Single-Mode Sapphire Fiber Temperature Sensor
Sapphire fiber can withstand temperatures of around 2000 °C, but it is multimoded, giving poor precision sensors. We have demonstrated a single-mode sapphire fiber Bragg grating temperature sensor operating up to 1200 °C. A single-mode sapphire fiber was formed by writing a depressed cladding waveguide along the length of a 100-μm diameter sapphire fiber using a femtosecond laser. A second-order Bragg grating sensor was inscribed within the waveguide, achieving a reflectivity of >90% and a narrow bandwidth of <0.5 nm. The single-mode sapphire fiber was fusion spliced to standard silica single-mode fiber. The sensor was vibration-tested over a 10 Hz to 30 kHz range with 30 μm displacement, resulting in minimal Bragg wavelength variation of <30 pm standard deviation. The sensor was furnace-tested to 1200 °C, showing ±0.08% repeatability above 1000 °C. This demonstrates the high precision sensing capability of single-mode sapphire fiber Bragg grating sensors with end-to-end single mode interrogation.
Authors
- Tongyu Liu (ORCID: https://orcid.org/0009-0000-5348-7957)
- Mohan Wang (ORCID: https://orcid.org/0000-0001-6678-4993)
- F.P. Payne (ORCID: https://orcid.org/0000-0003-3241-6900)
- Adrian Shipley (ORCID: https://orcid.org/0000-0002-8091-6646)
- Patrick S. Salter (ORCID: https://orcid.org/0000-0003-1688-259X)
- Igor N. Dyson
- Stephen Morris (ORCID: https://orcid.org/0000-0001-8294-9225)
- Julian Fells (ORCID: https://orcid.org/0000-0002-0644-6156)
- Zhitai Jia (ORCID: https://orcid.org/0000-0002-7534-8082)
- Martin J. Booth (ORCID: https://orcid.org/0000-0002-9525-8981)
- Tao Wang (ORCID: https://orcid.org/0000-0001-7852-0901)
- Kaihui Zhang (ORCID: https://orcid.org/0000-0003-4799-9133)
- Jian Zhang (ORCID: https://orcid.org/0000-0002-3865-1867)
Institutions
- Shandong University (CN)
- University of Oxford (GB)
- State Key Laboratory of Crystal Materials
- Rolls-Royce (United Kingdom) (GB)
Publication Details
- Journal
- Journal of Lightwave Technology
- Published
- 2024-08-05
- DOI
- https://doi.org/10.1109/jlt.2024.3438108
- Citations
- 17
- Primary Topic
- Advanced Fiber Optic Sensors
- Type
- article
- Field-Weighted Citation Impact
- 3.55
Funders
- Engineering and Physical Sciences Research Council