研究目的
To measure refractive index and temperature simultaneously using a novel fiber sensor composed by two single mode fibers and long period fiber grating based on a photonic crystal fiber.
研究成果
The proposed sensor demonstrated high sensitivities for refractive index and temperature measurements, with values of 117.28 nm/RIU and (cid:1)86.29 pm/(cid:3)C, respectively. The sensor's simple structure and small size make it suitable for simultaneous refractive index and temperature measurements in biochemical sensing applications.
研究不足
The effect of bending on long period fiber grating may influence the spectral shape during refractive index measurements. The temperature sensitivity of the photonic crystal fiber long period fiber grating is less than 10 pm/(cid:3)C due to the thermal properties of pure silica.
1：Experimental Design and Method Selection:
The sensor was fabricated by inscribing a long period fiber grating in a photonic crystal fiber using periodic discharge heating. A Mach-Zehnder interferometer was formed due to the presence of two fusion spliced collapsed regions in the photonic crystal fiber.
2：Sample Selection and Data Sources:
Sodium chloride solutions of different concentrations were used for refractive index measurements, and a water bath was utilized for temperature measurements.
3：List of Experimental Equipment and Materials:
A fiber fusion splicer (Fitel, S178A), a super continuous light source (Sc-5-fc), and an optical spectrum analyzer (Aq6370) were used.
4：Experimental Procedures and Operational Workflow:
The sensor was immersed in sodium chloride solutions for refractive index measurements and in a water bath for temperature measurements. The transmission spectrum was recorded for each measurement.
5：Data Analysis Methods:
The wavelength shifts of the resonance dip and interference pattern were analyzed to determine the refractive index and temperature sensitivities.
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