研究目的
To propose and experimentally investigate a fiber-optic refractive index sensor based on fiber loop ring-down technique with an S fiber taper structure for high-sensitivity measurements.
研究成果
The proposed sensor achieves high sensitivity (?3128.954 μs/RIU) and good linearity in the measured range, with advantages of easy fabrication, micro sensing element, and simple demodulation. Future work should focus on system integration and automation to improve performance.
研究不足
The introduction of the EDFA may produce ASE noise and degrade immunity to light source power fluctuations; measurement range is limited to 1.3330–1.3682; complex configurations or post-processing are needed to mitigate adverse effects.
1：Experimental Design and Method Selection:
The sensor uses a compensated fiber loop ring-down (FLRD) system with an S fiber taper (SFT) as the sensing element, optimized for parameters like wavelength, pulse width, and gain to improve signal quality.
2：Sample Selection and Data Sources:
Glycerol-water solutions with calibrated refractive indices (
3：3330 to 3682) were used as samples. List of Experimental Equipment and Materials:
Includes tunable laser source (TSL-510, Santec), electro-optic modulator (F-10, Avanex), DC power supply (DP1308A, Rigol), optical coupler, erbium-doped fiber amplifier (MCEDFA-C-20-T1, MClight), photodetector (DET01CFC, Thorlabs), oscilloscope (DSO6034A, Agilent), fusion splicer (S183PMII, Fitel), UV glue (NOA61, Norland), electrothermal platform (SET-1010, FYH), and Abbe refractometer (2WAJ, Shanghai Optics).
4：Experimental Procedures and Operational Workflow:
Laser pulses are modulated and injected into the fiber loop; ring-down times are measured as the SFT is immersed in different RI solutions; parameters are optimized for maximum ring-down time and sensitivity.
5：Data Analysis Methods:
Ring-down time is calculated from exponential decay of pulse intensity; linear fitting is used to relate ring-down time to refractive index.
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Tunable Laser Source
TSL-510
Santec
Provides the input laser light for the fiber loop ring-down system.
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Photodetector
DET01CFC
Thorlabs
Detects the output ring-down pulses from the fiber loop.
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Oscilloscope
DSO6034A
Agilent
Records the ring-down pulse traces for analysis.
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Fusion Splicer
S183PMII
Fitel
Used to fabricate the S fiber taper by applying asymmetric axial tension during arc discharge.
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UV Glue
NOA61
Norland
Fixes the SFT on a glass plate.
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Electro-Optic Modulator
F-10
Avanex
Modulates the laser light to generate pulses.
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DC Power Supply
DP1308A
Rigol
Provides bias voltage for the electro-optic modulator.
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Erbium-Doped Fiber Amplifier
MCEDFA-C-20-T1
MClight
Compensates for cavity loss in the fiber loop to improve ring-down signal quality.
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Electrothermal Platform
SET-1010
FYH
Maintains a constant temperature of 25°C for the SFT during experiments.
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Abbe Refractometer
2WAJ
Shanghai Optics
Calibrates the refractive indices of glycerol-water solutions.
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