研究目的
Investigating the sensitivity of a fiber temperature sensor based on anti-resonant effect cascaded with multimode interference.
研究成果
A novel fiber temperature sensor based on anti-resonant effect combined with multimode interference is proposed and experimentally demonstrated. The temperature sensitivity of 26.73 pm/°C and -275.39 pm/°C are obtained. Simultaneous measurement of large dynamic range and high resolution can be achieved by the proposed temperature sensor.
研究不足
The sensitivity value is lower than some inline interferometers, which is only based on anti-resonant effect. The mechanism of anti-resonant is merely suitable to large dynamic temperature measurement.
1：Experimental Design and Method Selection:
The sensor head consists of two sections of multimode fiber (MMF) and a short section of single hole twin suspended core fiber (SHTSCF). MMF is fusion spliced between single mode fiber (SMF) and SHTSCF to excite cladding modes in SHTSCF.
2：Sample Selection and Data Sources:
The length of MMFs is 500 μm, and SHTSCF is selected as
3：5mm. A large air hole and two identical suspended cores in SHTSCF have the size of 85 μm and 1 μm, respectively. List of Experimental Equipment and Materials:
SMF, MMF, SHTSCF.
4：Experimental Procedures and Operational Workflow:
Different fiber core modes are excited in MMF due to mode field mismatch between SMF and MMF, then part of modes are coupled into air hole, twin suspended cores and cladding modes in SHTSCF.
5：Data Analysis Methods:
Gauss fit method is used for acquiring the resonant wavelength. FFT filtering method is applied to obtain the high order cladding modes interference.
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