研究目的
To detect minute vibrations using a displacement sensor based on a Fabry-Pérot interferometer with optical fibers.
研究成果
The Fabry-Pérot interferometer with optical fibers can be used as a displacement sensor for minute vibrations. The study demonstrated the ability to measure minute displacements even under background noise, with a displacement sensitivity of at least 0.28 nm.
研究不足
The Fabry-Pérot interferometer is sensitive to temperature changes and noise other than the measurement target. The direction of displacement detection needs improvement for servo-type seismometers.
1：Experimental Design and Method Selection:
A Fabry-Pérot interferometer was constructed using an optical fiber endface and a metal mirror to measure minute vibrations. The reflected light power was measured to detect displacement.
2：Sample Selection and Data Sources:
Single-mode optical fiber and a distributed feedback laser diode (DFB-LD) with a wavelength of 1550 nm were used as a light source. Two metal mirrors of different reflectance (Au and Ni) were used.
3：List of Experimental Equipment and Materials:
Single-mode optical fiber, DFB-LD, ferrule, metal mirrors (Au and Ni), piezo actuator, oscillator, fusion fiber coupler.
4：Experimental Procedures and Operational Workflow:
The Fabry-Pérot interferometer was constructed with the fiber and mirror. The mirror was vibrated using a piezo actuator, and the reflected power was measured. The air gap between the ferrule and the mirror was varied to study its effect on the interference amplitude.
5：Data Analysis Methods:
The reflected power was analyzed to determine the interference amplitude and its relation to the air gap size. Fourier transform was used to analyze the frequency response of the reflected power.
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single-mode optical fiber
Used as the medium for light transmission and sensing in the Fabry-Pérot interferometer.
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distributed feedback laser diode
DFB-LD
Used as a light source for the interferometer.
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ferrule
Attached to the optical fiber to face the mirror in the interferometer setup.
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metal mirror
Au and Ni mirrors
Used as one of the reflective surfaces in the Fabry-Pérot interferometer.
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piezo actuator
Used to vibrate the mirror for displacement measurement.
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oscillator
Used to drive the piezo actuator.
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fusion fiber coupler
Used to detect the reflected light from the Fabry-Pérot interferometer.
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