研究目的
To study the spectral characteristics and amplitude tunability of a dual-resonance long period grating inside a fiber loop mirror for strain sensing, aiming to achieve high sensitivity and a wider measurement range compared to standard sensors.
研究成果
The combination of a dual-resonance long period grating and a fiber loop mirror provides a highly sensitive strain sensor with a linear response over a wider range (1.1-4.4 mε) and a maximum sensitivity of 1.943 dB/mε. This configuration avoids cross-sensitivity issues and allows for potential applications in multi-parameter sensing. Future work could focus on extending the range and simplifying the interrogation scheme.
研究不足
The strain sensor is limited to the range of 1.1-4.4 mε, beyond which the dual-resonance effect disappears. The setup requires precise tuning with a polarization controller and may be sensitive to environmental factors if not properly isolated. The use of an optical spectrum analyzer increases cost and complexity, though future work could replace it with a power meter for amplitude-only monitoring.
1：Experimental Design and Method Selection:
The experiment involves embedding a dual-resonance long period grating (DR-LPG) inside a fiber loop mirror (FLM) structure to create a strain sensor. The design leverages the interferometric properties of FLM and the high sensitivity of DR-LPG to strain. A polarization controller is used to tune resonance and interferometric peaks.
2：Sample Selection and Data Sources:
The DR-LPG is fabricated on a standard SMF-28 optical fiber with a grating period of 217 nm. The FLM includes a 3 dB coupler, a 0.29 m polarization maintaining (PM) fiber, and the polarization controller. Strain is applied only to the DR-LPG, while the PM fiber is isolated to avoid external perturbations.
3：29 m polarization maintaining (PM) fiber, and the polarization controller. Strain is applied only to the DR-LPG, while the PM fiber is isolated to avoid external perturbations.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Broadband light source (1520-1620 nm range), optical spectrum analyzer (OSA) with 0.1 nm resolution, optical insulator, polarization controller, 3 dB coupler, PM fiber, SMF-28 fiber, fiber holder, weights (10-40 g), and hydrofluoric acid for etching.
4：1 nm resolution, optical insulator, polarization controller, 3 dB coupler, PM fiber, SMF-28 fiber, fiber holder, weights (10-40 g), and hydrofluoric acid for etching.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The setup is illuminated by the light source, and transmission spectra are recorded on the OSA. Strain is applied by hanging weights on the DR-LPG, and the resulting spectra are analyzed. The polarization controller is adjusted to optimize interference peaks between the DR-LPG notches.
5：Data Analysis Methods:
The sensor response is analyzed using a differential interrogation method, subtracting reference peak amplitudes from measured peaks. Linear fitting is applied to determine sensitivity, with correlation coefficients calculated.
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