研究目的
To propose and demonstrate an optical fiber Fabry-Perot (F-P) interferometer based on birefringent crystals and polarization technology for dynamic acoustic signal detection.
研究成果
The proposed interferometer based on birefringent crystals and polarization technology demonstrates the ability to measure large dynamic signals with high stability and fast demodulation. It shows good environmental adaptability and can work effectively under high frequency acoustic signals.
研究不足
The proposed interferometer's performance may be affected by the mismatch of the light source and the thickness of birefringent crystals, leading to subtle differences in demodulation results.
1：Experimental Design and Method Selection:
The interferometer is designed based on birefringent crystals and polarization technology to generate orthogonal signals for phase demodulation using the DCM algorithm.
2：Sample Selection and Data Sources:
The optical fiber F-P sensor is used as the sensing interferometer, with a broadband light source in the 1550nm band.
3：List of Experimental Equipment and Materials:
Includes a broadband light source, birefringent crystals, polarizer, analyzer, optical circulator, fiber coupler, photo detector (PD, PDA50B2, THORLABS), and a computer for signal processing.
4：Experimental Procedures and Operational Workflow:
The broadband light is emitted into the optical fiber F-P sensor, and the backreflected signal is split into two channels for demodulation. The orthogonal signals are generated based on the birefringent crystal characteristics and demodulated using the DCM algorithm.
5：Data Analysis Methods:
The phase variation of the optical fiber F-P sensor is obtained by demodulating the orthogonal signals using the DCM algorithm.
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