研究目的
To design and implement a precision fiber optic seismic monitoring system for highway rock slope stability assessment.
研究成果
The developed fiber optic seismic monitoring system provides a flat frequency response of 1 to 400Hz and a dynamic range up to 80 dB, showing great potential for stability monitoring of highway rock slope.
研究不足
The system's performance in different environmental conditions and its long-term reliability need further study.
1：Experimental Design and Method Selection:
The system uses FBG geophone and VCSEL-based interrogator for seismic monitoring.
2：Sample Selection and Data Sources:
Field tests were conducted to validate the system.
3：List of Experimental Equipment and Materials:
FBG geophone, VCSEL module, TEC controller, programmable current source, fiber optic splitter, photodiodes, logarithmic amplifiers, ADCs, FPGA, and DSC.
4：Experimental Procedures and Operational Workflow:
The system detects microseismic signals, digitizes them, identifies seismic phases automatically, and transmits data via GPRS wireless network.
5：Data Analysis Methods:
Data acquisition, peak detection, automatic phase identification, and GPRS communication are performed by FPGA and DSC.
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VCSEL module
RayCan
Korea
Provides optical signal for the interrogation system
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TEC controller
MAX1978
Maintains constant temperature for the VCSEL
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Programmable current source
Provides saw-tooth modulation current for the laser
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Fiber optic splitter
1×8
Splits the optical signal power evenly into all the output ports
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Photodiode
Converts light to current
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Logarithmic amplifier
AD8305
Converts PD current to a voltage with a precise logarithmic relationship
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ADC
AD9257
Converts analog signals to digital
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FPGA
XC3S50AN
Processes data for operations such as data acquisition and peak detection
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DSC
STM32F439
Processes data for operations such as automatic phase identification and GPRS communication
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