研究目的
Investigating the development of a fiber-optic Fabry-Perot sensor capable of simultaneous measurement of tilt angle and vibration acceleration with high resolution.
研究成果
The proposed fiber-optic sensor is capable of simultaneous measurement for tilt angle and vibration acceleration with a high resolution of 0.023″ within the measurement range from -2.8° to 2.6° and a minimum detectable acceleration up to 120 μg at 180 Hz. It is promising for structural health monitoring applications.
研究不足
Temperature influence on the performance of the tilt angle and vibration acceleration measurements and the need for optimization of the structure to improve the vibration measurement performance.
1：Experimental Design and Method Selection:
The sensor is based on a pendulum structure and a Fabry-Perot interferometer. A fast white-light interferometry (WLI) demodulation algorithm is used to measure the real-time cavity lengths absolutely.
2：Sample Selection and Data Sources:
The sensor's performance is tested using a micro-tilt platform and a vibration table to simulate tilt angle change and vibration perturbation, respectively.
3：List of Experimental Equipment and Materials:
Includes a superluminescent light emitting diode (SLED), a high-speed spectrometer, a micro-angle tilt platform, and a horizontal vibration table.
4：Experimental Procedures and Operational Workflow:
The sensor is mounted on the micro-angle tilt platform fixed on the vibration table. The incident light is coupled into an optical fiber circulator and separated by a 2×2 coupler into the F-P interferometers of the sensor and the AMC, and then reflected back to the high-speed spectrometer.
5：Data Analysis Methods:
The real-time cavity lengths are demodulated from every spectrum at an equivalent sampling rate of 5 kHz. The tilt angle and vibration acceleration are derived from the mean value and the alternating quantity of the real-time cavity lengths, respectively.
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