研究目的
Investigating the development of a temperature-independent bending sensor based on hollow core microstructured optical fiber (HC-MOF) for applications in mechanical measurement and structural health monitoring.
研究成果
The proposed bending sensor based on HC-MOF demonstrated a nonlinear bending response consistent with numerical simulations and exhibited low thermal sensitivity, making it suitable for bending measurement applications with good isothermal behavior.
研究不足
The sensor's bending response is nonlinear, which may complicate calibration. The temperature sensitivity, although low, could still affect measurements in environments with significant temperature variations.
1：Experimental Design and Method Selection:
The sensor was designed by inserting a section of HC-MOF into two segments of single mode fibers (SMFs) with central-alignment. The bending response was simulated using COMSOL Multiphysics 5.0 and demonstrated experimentally.
2：0 and demonstrated experimentally.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: A sample with a 5.0 cm long HC-MOF was used to measure the bending angle response. The transmission spectrum was investigated by an optical spectrum analyzer (OSA).
3：0 cm long HC-MOF was used to measure the bending angle response. The transmission spectrum was investigated by an optical spectrum analyzer (OSA).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: HC-MOF, SMFs, splicing machine (Fujikura 70S), broadband light source, OSA, electric controlled oven.
4：Experimental Procedures and Operational Workflow:
The HC-MOF was spliced into two sections of SMFs with central alignment. The sensor was fixed on a fiber holder and bent with a step of 2o using a translation stage with a metal plate. The transmission spectrum was recorded for different bending angles and temperatures.
5：Data Analysis Methods:
The differences of effective refractive indexes (ERIs) of HE11 and HE12 modes were calculated under different bending radii. The intensity of multimode interference was calculated to determine the resonance wavelength shift.
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