Underlying mechanisms, applications, and limitations of chemical composition gratings in silica based fibers

Fokine, Michael

doi:10.1016/j.jnoncrysol.2004.08.208

Cited by 44 publications

(28 citation statements)

References 21 publications

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“…It can also change the optical thermo-optical coefficient [17], [18]. The mechanisms that cause the regeneration of the FBG have been widely discussed in the literature and several models have been proposed [10], [19], [20]. After the regeneration the RFBGs have been tested at temperatures up to 1100 .…”

Section: Gratings Regenerationand Decay Studymentioning

confidence: 99%

Packaged Optical Sensors Based on Regenerated Fiber Bragg Gratings for High Temperature Applications

et al. 2012

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We report on temperature sensors based on regenerated fiber Bragg gratings (RFBGs) for measurements up to 1100 C. The annealing process required to regenerate such gratings makes the optical fiber too delicate, thus making an adequate packaging necessary. Prior to the grating regeneration the optical fiber is protected with a ceramic tube which in turn is shielded with a thick metal casing. We have performed a thorough characterization of the thermo-optical response of both packaged and unpackaged RFBG sensors placing especial attention on possible residual hysteresis after several temperature cycling tests. The response and recovery times of packaged sensors were found to be, respectively, 9 s and 22 s. Index Terms-High-temperature, optical fiber sensor, packaging, regenerated fiber Bragg gratings.

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Section: Gratings Regenerationand Decay Studymentioning

confidence: 99%

Packaged Optical Sensors Based on Regenerated Fiber Bragg Gratings for High Temperature Applications

et al. 2012

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“…An absorption spectroscopy revealed that there still remain some OH-groups and molecular water in the grating but a higher volume remained in the UV-exposed parts when the grating is annealed at an elevated temperature and the reflected Bragg wavelength diminishes into the noise level [5]. The periodic distribution of the OH-groups and molecular water might result in the periodical crystallization [7] or the change of dopants diffusion in the grating [15] in which a periodic refractive index structure is finally formed.…”

Section: Resultsmentioning

confidence: 99%

“…5. This is due to the fact that thermo-optic coefficient is wavelength dependent [16] and the diffusion process is distance dependent [15]. From Fig.…”

Section: Temperature Properties Of Rfbgsmentioning

confidence: 94%

“…Obviously, the RFBG formed in 1560 nm withstands a higher temperature at 900°C in which a rapid decay is observed for the 1310 nm RFBG. The diffusion process is quadratically dependent on the distance which indicates that the grating period has an effect on the thermal stability [15]. A grating with large period exhibits a better thermal stability.…”

Section: Temperature Properties Of Rfbgsmentioning

confidence: 99%

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1.3 and 1.55 $\mu{\rm m}$ Thermally Regenerated Gratings in Hydrogenated Boron/Germanium Co-Doped Photosensitivity Fiber

et al. 2014

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In this paper, we have experimentally demonstrated thermal regeneration of gratings at 1310 and 1560 nm in the hydrogenated boron/germanium codoped photosensitivity fibers. Increase in effective index of the fiber and reduced grating period are observed in the regenerated fiber Bragg grating (RFBG). The experimental results show that the temperature sensitivity of regenerated gratings at 1310 and 1560 nm is 8.7 and 12.8 pm/°C, respectively, and the RFBG with larger period withstand a higher thermal stability.

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“…Intrinsic optical fibre sensors such as chemical composition sensors [1,2], fibre Bragg gratings [3], sapphire sensors [4] and Fabry-Perot (F-P) interferometers have been demonstrated to be both suitable and robust for measuring temperatures in harsh environments. Furthermore they are highly versatile, they have miniature sizes (≤150μm) and are immune to electromagnetic interference [5,6].…”

Section: Introductionmentioning

confidence: 99%

Long-term stability testing of optical fibre Fabry-Perot temperature sensors

et al. 2016

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Prema ThermometerHigh Temperature Furnace 3040 r . c r -1 -Type ABSTRACT Applications of fibre optic sensors at high temperatures have gained a huge interest recently, as they appeared to be suitable for temperature recording in harsh environments. In this paper, we are demonstrating two intrinsic Fabry-Perot (F-P) fibre optic sensors for high temperature monitoring. The sensors are consisting of a 125μm diameter single mode fibre (SMF28) and a 125µm diameter PCF ESM-12B pure fused silica fibre spliced to a SMF28, respectively. The result was a low finesse optical SMF-Cr-SMF, and SMF-Cr-PCF, sensor with cavity lengths varying from 50μm to 100μm. Both types of Fabry-Perot sensors were tested in a tube furnace over a temperature range from room temperature up to 1100°C. Following a number of annealing cycles, between the above mentioned temperatures range, very good repeatability of the phase response was achieved. During the cycling process, thermal stress relief takes place which makes the sensors suitable for temperature testing at temperatures just in excess of 1000°C. After initial cycling the sensors are subjected to long term stability tests. The phase response is stable, less than 4°C, over a period of 5 days at a temperature of 1050°C for both sensors. The temperature resolution is around 3°C.

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Underlying mechanisms, applications, and limitations of chemical composition gratings in silica based fibers

Cited by 44 publications

References 21 publications

Packaged Optical Sensors Based on Regenerated Fiber Bragg Gratings for High Temperature Applications

Packaged Optical Sensors Based on Regenerated Fiber Bragg Gratings for High Temperature Applications

1.3 and 1.55 $\mu{\rm m}$ Thermally Regenerated Gratings in Hydrogenated Boron/Germanium Co-Doped Photosensitivity Fiber

Long-term stability testing of optical fibre Fabry-Perot temperature sensors

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