Wenjie Xu, Qiang Bian, Jianqiao Liang, Zhencheng Wang, Yang Yu, Zhou Meng, "Recent advances in optical fiber high-temperature sensors and encapsulation technique [Invited]," Chin. Opt. Lett. 21, 090007 (2023)
- Chinese Optics Letters
- Vol. 21, Issue 9, 090007 (2023)
![(a) Peak power, wavelength shift and (b) reflection spectra of an RFBG/R2FBG with increasing temperature[42].](/richHtml/col/2023/21/9/090007/img_001.jpg)
Fig. 1. (a) Peak power, wavelength shift and (b) reflection spectra of an RFBG/R2FBG with increasing temperature[42].
![Experimental photograph of liquid sodium temperature measurement using RFBG sensor[38].](/richHtml/col/2023/21/9/090007/img_002.jpg)
Fig. 2. Experimental photograph of liquid sodium temperature measurement using RFBG sensor[38].
![Photograph of the combustion chamber flame tube arrangement of Type-II FBG array temperature probe[51].](/Images/icon/loading.gif){kind=icon}
Fig. 3. Photograph of the combustion chamber flame tube arrangement of Type-II FBG array temperature probe[51].
Fig. 4. (a) Photograph of SFBG structure; (b) reflection spectrum of SFBG at room temperature[16].
Fig. 5. Schematic diagram of the temperature distribution inside an inductively heated furnace using SFBG scanning[58].
Fig. 6. (a) Schematic diagram of SFBG sensor; (b) physical image of the sensor[59].
Fig. 7. (a) Schematic diagram of the FPI structure; (b) SEM top view; (c) SEM cross-sectional view of the FPI structure[87].
Fig. 8. Optical fiber sensor based on HC-PCF. (a) Schematic diagram of the sensor structure; (b) reflection spectra under different temperatures varying from 200°C to 1200°C[88].
Fig. 9. Schematic diagram of sensor probe structure[95].
Fig. 10. Physical image of RFBG sensor encapsulated in alumina ceramic tube and Ni alloy shell[113].
Fig. 11. Physical image of SFBG array encapsulated with sapphire tube[116].
Fig. 12. Physical image of Ni-coated RFBG sensor encapsulated on steel substrate[104].
Fig. 13. Schematic diagram of SFBG sensors protected by metal tubes encapsulated onto a steel plate[103].
Fig. 14. Schematic diagram of stainless-steel substrate encapsulated Type-II FBG three-parameter sensor[105].
Fig. 15. (a) Physical image of the Ni-coated fiber after plating; (b) cross section of the Ni-coated fiber[109].
Fig. 16. Physical image of the Ti-Cu-coated FBG temperature sensor[133].
Fig. 17. Physical image of the Ni-coated FBG-FPI high-temperature strain sensors[134].
Fig. 18. Fiber-embedded aluminum specimen. (a) Physical image; (b) schematic diagram; (c) microscope image of the cross section where the fiber was in direct contact with the aluminum alloy[138].
Fig. 19. (a) Physical image of the embedded high-temperature sensor made by SLM; (b) schematic diagram of the embedded FPI sensor assembly[141].
Fig. 20. Microscope picture of the cross section of the fiber IFPI sensor embedded by CO2 laser sintering[140].
Fig. 21. (a) Schematic diagram of turbine blade with an embedded Ni-FBG sensor fabricated by DED printing for high-temperature monitoring; (b) physical image of a fully DED-printed miniature turbine blade with an embedded Ni-FBG sensor[149].
Fig. 22. (a) Physical image of metal-embedded FBG sensor on aluminum base; (b) optical micrograph of the cross section of the metal-encapsulated FBG sensor[154].
Fig. 23. (a) Embedded compact tension specimen; (b) embedded high-temperature test piece[23].
Fig. 24. Cu/Ni-plated fiber embedded in aluminum 6061-H18 substrate[156].
Fig. 25. Schematic diagram of Li-6 carbonate/sapphire fiber structure[177].
Fig. 26. Schematic diagram of the SDF-based F–P cavity structure[74].
Fig. 27. (a) Experimental setup of HSFBGs inscribed in a sapphire fiber; (b) HSFBG reflection and transmission spectra of multimode fiber coupling. The illustration is the reflection spectrum of HSFBG with SMF coupling[179].
Fig. 28. (a) Microscope image of the SFBG; (b) SFBG reflection spectrum[180].
Fig. 29. (a) Polished sapphire end face; (b) schematic of fusion bonding; (c) successful fusion; (d) failed fusion[181].
Fig. 30. (a) Microscope image of overlapped double conical splicing region between the sapphire fiber (Φ60 µm) and SMF-28e+; (b) SFBG reflection spectrum obtained by using pretapered SMF for splicing[182].
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Table 1. Performance Comparison of FBG High-Temperature Sensors
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Table 2. Performance Comparison of IFPI and EFPI
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Table 3. Performance Comparison of FPI High-Temperature Sensors
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Table 4. Overview of Metal-Embedded Optical Fiber Sensor Embedding Methods and Applications
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