研究目的
To develop a high-sensitivity strain sensor using an in-fiber air-bubble Fabry-Perot interferometer with controllable micro-structure.
研究成果
The developed CO2 laser dot machining technique enables the fabrication of an all-fiber pillar-in-bubble FPI strain sensor with superior strain sensitivity and low-temperature cross-sensitivity. The sensor exhibits fine linearity, high mechanical strength, and miniature size, making it attractive for practical applications.
研究不足
The method requires precise control of the laser machining process to achieve the desired fiber end-face shape. The mechanical strength of the sensor may be compromised if the cavity sidewall is too thin.
1：Experimental Design and Method Selection:
A CO2 laser dot machining technique was used to fabricate an all-fiber pillar-in-bubble Fabry-Perot interferometer (FPI). The method involves sculpting the end facet of the fiber with a laser and suturing the wound using the standard arc-discharge method.
2：Sample Selection and Data Sources:
Standard single-mode fibers (SMFs) were used. The machined fiber end face was designed with a concave core and an annular groove.
3：List of Experimental Equipment and Materials:
CO2 laser, fusion splicer (Type 81C; Sumitomo Electric Industries, Ltd., Japan), translation stage (DM713; Thorlabs Inc., USA), tunable laser (CTL 1500; Toptica Photonics, Germany), photodetector (PDA20CS-EC; Thorlabs Inc.).
4：Experimental Procedures and Operational Workflow:
The fiber end face was machined using multiple laser pulses. The machined SMF was then spliced to an unmachined SMF. The strain sensitivity was characterized by applying tensile strain and measuring the reflection spectrum.
5：Data Analysis Methods:
The wavelength shift of the fringe was measured to determine strain sensitivity. The temperature sensitivity was measured using a heating platform.
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fusion splicer
Type 81C
Sumitomo Electric Industries, Ltd.
Used for splicing the machined SMF to an unmachined SMF.
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translation stage
DM713
Thorlabs Inc.
Used to apply tensile strain to the sample.
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tunable laser
CTL 1500
Toptica Photonics
Used to measure the reflection spectrum of the sensor.
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photodetector
PDA20CS-EC
Thorlabs Inc.
Used to detect the reflection spectrum of the sensor.
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