Dual-fibre Bragg grating sensor for barometric pressure measurement

Maier, Robert R. J.; Barton, James S.; Jones, Julian D. C.; McCulloch, Scott; Burnell, Gary

doi:10.1088/0957-0233/14/11/021

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…Note that due to the large difference between the Young modulus of the two materials; the neutral axis is essentially located in the middle of the steel blade so that the d factor appearing in Eqs. (4) and Eqs. (5) is essentially given by the geometrical distance between the fiber core and the middle of this steel blade 15 .…”

Section: Fabrication Of the Bending Devicesmentioning

confidence: 99%

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Two different mechanical tuning devices of fiber Bragg gratings

Bélanger

Bernier²,

Bérubé³

et al. 2007

SPIE Proceedings

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This paper presents two different devices for tuning fiber Bragg gratings. The first one is called the beam bending technique while the other is based on purely axial compression. We demonstrate that with a proper choice of the embedding material, the composite beam bending method constitutes an effective and reliable approach for tuning fiber Braggs gratings. We present a long-term stable device with a dynamic range of 80 nm which exhibits insertion losses smaller than 0.28 dB and small variations of the full width at half maximum. In order to reduce the amount of insertion losses, we also demonstrate a new tuning device for fiber Bragg gratings with a wavelength tuning range in excess of 65 nm. A purely axial tuning technique using a highly deformable polymer molded in cylinder shape is used to embed a fiber Bragg grating and to achieve a wavelength tuning range from 1551.7 to 1485.5 nm without insertion losses.

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Section: Fabrication Of the Bending Devicesmentioning

confidence: 99%

“…These optical sensors may involve temperature 2 , strain/force 3 or pressure 4 sensing, and offer multiple advantages 5 . In addition, they are compact, lightweight and small enough to be coated or embedded into structures or substances to create smart materials operating into extreme environments.…”

Section: Introductionmentioning

confidence: 99%

Two different mechanical tuning devices of fiber Bragg gratings

Bélanger

Bernier²,

Bérubé³

et al. 2007

SPIE Proceedings

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“…For example a pressure sensor has been designed based on a novel strain-amplification process, in which 2 Bragg gratings located in a single fibre are placed in close proximity to one another in a T-shaped configuration 10 . The use of dual gratings enables the temperature induced drift of λ g to be compensated (provided both gratings are at the same temperature), with the sensor (as shown in Fig.4), having demonstrated a measurement resolution of <1hPa over the range 800 to 1100hPa.…”

Section: Additional Sensor Typesmentioning

confidence: 99%

Long-term reliability requirements of fiber optic systems for remote sensing applications

McCulloch

Burnell

Boon

et al. 2004

Reliability of Optical Fiber Components, Devices, Systems, and Networks II

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Sensors based on optical fibre materials will be required to tolerate a restrictive combination of physical and environmental parameters for several remote monitoring applications at AWE. These include changes in atmospheric pressure, temperature, humidity, vibration, shock and acceleration, with the sensors being required to operate reliably for periods of up to 30 years with minimal intervention for maintenance. In addition, it is necessary that the sensors can function in the presence of ionising radiation. The sensors are being developed for a number of challenging in-situ physical and chemical measurements. These include remote gas composition analysis, monitoring shape change in compliant materials and the movement of metallic and polymeric components using sensors based on fibre Bragg gratings and interferometric techniques. Reliability issues include the long-term mechanical and optical performance of standard and novel glasses, optical fibres and cables, connectors, couplers, optical switches and Bragg gratings. The durability of materials used in the construction of fibre optic sensing components also requires to be assessed in addition to the epoxy and metallic coatings used to bond these components to a variety of material substrates.

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“…FBGs are very sensitive to axial strain and temperature, and less sensitive to pressure [1]. A number of techniques to facilitate the transduction of the pressure into axial strain have been reported by means, for example of polymer coatings or novel packaging like mechanical enhancement [1,2,3,4]. Other approaches have focussed on transducing the pressure into the transverse loading of the FBG.…”

Section: Introductionmentioning

confidence: 99%

Transversely loaded fibre Bragg grating for pressure measurements

Correia¹,

Chehura²,

James³

et al. 2007

Third European Workshop on Optical Fibre Sensors

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A fibre Bragg grating (FBG) pressure sensor, based upon the transverse loading of half its length, is proposed and demonstrated. When a transverse load is applied to half of the length of an FBG, a second Bragg peak is generated in the reflection spectrum, which separates from the initial Bragg peak. The new peak exhibits a red shift in wavelength as the load is increased. A new data analysis technique, which improves the minimum detectable pressure is discussed. A normalised pressure sensitivity of 5.73x10 -3 ± 5.23x10 -5 MPa -1 was obtained. The technique offers the opportunity to measure independently pressure and temperature using a single FBG sensor element.

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Dual-fibre Bragg grating sensor for barometric pressure measurement

Cited by 12 publications

References 6 publications

Two different mechanical tuning devices of fiber Bragg gratings

Two different mechanical tuning devices of fiber Bragg gratings

Long-term reliability requirements of fiber optic systems for remote sensing applications

Transversely loaded fibre Bragg grating for pressure measurements

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