研究目的
To evaluate the implications of different pulse widths in the measurement of temperatures at short and long distances in the optical fiber for a Raman-based distributed fiber-optic temperature sensor.
研究成果
The sensor's sensitivity depends on OTDR pulse width and detection region. Using 100 ns pulses provides better sensitivity and resolution (5°C) for near regions, while 4000 ns pulses extend the range to remote sections with lower resolution (10°C). The system is viable for distributed temperature sensing with configurable parameters.
研究不足
The theoretical model does not account for additional signal losses, noise, or amplification effects, leading to discrepancies with experimental results. Sensor range and sensitivity are limited by pulse width, with trade-offs between resolution and distance.
1：Experimental Design and Method Selection:
The study uses a Raman-based distributed temperature sensor (R-DTS) implemented with a commercial OTDR and a standard EDFA amplifier. The theoretical model is based on Bose-Einstein distributions for Stokes and anti-Stokes modes, implemented in Matlab.
2：Sample Selection and Data Sources:
A 27 km standard single-mode fiber link is used, with specific spools (Fiber-1, Fiber-2, Fiber-3) of varying lengths. Fiber-2 is heated in a muffle furnace at controlled temperatures from 30°C to 100°C.
3：List of Experimental Equipment and Materials:
OTDR (Anritsu MT9083C2), EDFA with Erbium-doped fiber, optical circulators, optical bandpass filter, muffle furnace, standard single-mode fiber spools.
4：Experimental Procedures and Operational Workflow:
OTDR emits pulses at 1550 nm, amplified by EDFA, injected into fiber via circulator. Backscattered anti-Stokes signals are filtered and detected. Measurements are taken for pulse widths from 100 ns to 4000 ns, with averages over
5：5 minutes. Data Analysis Methods:
Intensity curves are processed to determine temperature distribution using linear fitting for calibration. Theoretical modeling in Matlab compares with experimental results.
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