研究目的
To propose and demonstrate a new optical fiber sensor for vibration measurement based on macrobending loss in a standard single-mode fiber loop, achieving high resolution and temperature insensitivity.
研究成果
The proposed optical fiber vibration sensor based on macrobending loss is effective for multi-frequency vibration measurement with a high resolution of 0.04 Hz and is insensitive to temperature variations, making it suitable for harsh environments. It offers simplicity in fabrication and low cost compared to other sensors.
研究不足
The sensor's measurement range is below 1.25 kHz due to hardware constraints; practical resolution is limited to 0.04 Hz, and there may be noise components in the time response. The fiber loop radius must be above 6 mm to avoid breakage risks.
1：Experimental Design and Method Selection:
The sensor is designed using macrobending loss theory in a standard single-mode fiber loop. A simplified model from reference [16] is used for analysis, and simulations are performed to identify quasi-linear regions for vibration sensing.
2：Sample Selection and Data Sources:
A commercial single-mode fiber (Corning, SMF28) is used. Vibration signals are generated by a vibration device and detected using optical and electronic equipment.
3：List of Experimental Equipment and Materials:
Includes a tunable laser source (FLS-2600B), photo-detector (Thorlabs, DET01CFC), vibration device (JZ-40, Beijing Wave Spectrum), oscilloscope (RIGOL, DS2302A), fiber holder fabricated by a 3D printer, and a broadband source (BBS).
4：Experimental Procedures and Operational Workflow:
Light from the laser or BBS is coupled into the fiber loop sensor; output power is detected and converted to electronic signals; vibrations are applied, and signals are analyzed using Fast Fourier Transformation (FFT) to obtain frequency spectra.
5：Data Analysis Methods:
FFT is used to convert time-domain signals to frequency spectra for vibration frequency measurement; simulations and theoretical calculations support the experimental setup.
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