研究目的
Investigating the enhancement of sensitivity in optical fiber Fabry–Perot pressure sensors through optimized thin microbubble film shaping.
研究成果
The fabricated sensor demonstrated high sensitivity (6790 pm/MPa) in high-pressure environments, showing great potential for pressure monitoring. Further optimization of film thickness and FP cavity length could enhance sensitivity.
研究不足
The mechanical strength of the thin film may be weak, and the film is prone to cracking. The measurement range is limited by the film's structural integrity.
1：Experimental Design and Method Selection
Utilized a pressure-assisted arc discharge method to prepare silicon microbubbles with a glass tube for decreasing the bubble film’s thickness and improving uniformity. Controlled arc discharge intensity, time, and fiber position to achieve micrometer-scale film thickness.
2：Sample Selection and Data Sources
Used a silica hollow core tube with a 125 μm diameter and 75 μm inner diameter. The plastic coating was removed before fusion.
3：List of Experimental Equipment and Materials
Optical fiber fusion splicer (61s, Fujikura), pressure pump (Kangsite Instrument ConST162), ASE broadband light source, optical spectrum analyzer (OSA, AQ6370D of Yokogawa).
4：Experimental Procedures and Operational Workflow
Connected one end of the hollow core tube to a pressure pump and fused the other end with a single-mode fiber. Applied about 120 kPa atmospheric pressure and melted the tube end with specific discharge parameters. Moved and re-discharged to form a microbubble, then transferred the thin film to form an FP interference cavity.
5：Data Analysis Methods
Analyzed the interference spectrum movement under pressure changes using OSA. Calculated sensitivity based on wavelength shift and pressure change.
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optical fiber fusion splicer
61s
Fujikura
Generating arc discharge for preparing silicon microbubbles.
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optical spectrum analyzer
AQ6370D
Yokogawa
Demodulating the interference spectrum signal.
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pressure pump
ConST162
Kangsite Instrument
Producing high-pressure air in the hollow core of the silica tube.
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broadband source
KG-ASE series
Beijing KangGuan century photoelectric technology co., LTD
Providing incident light for the FP interference chamber.
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