研究目的
To demonstrate a high sensitivity optical fiber strain sensor based on a Mach-Zehnder interferometer (MZI) using a tapered hollow core fiber (THCF) for improved strain sensitivity and low temperature sensitivity.
研究成果
The proposed THFMZI sensor demonstrates high strain sensitivity (-2.7 pm/με) and low temperature sensitivity (1.6 pm/°C), making it suitable for environments with little temperature fluctuation. The sensor has good stability and repeatability, and it offers a simple production method with potential applications in environmental, biochemistry, micro, and civil systems.
研究不足
The sensor's measurement range is limited to 0 με to 2100 με, and it is more fragile after tapering. The sensor's performance may be affected in environments with significant temperature fluctuations.
1：Experimental Design and Method Selection:
The sensor is fabricated by fusion splicing a tapered hollow core fiber (THCF) between two single mode fibers (SMFs) using an arc fusion splicer. The taper is produced using the built-in taper mode by setting the taper length.
2：Sample Selection and Data Sources:
An initial HCF length of 12 mm was used. The HCF core/cladding diameters are 4/125 μm.
3：List of Experimental Equipment and Materials:
Optical demodulator SM125 (Optical Sensing Interrogator, Micron Optics), temperature control chamber (TCC), THFMZI sensor, and two 3D moving stages.
4：Experimental Procedures and Operational Workflow:
The strain sensing experiment is conducted using the 3D moving stage, and the temperature is measured by the TCC. Different axial strains were applied to the sensor by adjusting the stretching of the micro-displacement platform.
5：Data Analysis Methods:
The transmission spectra were recorded and analyzed using a spectrum analyzer. The strain and temperature sensitivities were calculated based on the wavelength shifts of the interference dips.
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