研究目的
Investigating the use of a nonuniformly spaced microwave photonic delay-line filter for high-resolution and large-scale optical sensor network interrogation.
研究成果
The proposed nonuniformly spaced microwave photonic delay-line filter enables simultaneous interrogation of multiple optical sensors of different types with high resolution, offering a promising approach for large-scale optical sensor network interrogation.
研究不足
The simulation demonstrates the concept with a limited number of sensor types. Practical implementation may face challenges in scaling to larger sensor networks and ensuring high resolution across all sensor types.
1：Experimental Design and Method Selection:
The design involves a nonuniformly spaced microwave photonic delay-line filter for interrogating multiple optical sensors simultaneously. The method leverages both amplitude and phase response of the filter to demodulate sensor information.
2：Sample Selection and Data Sources:
Four different types of optical sensors are simulated, including a Fabry-Perot cavity based refractive index sensor, a tilted fiber grating based twist sensor, a FBG-based lateral pressure sensor, and a combination of a FBG sensor and an optical fiber sensor for temperature and transverse loading measurements.
3：List of Experimental Equipment and Materials:
Broadband optical source, electro-optical modulator, optical circulator, Fabry-Perot cavity, erbium-doped fiber amplifier, variable optical attenuator, tunable delay line, polarization controller, tilted fiber Bragg grating, dispersion compensating fiber, photodetector, electrical vector network analyzer.
4：Experimental Procedures and Operational Workflow:
The system is calibrated to form a uniformly spaced microwave photonic delay-line filter. Sensors then modulate the amplitude and time delay of filter taps, converting the filter into a nonuniformly spaced one. The frequency response is analyzed to demodulate sensor information.
5：Data Analysis Methods:
Inverse Fourier transform of the filter's frequency response is used to obtain the temporal impulse response, from which sensor information is extracted.
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broadband optical source
Provides a broadband optical signal for the system.
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electro-optical modulator
Modulates the optical signal with a microwave signal.
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optical circulator
Directs optical signals between different ports.
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Fabry-Perot cavity
Acts as a refractive index sensor.
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erbium-doped fiber amplifier
Amplifies the optical signal.
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variable optical attenuator
Adjusts the amplitude of the optical signal.
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tunable delay line
Adjusts the time delay of the optical signal.
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polarization controller
Controls the polarization state of the optical signal.
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tilted fiber Bragg grating
Acts as a twist sensor.
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dispersion compensating fiber
Compensates for chromatic dispersion in the system.
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photodetector
Converts the optical signal to an electrical signal.
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electrical vector network analyzer
Analyzes the frequency response of the microwave photonic filter.
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