研究目的
To propose a low-cost, simple and fast method for preparing fiber Fabry-Perot interferometer with miniature structures for high sensitivity temperature sensing.
研究成果
A microfiber Fabry-Perot structure with a cavity length of 41 μm and a microfiber diameter of 50 μm was fabricated, demonstrating a high temperature sensitivity of 3.9 nm/°C. The probe is simple to manufacture, low cost, and suitable for applications in electromagnetic interference and humidity fields.
研究不足
The long-term operational stability and repeatability need to be further verified by experiments. The manufacturing process may not always produce a perfect spherical reflecting end face, affecting the interference modes.
1：Experimental Design and Method Selection
The methodology involves constructing a Fabry-Perot interferometer using a microfiber taper inserted into a silica hollow core fiber with a microsphere end. The interference spectra were analyzed to determine temperature changes.
2：Sample Selection and Data Sources
The samples include a microfiber taper and a hollow core fiber with a microsphere end. Data was collected by monitoring the wavelength location of the special resonance dip in the interference spectra.
3：List of Experimental Equipment and Materials
Microfiber taper, silica hollow core fiber, poly-dimethylsiloxane (PDMS), fiber melting-drawing system (IPCS-5000-ST, Idealphotonics Inc.), fusion splicer, three-dimension fiber adjustment (APFP-XYZ, Zolix Instruments Co., Ltd.), microscope (DMM-300C, Shanghai Caikon Optical Instrument Co., Ltd.), ASE light source (ASE-C light source, Shenzhen Golight Technology Co., Ltd.), spectra analyzer (AQ6370, Yokogawa Electric Corp.).
4：Experimental Procedures and Operational Workflow
The microfiber taper was fabricated by flame scanning drawing method. A spherical hollow fiber was obtained by arc discharge melt technique. The Fabry-Perot structure was constructed by inserting the microfiber taper into the hollow core fiber and filling the cavity with PDMS. The temperature sensitivity was tested by placing the probe in an incubator and monitoring the wavelength shift of the resonance dip.
5：Data Analysis Methods
The temperature sensitivity was determined by analyzing the wavelength shift of the resonance dip in the interference spectra. The resolution was calculated based on the spectral resolution of the analyzing equipment and the temperature sensitivity.
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three-dimension fiber adjustment
APFP-XYZ
Zolix Instruments Co., Ltd.
Used to precisely manipulate the position of the microfiber taper in the hollow core fiber.
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spectra analyzer
AQ6370
Yokogawa Electric Corp.
Used to analyze the interference spectra and determine the wavelength shift of the resonance dip.
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fiber melting-drawing system
IPCS-5000-ST
Idealphotonics Inc.
Used to fabricate the microfiber taper by flame scanning drawing method.
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microscope
DMM-300C
Shanghai Caikon Optical Instrument Co., Ltd.
Used to observe and measure the geometry structure of the microfiber taper and hollow core fiber.
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ASE light source
ASE-C light source
Shenzhen Golight Technology Co., Ltd.
Used as the light source for the interference spectra analysis.
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