All-fibre optical sensing system: Bragg grating sensor interrogated by a long-period grating

R.W. Fallon, Lin Zhang, L.A. Everall, John A.R. Williams, Ian Bennion

Research output: Contribution to journalArticle

Abstract

We report here a simple, low-cost all-fibre grating strain sensing interrogation technique offering high static-strain resolution (Q.5με) and large dynamic range (>8100με). A key interrogating component of this technique is a long-period grating which acts as an edge filter converting strain-induced wavelength variation into optical power measurement. The transmission profile of the long-period grating is shown to be nearly linear over a sufficiently wide range, yielding a linear relationship between the resultant intensity and applied strain, and a high resolution achieved by standard lock-in techniques.

Original languageEnglish
Pages (from-to)1969-1973
Number of pages5
JournalMeasurement Science and Technology
Volume9
Issue number12
DOIs
Publication statusPublished - Dec 1998

Fingerprint

Long Period Grating
Optical Sensing
Bragg gratings
Diffraction gratings
Bragg Grating
Optical fibers
optical fibers
Fiber
gratings
Sensor
sensors
Sensors
interrogation
dynamic range
Fiber Grating
Dynamic Range
filters
Sensing
fibers
High Resolution

Keywords

  • fibre Bragg gratings
  • modulation
  • smart structures
  • strain

Cite this

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abstract = "We report here a simple, low-cost all-fibre grating strain sensing interrogation technique offering high static-strain resolution (Q.5με) and large dynamic range (>8100με). A key interrogating component of this technique is a long-period grating which acts as an edge filter converting strain-induced wavelength variation into optical power measurement. The transmission profile of the long-period grating is shown to be nearly linear over a sufficiently wide range, yielding a linear relationship between the resultant intensity and applied strain, and a high resolution achieved by standard lock-in techniques.",
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All-fibre optical sensing system : Bragg grating sensor interrogated by a long-period grating. / Fallon, R.W.; Zhang, Lin; Everall, L.A.; Williams, John A.R.; Bennion, Ian.

In: Measurement Science and Technology, Vol. 9, No. 12, 12.1998, p. 1969-1973.

Research output: Contribution to journalArticle

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T1 - All-fibre optical sensing system

T2 - Bragg grating sensor interrogated by a long-period grating

AU - Fallon, R.W.

AU - Zhang, Lin

AU - Everall, L.A.

AU - Williams, John A.R.

AU - Bennion, Ian

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KW - modulation

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