研究目的
To propose an inline fiber optic birefringence enhanced accelerometer (FOBEA) with a simple structure, high sensitivity, and broad working frequency band for micro vibration detection in applications like coal mine monitoring.
研究成果
The proposed FOBEA demonstrates high sensitivity and broad frequency response, with FOBEA-1 achieving 1.06 rad/g (20-3800 Hz) and FOBEA-2 achieving 16.97 rad/g (20-2000 Hz). The birefringence gain is enhanced by cylinder materials, and the sensors are stable below 40°C. This makes them suitable for micro vibration monitoring in environments like coal mines.
研究不足
The sensors may have temperature crosstalk above 40°C, requiring high-pass filtering in demodulation. The polyurethane cylinder's additional gain is specific to its material properties, and reproducibility might be affected by fabrication variations. The working frequency band is limited by the natural frequency of the system.
1：Experimental Design and Method Selection:
The study uses a polarized modal interferometer design with a panda polarization maintaining fiber (PMF) wrapped on a transducer cylinder to enhance birefringence. Theoretical models include equations for phase shift, birefringence gain, and sensitivity calculations.
2：Sample Selection and Data Sources:
Two accelerometers are fabricated: FOBEA-1 with a copper cylinder and FOBEA-2 with a polyurethane cylinder. Parameters such as fiber length, cylinder dimensions, and material properties are specified.
3：List of Experimental Equipment and Materials:
Equipment includes a narrow linewidth laser (RIO Orion), PMF polarizer, panda PMF, optical spectrum analyzer (Yokogawa AQ6370C), vibrator (B&K 4809), reference accelerometer (B&K 8305), signal generator (B&K 3160-A-022), power amplifier (B&K 2176), photodiode, and tubular furnace (GSL-1100X). Materials include copper, polyurethane, UV curable acrylate coating, silver film, and silicone.
4：Experimental Procedures and Operational Workflow:
The sensing fiber is wrapped under tension on the cylinder, fixed with silicone, and tested for sensitivity using a vibrator setup. Temperature crosstalk is tested in a furnace. Data is collected using optical spectrum analysis and Fourier transform methods.
5：Data Analysis Methods:
Data is analyzed using Fourier fast transform (FFT) to obtain spatial frequencies, and sensitivity is calculated based on phase shift and birefringence changes. Theoretical models are compared with experimental results.
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Optical Spectrum Analyzer
AQ6370C
Yokogawa
Used to record the output light spectrum and obtain spatial frequencies via FFT.
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Laser
RIO Orion 803 467
RIO
Used as a light source in the experimental setup for the accelerometer.
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Vibrator
4809
B&K
Used to generate vibrations for sensitivity testing of the accelerometer.
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Reference Accelerometer
8305
B&K
Used as a reference to measure applied acceleration during testing.
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Signal Generator
3160-A-022
B&K
Used to drive the vibrator with frequency sweeps.
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Power Amplifier
2176
B&K
Used to amplify signals for the vibrator.
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Tubular Furnace
GSL-1100X
Used for temperature crosstalk testing of the accelerometers.
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Polarization Maintaining Fiber
46th institute of CETC
Used as the sensing fiber in the accelerometer, with specific birefringence properties.
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