Sapphire fiber Bragg gratings for high temperature and dynamic temperature diagnostics

Habisreuther, T.; Elsmann, Tino; Pan, Zhiwen; Graf, A.; Willsch, Reinhardt; Schmidt, Markus A.

doi:10.1016/j.applthermaleng.2015.08.096

Cited by 100 publications

(50 citation statements)

References 19 publications

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“…To achieve even higher temperature operation FBGs can be inscribed in materials with higher melting points. Single crystalline aluminium oxide (sapphire) optical fibres have been used with femtosecond laser fabrication [66]. Sapphire FBGs demonstrate remarkable thermal stability up to ∼1600°C for 6 h after a stabilization for 20 min at 1745°C [67].…”

Section: Sapphire Fbgsmentioning

confidence: 99%

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

et al. 2019

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In this paper, various types of high temperature fibre Bragg gratings (FBGs) are reviewed, including recent results and advancements in the field. The main motivation of this review is to highlight the potential of fabricating thermally stable refractive index contrasts using femtosecond (fs) nearinfrared radiation in fibres fabricated with non-conventional techniques, such as the molten core method. As a demonstration of this, an yttrium aluminosilicate (YAS) core and pure silica cladding glass optical fibre is fabricated and investigated after being irradiated by an fs laser within the Type II regime. The familiar formation of nanogratings inside both core and cladding regions are identified and studied using birefringence measurements and scanning electron microscopy. The thermal stability of the Type II modifications is then investigated through isochronal annealing experiments (up to T=1100°C; time steps, Δt=30 min). For the YAS core composition, the measured birefringence does not decrease when tested up to 1000°C, while for the SiO 2 cladding under the same conditions, its value decreased by ∼30%. These results suggest that inscription of such 'Type II fs-IR' modifications in YAS fibres could be employed to make FBGs with high thermal stability. This opens the door toward the fabrication of a new range of 'FBG host fibres' suitable for ultra-high temperature operation. ORCID iDsMaxime Cavillon https:/ /orcid.org/0000-0003-1341-6294 Peter Dragic https:/ /orcid.org/0000-0002-4413-9130 Figure 5. Normalized retardance (averaged over the 0.1 to 1.0 μJ pulse energy range) as a function of temperature for YAG-derived fibre at the core center (YAS) and in the cladding (SiO 2 ), for both // and ⊥ configurations. The measurements were performed at room temperature.

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Section: Sapphire Fbgsmentioning

confidence: 99%

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

et al. 2019

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“…Single-crystal sapphire fibers have a high melting temperature of ∼2045°C, and hence could be developed for fabricating various high-temperature sensors [8][9][10][11][12][13][14][15][16][17][18]. Femtosecond laser pulses have been used to inscribe FBGs in sapphire fibers.…”

mentioning

confidence: 99%

Sapphire fiber Bragg gratings inscribed with a femtosecond laser line-by-line scanning technique

Liao

et al. 2018

Opt. Lett.

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“…Nowadays temperature is one of the most frequently measured physical quantities. The accuracy of temperature measurements often directly determines the quality, effectiveness and safety of industrial manufacturing processes [14][15][16][17][18]. According to [4]: "Statistical data show that the percentage of temperature measurements is 40 % of all measurements in industry.…”

Section: Introductionmentioning

confidence: 99%

“…The expansion of the sphere of temperature measurements [3,4,[18][19][20], the increase in the requirements for their quality [17,21] and the need for non-stationary measurements [15,18,19] imposes additional requirements on sensors [1,4,22], equipment [23,24] and methods of signal processing [20,21].…”

Section: Introductionmentioning

confidence: 99%

Designing an accurate system for temperature measurements

Кочан

2017

E3S Web Conf.

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Abstract. The method of compensation of changes in temperature field along the legs of inhomogeneous thermocouple, which measures a temperature of an object, is considered in this paper. This compensation is achieved by stabilization of the temperature field along the thermocouple. Such stabilization does not allow the error due to acquired thermoelectric inhomogeneity to manifest itself. There is also proposed the design of the furnace to stabilize temperature field along the legs of the thermocouple which measures the temperature of an object. This furnace is not integrated with the thermocouple mentioned above, therefore it is possible to replace this thermocouple with a new one when it get its legs considerably inhomogeneous.. There is designed the two loop measuring system with the ability of error correction which can use simultaneously a usual thermocouple as well as a thermocouple with controlled profile of temperature field. The latter can be used as a reference sensor for the former.

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Sapphire fiber Bragg gratings for high temperature and dynamic temperature diagnostics

Cited by 100 publications

References 19 publications

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

Overview of high temperature fibre Bragg gratings and potential improvement using highly doped aluminosilicate glass optical fibres

Sapphire fiber Bragg gratings inscribed with a femtosecond laser line-by-line scanning technique

Designing an accurate system for temperature measurements

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