研究目的
To develop robust optical fiber sensors for long-term hydrogen monitoring applications by integrating Palladium particles into the silica cladding of polarization-maintaining optical fibers.
研究成果
The study demonstrated that embedding Palladium particles in the cladding of polarization-maintaining optical fibers enhances their sensitivity to H2 gas, resulting in a faster response time compared to fibers without Pd particles. This approach is promising for developing robust sensors for long-term hydrogen monitoring in harsh environments.
研究不足
The response time of the sensors is in the order of hours, which may not be suitable for applications requiring fast detection. The study also did not explore the interplays between the variation of the strain field pattern during the diffusion of H2 gas and the diffusion kinetic of the gas into the SAPs in detail.
1：Experimental Design and Method Selection:
The study involved the fabrication of two Panda-type optical fibers with or without embedded Pd particles to evaluate their sensitivity to H2 gas through birefringence measurements. A high birefringence fiber loop mirror (FLM) configuration was used for measuring the birefringence.
2：Sample Selection and Data Sources:
Two optical fibers were fabricated, one with Pd particles embedded in the stress applying parts (SAPs) and one without.
3：List of Experimental Equipment and Materials:
A gas chamber was developed for on-line measurement of H2 gas impact, including a 3 dB fiber-coupler, an optical spectrum analyzer (OSA), and an optical broadband source.
4：Experimental Procedures and Operational Workflow:
The fibers were exposed to H2 gas at controlled pressure and temperature, and the birefringence variations were measured in real-time.
5：Data Analysis Methods:
The birefringence was calculated from the wavelength spacing between transmission dips in the FLM spectrum.
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