) interferometer based on birefringent crystals and polarization technology. For recovering the variation signals, the orthogonal signals are obtained based on the birefringent crystal characteristics and the proposal thickness difference between the two crystals. The differential cross multiplication (DCM) algorithm is utilized to demodulate the orthogonal signals to obtain the phase variation of the optical fiber F-P sensor. The proposed interferometer has a minimum detection phase of 0.014 rad/ √ Hz at the frequency of 25 kHz. In the experiment, two kinds of vibration signals with frequencies of 25 kHz and 15 kHz are used and the proposed interferometer SNR is 70 dB and 75 dB under the corresponding reference environment respectively. The experiment results show that the proposed interferometer can realize the measurement of large dynamic signals and has high stability. The proposed interferometer has the advantages of fast demodulation and good environmental adaptability.

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Phase Demodulation of Short-Cavity Fabry–Perot Interferometric Acoustic Sensors With Two Wavelengths

Cited by 61 publications

References 31 publications

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

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

High Sensitivity and High Stability Dual Fabry-Perot Interferometric Fiber-Optic Acoustic Sensor Based on Sandwich-Structure Composite Diaphragm

Orthogonal Phase Demodulation of Optical Fiber Fabry-Perot Interferometer Based on Birefringent Crystals and Polarization Technology

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