Sapphire-Derived Fiber Bragg Gratings for High Temperature Sensing

Guo, Qi; Jia, Zhixu; Pan, Xuepeng; Liu, Shanren; Tian, Zhen‐Nan; Zheng, Zhongming; Chen, Chao; Qin, Guanshi; Yu, Yong‐Sen

doi:10.3390/cryst11080946

Cited by 8 publications

(10 citation statements)

References 27 publications

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“…Guo et al used S-FBG in high-temperature measurements using S-FBG measuring 10 µm for the core and 125 µm for the cladding, in measuring temperatures up to 100 0 C, the sensitivity of S-FBG in measuring temperature and strain was 15.64 pm/ 0 C and 15.64 pm/ 0 C, respectively. 1.33 pm/ 0 C (Guo et al, 2021) this result is still far from the results obtained by Usaireuther et al, namely 30 pm/ 0 C and 1.4 pm/ 0 C. from the results of the fabrication carried out by the previous research, it shows that the performance of S-FBG is not yet maximum and can be improved.…”

Section: Introductioncontrasting

confidence: 72%

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Optimum Design Sapphire-Fiber Bragg Grating for High-Temperature Sensing

Ramadhan

Azhar

2022

jppipa, pendidikan ipa, fisika, biologi, kimia

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Fiber Bragg grating (FBG) sensors have limitations in measuring high and extreme temperatures because in general FBG sensors are made of silica fiber, which at high temperatures can interfere with the mechanical performance of the materials. In this paper, we propose an S-FBG (Sapphire Fiber Bragg Grating) sensor which is resistant to extreme environmental influences and high temperatures. By developing S-FBG to measure high temperatures, it is found that S-FBG has high sensitivity, every 10C change is obtained and the Bragg wavelength shifts as far as 30.24 nm, this result is greatly influenced by the thermo-optic coefficient, and the coefficient of expansion-thermal. The design also evaluates the Gaussian apodization profile to improve sensor accuracy in monitoring temperature.

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Section: Introductioncontrasting

confidence: 72%

“…/doi.org/10.1364/oe.22.026825Guo, Q., Jia, Z., Pan, X., Liu, S., Tian, Z., Zheng, Z., Chen, C., Qin, G., & Yu, Y. (2021).…”

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confidence: 99%

Optimum Design Sapphire-Fiber Bragg Grating for High-Temperature Sensing

Ramadhan

Azhar

2022

jppipa, pendidikan ipa, fisika, biologi, kimia

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“…We assume that, using the average of

over several spectra, the temperature uncertainty could be reduced by an order of magnitude toward the performance of the best high-temperature thermocouples. Another way to reduce the measurement uncertainty would be by reducing the number of modes (see Table 1 ) of the sapphire fiber as described in [ 12 , 19 , 20 ].…”

Section: Discussionmentioning

confidence: 99%

“…The FBG was found to even withstand exposure to 1900 °C [ 11 ]. Recent reports also show that single-mode sapphire fibers may successfully be used for the purpose, although their small diameter usually requires some form of cladding as mechanical support, which tends to limit the operational temperature range [ 18 , 19 ]. Hence, for the highest temperatures, one would typically be required to use a thicker sapphire fiber to ensure sufficient mechanical robustness.…”

Section: Introductionmentioning

confidence: 99%

Metrological Characterization of a High-Temperature Hybrid Sensor Using Thermal Radiation and Calibrated Sapphire Fiber Bragg Grating for Process Monitoring in Harsh Environments

Eisermann

Krenek

Habisreuther

et al. 2022

Sensors

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Fiber Bragg gratings inscribed in single crystalline multimode sapphire fibers (S-FBG) are suitable for monitoring applications in harsh environments up to 1900 ∘C. Despite many approaches to optimize the S-FBG sensor, a metrological investigation of the achievable temperature uncertainties is still missing. In this paper, we developed a hybrid optical temperature sensor using S-FBG and thermal radiation signals. In addition, the sensor also includes a thermocouple for reference and process control during a field test. We analyzed the influence of the thermal gradient and hotspot position along the sensor for all three detection methods using an industrial draw tower and fixed point cells. Moreover, the signal processing of the reflected S-FBG spectrum was investigated and enhanced to determine the reachable measurement repeatability and uncertainty. For that purpose, we developed an analytical expression for the long-wavelength edge of the peak. Our findings show a higher stability against mechanical-caused mode variations for this method to measure the wavelength shift compared to established methods. Additionally, our approach offers a high robustness against aging effects caused by high-temperature processes (above 1700 ∘C) or harsh environments. Using temperature-fixed points, directly traceable to the International System of Units, we calibrated the S-FBG and thermocouple of the hybrid sensor, including the corresponding uncertainty budgets. Within the scope of an over 3-weeks-long field trial, 25 production cycles of an industrial silicon manufacturing process with temperatures up to 1600 ∘C were monitored with over 100,000 single measurements. The absolute calibrated thermocouple (Uk=2≈1K…4K) and S-FBG (Uk=2≈10K…14K) measurements agreed within their combined uncertainty. We also discuss possible strategies to significantly reduce the uncertainty of the S-FBG calibration. A follow-up measurement of the sensor after the long-term operation at high temperatures and the transport of the measuring system together with the sensor resulted in a change of less than 0.5 K. Thus, both the presented hybrid sensor and the measuring principle are very robust for applications in harsh environments.

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“…Although labelled single-mode [17] it is clarified within the text that it is not strictly single-mode and it has a multimoded profile. Alternatively, a few-mode FBG inside a sapphire derived fiber with sapphire core and silica-based cladding has been demonstrated [18]. However, the operating temperature range is constrained to less than 1000°C by the temperature limit of the silica cladding material.…”

Section: Introductionmentioning

confidence: 99%

Single-mode sapphire fiber Bragg grating

et al. 2022

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Sapphire optical fiber has the ability to withstand ultrahigh temperatures and high radiation, but it is multimoded which prevents its use in many sensing applications. Problematically, Bragg gratings in such fiber exhibit multiple reflection peaks with a fluctuating power distribution. In this work, we write single-mode waveguides with Bragg gratings in sapphire using a novel multi-layer depressed cladding design in the 1550 nm telecommunications waveband. The Bragg gratings have a narrow bandwidth (<0.5 nm) and have survived annealing at 1000°C. The structures are inscribed with femtosecond laser direct writing, using adaptive beam shaping with a non-immersion objective. A single-mode sapphire fiber Bragg grating is created by writing a waveguide with a Bragg grating within a 425 µm diameter sapphire optical fiber, providing significant potential for accurate remote sensing in ultra-extreme environments.

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Sapphire-Derived Fiber Bragg Gratings for High Temperature Sensing

Cited by 8 publications

References 27 publications

Optimum Design Sapphire-Fiber Bragg Grating for High-Temperature Sensing

Optimum Design Sapphire-Fiber Bragg Grating for High-Temperature Sensing

Metrological Characterization of a High-Temperature Hybrid Sensor Using Thermal Radiation and Calibrated Sapphire Fiber Bragg Grating for Process Monitoring in Harsh Environments

Single-mode sapphire fiber Bragg grating

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