研究目的
Investigating the performance of an optical fiber Mach-Zehnder interferometer (MZI) based strain sensor fabricated by concatenating two micro cavities with a femtosecond laser.
研究成果
The proposed MZI exhibits a good linearity and reversibility for strain sensing with a sensitivity of -664.2 nm/(cid:2)(cid:2). It is insensitive to external refractive index and has a relatively small temperature sensitivity, making it advantageous for strain sensor applications. The structure is more robust than taper- or trench-based fiber sensors due to no reduction in fiber diameter direction.
研究不足
The fiber sensor is relatively fragile for practical applications, and the intensity of attenuation peak in the spectrum should be improved for good sensing applications.
1：Experimental Design and Method Selection:
The MZI is constructed by concatenating two micro cavities fabricated by a femtosecond laser. The interferometer is applied for strain sensing, and its sensitivity, reversibility, refractive index dependence, and temperature dependence are investigated.
2：Sample Selection and Data Sources:
Sodium chloride (NaCl) solutions are employed for the refractive index test, and a tube furnace is used for temperature dependence investigation.
3：List of Experimental Equipment and Materials:
An amplified Ti: sapphire laser (Spectra Physics, Inc.) of 800 nm, 35fs at a repetition rate of 1 kHz, a 20× objective lens (N.A.=0.45, Olympus), a conventional fusion splicer (model IFS-9, INNO INSTRUMENT, Inc.), a tunable laser (Agilent 81980A), and an optical spectrum analyzer (OSA, Agilent 81636B).
4：45, Olympus), a conventional fusion splicer (model IFS-9, INNO INSTRUMENT, Inc.), a tunable laser (Agilent 81980A), and an optical spectrum analyzer (OSA, Agilent 81636B).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: A micro-hole is fabricated on a fiber end using a femtosecond laser, then a micro cavity is formed by splicing the micro-holed fiber end with a normal cleaver fiber end. The interferometer is characterized with external refractive index variation and temperature increasing.
5：Data Analysis Methods:
The relationship between intensity variation and applied strain is analyzed as a quadratic function. The sensitivity to temperature is calculated by linear fitting.
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