Fiber strain sensor based on a π-phase-shifted Bragg grating and the Pound-Drever-Hall technique

Gatti, Davide; Galzerano, G.; Janner, Davide; Longhi, Stefano; Laporta, P.

doi:10.1364/oe.16.001945

Cited by 145 publications

(61 citation statements)

References 15 publications

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“…However, the gain medium only shows small and uncontrollable wavelength dependence, so that the sensitivity is low. Recently, ultrasonic sensors based on π-phase-shifted FBGs (πFBG) have attracted a great deal of attention for highly-sensitive ultrasonic detection [5,[8][9][10]. A πFBG can be conceptually considered as a Fabry-Perot cavity formed by two grating mirrors.…”

Section: Introductionmentioning

confidence: 99%

Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection

Han¹,

Liu²,

Hu³

et al. 2013

Opt. Express

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Abstract:We theoretically and experimentally demonstrate a fiber-optic ultrasonic sensor system based on a fiber-ring laser whose cavity consisting of a regular fiber Bragg grating (FBG) and a tunable optical band-pass filter (TOBPF). The FBG is the sensing element and the TOBPF is used to set the lasing wavelength at a point on the spectral slope of the FBG. The ultrasonic signal is detected by the variations of the laser output intensity in response to the cold-cavity loss modulations from the ultrasonicallyinduced FBG spectral shift. The system demonstrated here has a simple structure and low cost, making it attractive for acoustic emission detection in structure health monitoring.

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Section: Introductionmentioning

confidence: 99%

Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection

Han¹,

Liu²,

Hu³

et al. 2013

Opt. Express

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show abstract

“…A number of high-resolution FBG strain sensors based on complex structures have been developed, including Fabry-Perot configuration [8,9], π-phase shifted gratings [10,11] chirped gratings [12], and sampled structures [13]. For instance, Gagliardi et al demonstrated a strain measurement at the 10 −13 ε·Hz −1/2 scale using an FBG resonator with a diode-laser source which is stabilized against quartz-disciplined optical frequency comb [1]; Huang et al proposed a static-strain sensor with a resolution of 1.0 nε based on a π-phase-shifted Bragg grating, combined with a wavelet threshold denoising algorithm [11].…”

Section: Introductionmentioning

confidence: 99%

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

et al. 2018

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Abstract:A cost-effective, robust and embeddable optical interferometric strain sensor with nanoscale strain resolution is presented in this paper. The sensor consists of an optical fiber, a quartz rod with one end coated with a thin gold layer, and two metal shells employed to transfer the strain and orient and protect the optical fiber and the quartz rod. The optical fiber endface, combining with the gold-coated surface, forms an extrinsic Fabry-Perot interferometer. The sensor was firstly calibrated, and the result showed that our prototype sensor could provide a measurement resolution of 30 nano-strain (nε) and a sensitivity of 10.01 µε/µm over a range of 1000 µε. After calibration of the sensor, the shrinkage strain of a cubic brick of mortar in real time during the drying process was monitored. The strain sensor was compared with a commercial linear variable displacement transducer, and the comparison results in four weeks demonstrated that our sensor had much higher measurement resolution and gained more detailed and useful information. Due to the advantages of the extremely simple, robust and cost-effective configuration, it is believed that the sensor is significantly beneficial to practical applications, especially for structural health monitoring.

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“…Fiber-optic ultrasonic sensors based on regular fiber Bragg gratings (FBGs) or π-phaseshifted FBGs have received a great deal of attention in the past decades for their potential applications in structural health monitoring such as ultrasonic testing and acoustic emission (AE) detection [1][2][3][4][5][6][7]. A common demodulation method for these sensors is to use a tunable laser whose wavelength is set within a linear range of the grating spectrum.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed fiber-ring laser sensors for ultrasonic detection

Liu¹,

Hu²,

Han³

2013

Opt. Express

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Abstract:We propose and demonstrate a multiplexing method for ultrasonic sensors based on fiber Bragg gratings (FBGs) that are included inside the laser cavity of a fiber-ring laser. The multiplexing is achieved using add-drop filters to route the light signals, according to their wavelengths, into different optical paths, each of which contains a separate span of erbium-doped fiber (EDF) as the gain medium. Because a specific span of EDF only addresses a single wavelength channel, mode completion is avoided and the FBG ultrasonic sensors can be simultaneously demodulated. The proposed method is experimentally demonstrated using a two-channel system with two sensing FBGs in a single span of fiber. fiber multiwavelength erbium-doped fiber laser functionalized with evanescent field interaction," Laser Phys. ©2013 Optical Society of America

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Fiber strain sensor based on a π-phase-shifted Bragg grating and the Pound-Drever-Hall technique

Cited by 145 publications

References 15 publications

Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection

Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection

An Embeddable Strain Sensor with 30 Nano-Strain Resolution Based on Optical Interferometry

Multiplexed fiber-ring laser sensors for ultrasonic detection

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