研究目的
To propose an efficient and universal sensitivity amplification method for most kinds of sensors based on fiber in-line two-beam Fabry–Perot interferometers (FPIs) by using the femtosecond laser exposure.
研究成果
The proposed sensitivity amplification method based on the Vernier effect induced by femtosecond laser exposure can be directly applied to most kinds of the fiber sensors that are based on the two-beam FPIs. The sensitivity of the fabricated liquid-pressure sensor was improved by about 10 times, and the synchronous measurement of liquid-pressure and temperature was achieved.
研究不足
The detection accuracy of the sensor is influenced by the uncertainty in determining the center wavelength value of the envelope, which may increase measurement errors. The traditional envelope demodulation method may not be conducive to reduce the actual detection limit (DL) of the sensor.
1：Experimental Design and Method Selection:
The study involves the fabrication of a liquid-pressure sensor based on a micro-bubble at the end of the single mode fiber (SMF) and the addition of a third reflection mirror in SMF near the bubble at a certain distance using femtosecond laser exposure to generate the Vernier effect.
2：Sample Selection and Data Sources:
The sensor head was sealed into a liquid chamber at room temperature 20 ?C, connected to a liquid-pressure pump and a pressure meter.
3：List of Experimental Equipment and Materials:
Optical spectrum analyzer (OSA) (YOKOGAWA, AQ6370B), broadband light source (BBS) (1200 nm to 1700 nm), circulator, Ti: sapphire regenerative amplified laser system (Coherent Inc.), objective (NA = 0.45, Nikon), computer-controlled 3D translation stage.
4：45, Nikon), computer-controlled 3D translation stage.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The fabrication process involved splicing a section of silica capillary tube to a conventional SMF, tapering the SCT to form an air-bubble, and using femtosecond laser to add a third reflection mirror. The reflection spectrum was measured in real time under varying water-pressure.
5：Data Analysis Methods:
The relationships between the central wavelength values and water-pressure for both single interference valley and envelope valley were linear fitted to determine sensitivities.
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