研究目的
To present and demonstrate a temperature and humidity sensor based on photonic crystal fiber (PCF) coated with graphene oxide (GO) cascaded with two spherical structures, which is sensitive to the change of temperature and humidity.
研究成果
The sensor demonstrates high sensitivity to temperature and humidity, with advantages of low cost, simple construction, and high sensitivity, making it suitable for environmental monitoring applications.
研究不足
The circulating airflow in the temperature and humidity controller may provoke a slight deviation in measurements.
1：Experimental Design and Method Selection:
The sensor is based on Mach–Zehnder interferometer (MZI) principle, utilizing the hydrophilic property of GO to change the refractive index (RI) of the fiber surface with humidity variation.
2：Sample Selection and Data Sources:
The sensor is prepared using PCF (LMA-10 by NKT) and single-mode fiber (SMF-28).
3：8). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Broadband source (BBS), temperature and humidity controller, optical spectrum analyzer (OSA, Anritsu MS9710B), commercial fusion splicer (S178C, Fitel, Japan), GO water dispersion (2 mg/mL).
4：Experimental Procedures and Operational Workflow:
The sensor is fabricated by manual welding using arc discharge, coated with GO using optical driven deposition (ODD) method, and tested for temperature and humidity sensitivity.
5：Data Analysis Methods:
The interference spectrum is analyzed to determine the temperature and humidity sensitivities by monitoring the drift of the interference valleys.
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Optical spectrum analyzer
MS9710B
Anritsu
Used to record and preserve the wavelength of the transmission spectrum.
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Fusion splicer
S178C
Fitel
Used for fabricating the sensor structure.
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Photonic crystal fiber
LMA-10
NKT
Used as the sensing region in the temperature and humidity sensor.
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Single-mode fiber
SMF-28
Used as lead-in and lead-out fibers in the sensor structure.
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Broadband source
BBS
Provides the light source for the sensor.
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Graphene Oxide water dispersion
pioneer nanomaterials
Used to coat the sensing area to improve humidity sensitivity.
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