A vibration sensor based on a distributed Bragg reflector fibre laser

Ferreira, Marta S.; Becker, Martin; Bartelt, Hartmut; Mergo, Paweł; Santos, J. L.; Frazão, Orlando

doi:10.1088/1612-2011/10/9/095102

Cited by 14 publications

(10 citation statements)

References 17 publications

(18 reference statements)

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“…In the case of active laser-based sensors, however, the signal is amplified in the optical domain before being detected, rather than in the electronic domain after detection, which leads to a significant improvements in the SNR, especially in the presence of high background noise [22]. An improvement of up to 40 dB in the amplitude and 20 dB in the SNR of the detected vibrations between active (laser-based sensor) and passive devices (illuminating FBGs with a broadband source) under similar conditions has been demonstrated [23]. For remote sensing, considering the typical singlemode fiber losses, an increase of 40 dB in the amplitude of the signal would allow the sensing range to be increased bŷ 100 km.…”

Section: Introductionmentioning

confidence: 87%

“…In optical sensing, several sensors combining the use of FBGs with Rayleigh scattering have been reported. FBGs can be used as sensing heads for the measurement of strain, temperature or others physical parameters, since the variation of these parameters induces changes on the central Bragg wavelength [13,14]. Recently, a temperature-insensitive strain sensor using two different wavelength Raman FBG lasers which used cooperative Rayleigh scattering was reported [15].…”

Section: Introductionmentioning

confidence: 99%

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Intensity vibration sensor based on Raman fiber laser using a distributed mirror combined with Bragg grating structures

2014

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In this work, the authors propose a new configuration for an intensity vibration sensor based on a Raman fiber laser. The linear cavity of the Raman fiber laser relies on the combination of a distributed Rayleigh mirror and fiber Bragg gratings, which are used as the sensing element and intensity filter. The sensor was able to measure vibrations with frequencies of up to 350 Hz with more than 50 dB of signal-to-noise ratio (SNR) and also the amplitude of the vibrations with a sensitivity of up to 0.57 ± 0.07 dB/le for vibrations with a maximum strain variation of up to 35 le. The main advantages of the proposed configuration are the simple scheme with high SNR for remote sensing and the easy possibility of multiplexing.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Intensity vibration sensor based on Raman fiber laser using a distributed mirror combined with Bragg grating structures

2014

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“…In addition, the low refractive index polymer gel used as the bonding agent in the fabrication process also attenuates the loss in the acoustic transmission process. [54]. The DBR sensing head was made of a linear laser cavity formed by two FBG gratings 20 cm apart from each other, written directly in a highly-doped Er 3+ -doped fiber [55].…”

Section: Sensitive Acoustic Vibration Sensor Using Single-mode Fiber mentioning

confidence: 99%

Advanced fiber-optic acoustic sensors

et al. 2014

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Acoustic sensing is nowadays a very demanding field which plays an important role in modern society, with applications spanning from structural health monitoring to medical imaging. Fiber-optics can bring many advantages to this field, and fiber-optic acoustic sensors show already performance levels capable of competing with the standard sensors based on piezoelectric transducers. This review presents the recent advances in the field of fiber-optic dynamic strain sensing, particularly for acoustic detection. Three dominant technologies are identified -fiber Bragg gratings, interferometric Mach-Zehnder, and Fabry-Pérot configurations -and their recent developments are summarized.

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“…Fiber optic sensors have been used in many fields as they are durable, stable, insensitive to electromagnetic interference, tolerant of high temperature, and suitable for long‐distance sensing and networking . One of the useful applications of fiber‐optic sensors is for structural health monitoring (SHM).…”

Section: Introductionmentioning

confidence: 99%

Multimode interference in single mode‐multimode‐single mode fiber structure for steel beam compressive strain measurement

Yusof

Razak

Arof

et al. 2018

Micro & Optical Tech Letters

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A simple optical sensor based on singlemode‐multimode‐singlemode (SMS) optical fiber structure is proposed and demonstrated for the measurement of steel beam compression strain. The SMS sensor probe is fabricated by splicing both ends of a short multimode fiber with two pieces of standard single‐mode fibers using a fusion splicer. The strain sensitivity stems from the difference in the effective refractive index of the core, which induces resonant wavelength shift against the strain. In the experiment, parallel measurements were also made using an electrical resistance (ER) strain gauge for comparison purpose. The SMS sensor was also able to detect the elastic limit of the steel beam from the abrupt shift in the interference wavelength as the compressive strain was increased above 5.351 mm/mm. The sensor showed that the steel beam had an elastic limit at a compressive load of 130 kN, which was in good agreement with the ER strain gauge measurement. Furthermore, the SMS sensor exhibited a compressive strain sensitivity of 0.0323 nm/kN from the initial load until it reached the elastic limit.

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A vibration sensor based on a distributed Bragg reflector fibre laser

Cited by 14 publications

References 17 publications

Intensity vibration sensor based on Raman fiber laser using a distributed mirror combined with Bragg grating structures

Intensity vibration sensor based on Raman fiber laser using a distributed mirror combined with Bragg grating structures

Advanced fiber-optic acoustic sensors

Multimode interference in single mode‐multimode‐single mode fiber structure for steel beam compressive strain measurement

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