研究目的
To develop an in-fiber Mach-Zehnder interferometer (MZI) with a micro-cavity (MC) for simultaneous measurement of strain and temperature, alleviating the cross-sensitivity issue.
研究成果
The proposed MC-enabled MZI sensor effectively achieves simultaneous strain and temperature measurement with high sensitivities (FPI: 4.24 pm/με strain, 0.26 pm/°C temperature; MZI: -0.98 pm/με strain, 72.5 pm/°C temperature), alleviating cross-sensitivity. It demonstrates excellent high-temperature resistance up to 800°C, easy fabrication, and reliable performance, making it suitable for harsh environments.
研究不足
The device is not designed for large dynamic range or high-resolution measurements, as it requires a moderate number of fringes. Strain sensitivity decreases with increasing MC length, and the fabrication process requires precise control of lateral offset and MC length.
1：Experimental Design and Method Selection:
The study combines experimental and simulation approaches. The sensor integrates a Fabry–Pérot interferometer (FPI) and a Mach-Zehnder interferometer (MZI) using a micro-cavity (MC) made from a hollow quartz tube. The MC acts as both a beam splitter for MZI and an FPI component. Beam propagation method (BPM) simulation is used to analyze light field evolution.
2：Sample Selection and Data Sources:
The sensor is fabricated using single-mode fibers (SMF1, SMF2, SMF3) and a hollow quartz tube (HQT). Devices with different MC lengths (53μm, 103μm, 119μm) are tested to optimize performance.
3：List of Experimental Equipment and Materials:
Hollow quartz tube (Polymicro Technologies, Inc., inner diameter 40μm, outer diameter 93μm), single-mode fibers, fusion splicer (FITEL S178A), broadband source (BBS, Fianium Whitelase Micro), fiber optic circulator (AC photonics), optical spectrum analyzer (OSA, Yokogawa AQ6370), translation stage, temperature-controlled oven (Carbolite Gero).
4：Experimental Procedures and Operational Workflow:
Fabrication involves splicing HQT between SMF1 and SMF2 to form MC, then splicing SMF2 to SMF3 with lateral offset. Strain is applied by moving a translation stage (step 0.03mm, distance 40cm), and temperature is varied in an oven (step 100°C, range up to 1200°C). Spectra are monitored using OSA.
5：03mm, distance 40cm), and temperature is varied in an oven (step 100°C, range up to 1200°C). Spectra are monitored using OSA. Data Analysis Methods:
5. Data Analysis Methods: Spectral dip shifts are measured to calculate sensitivities. Matrix equations are used for simultaneous strain and temperature determination. Errors are analyzed based on OSA resolution (0.02nm).
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Fusion Splicer
S178A
FITEL
Used for splicing fibers and hollow quartz tube to fabricate the sensor structure.
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Optical Spectrum Analyzer
AQ6370
Yokogawa
Detects and analyzes transmission and reflection interference spectra.
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Hollow Quartz Tube
Polymicro Technologies, Inc.
Forms the micro-cavity (MC) for beam splitting and Fabry–Pérot interferometer (FPI) functions in the sensor.
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Broadband Source
Whitelase Micro
Fianium
Provides incident light spectrum for the sensor.
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Fiber Optic Circulator
AC photonics
Transmits light to the sensor and conducts reflection signal to the optical spectrum analyzer.
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Temperature-Controlled Oven
Carbolite Gero
Used for temperature experiments to test sensor response.
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Translation Stage
Applies axial strain to the sensor by moving the lead-out fiber.
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