Pcf-cavity RFBG fabry-perot resonator for pressure and temperature measurement
A novel PCF-cavity RFBG Fabry-Perot resonator designed for simultaneous pressure and temperature measurement in extreme conditions, featuring high thermal stability and enhanced pressure sensitivity.
Overview
The PCF-cavity Regenerated Fiber Bragg Grating (RFBG) Fabry-Perot resonator is an innovative solution designed for precise, simultaneous measurement of pressure and temperature in high-temperature environments. This technology leverages the enhanced pressure sensitivity of Photonic Crystal Fibers (PCF) and the thermal stability of Regenerated Fiber Bragg Gratings (RFBG). By analyzing shifts in resonance and band-edge wavelengths, this resonator enables discriminative measurement, providing robust, real-time monitoring in extreme conditions.
Technical specifications
- High Thermal Stability: RFBGs exhibit high thermal stability due to stress relaxation and increased refractive index after regeneration, making them suitable for temperatures up to 900°C.
- Enhanced Pressure Sensitivity: The PCF cavity provides superior pressure sensitivity compared to standard fibers, allowing for accurate pressure measurement.
- Simultaneous Measurement: Capable of simultaneous pressure and temperature measurement, minimizing temperature-induced pressure errors due to similar temperature sensitivities of RFBGs and PCF.
- Compact and Robust: The sensor is compact, designed for easy integration into harsh environments.
- Fabrication Process: Includes writing seed FBGs using a 244 nm argon-ion laser, thermal regeneration at 720°C, and splicing to form the Fabry-Perot cavity.
Technology readiness level
This technology is at TRL 4, having been validated in a laboratory setting under conditions ranging from 40 to 175 bar and temperatures up to 900°C. It is poised for further industrial trials to confirm its efficacy in real-world applications.
About Hong Kong Polytechnic University
Hong Kong Polytechnic University is a leading public, application-oriented research university in Hong Kong with a strong culture of industry engagement. Campus-based shared research facilities and an industrial prototyping hub provide prototyping, testing, and scale-up support, enabling companies to collaborate on tangible hardware and digital solutions. A required work-integrated education program connects corporate partners with student talent, while cross-border platforms link projects to manufacturers and markets across the Greater Bay Area. Research is supported by competitive funding from Hong Kong's Research Grants Council and the Innovation and Technology Fund, alongside international programs. A dedicated technology transfer and entrepreneurship office manages IP, licensing, and startup support to move results into use.
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