研究目的
To develop a compact in-fiber strain sensor based on twin-core fiber with high sensitivity and low temperature sensitivity for precise strain measurement in practical applications.
研究成果
The developed optical fiber strain sensor based on TCF with novel T-shaped taper demonstrates high strain sensitivity (6.11 pm/με) and low temperature sensitivity (0.69 pm/°C), making it suitable for precise strain measurement in practical applications. The sensor's small size and high sensitivity offer significant advantages for structural health monitoring.
研究不足
The sensor requires precise fabrication techniques and may be sensitive to environmental disturbances. The interference spectrum is inhomogeneous due to the involvement of high-order modes.
1：Experimental Design and Method Selection:
The sensor was fabricated by splicing a segment of TCF with SMF-1 and SMF-2 to form two fiber tapers (weak taper and T-shaped taper). The core mode and cladding modes of the TCF were excited simultaneously for interference.
2：Sample Selection and Data Sources:
A twin-core fiber (TCF) with a cladding diameter of 125 μm and core distance of 30.4 μm was used. The transmission spectrum was monitored by an OSA.
3：4 μm was used. The transmission spectrum was monitored by an OSA. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Commercial fusion splicer (Ericsson, FSU-975), broadband light source (BBS) (YSL Photonics, SC-5), OSA (YOKOGAWA AQ6375), high-accuracy climatic test chamber (Weiss, WT1-180/40).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The TCF was spliced with SMF-1 and SMF-2 to form the sensor structure. The spectral response was measured under different strains and temperatures.
5：Data Analysis Methods:
The interference pattern was analyzed using fast Fourier transform (FFT) method. The strain and temperature sensitivities were calculated based on the wavelength shifts.
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broadband light source
SC-5
YSL Photonics
Provides the light source for the sensor.
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OSA
AQ6375
YOKOGAWA
Monitors the transmission spectrum of the sensor.
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fusion splicer
FSU-975
Ericsson
Used for splicing the TCF with SMF-1 and SMF-2 to form the sensor structure.
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climatic test chamber
WT1-180/40
Weiss
Tests the temperature characteristic of the sensor.
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