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Enhanced sensitivity of distributed-temperature sensor with Al-coated fiber based on OFDR
摘要： In this paper, we present a distributed-optical fiber temperature sensor with enhanced sensitivity with Al coating using the Rayleigh backscattering (RBS) spectrum shift measured via optical frequency-domain reflectometry (OFDR). The Al-coated sensing fiber having a larger thermal expansion coefficient than that of silica produces a strain-coupled shift in the RBS under an increase in temperature. This effect leads to an enhanced temperature sensitivity of the distributed measurement scheme. In order to analyze the principle of temperature sensitivity enhancement, a simple analysis was performed by considering the fiber directional strain and force equilibrium between the optical fiber and Al-coated layer. Our results revealed that the temperature sensitivity achieved with the Al-coated fiber in OFDR was ～56% higher relative to that of a single-mode fiber.
关键词： Al-coated fiber,Distributed sensor,Thermal expansion,Optical frequency-domain reflectometry,Temperature sensitivity
更新于2025-09-19 17:15:36
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Strong fiber Bragg grating sensor based on optoelectrical oscillation for ultra-fast and ultra-stable position-finding and measurement
摘要： This paper proposes a quasi-distribute sensor based on optoelectrical oscillator (OEO) incorporating a uniform strong fiber Bragg grating (FBG). When reflection spectrum of FBG moves to longer wavelength due to external changes, the oscillation will occur and the target position will be mapped into the oscillating frequency. Ultrahigh stability of <14kHz and ultra-short response time of 1.5s are better than many solutions. The sensing threshold can be tuned linearly with the laser operating wavelength with Pearson's r of 0.9989.
关键词： Fiber Bragg grating,Optoelectrical oscillator,Position-finding,Quasi-distributed sensor
更新于2025-09-16 10:30:52
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Influence of the Laser Frequency Drift in Phase-Sensitive Optical Time Domain Reflectometry
摘要： The influence of the laser frequency drift on the operation of phase-sensitive optical time domain reflectometry (?-OTDR) systems is considered. Theoretical results based on a new numerical ?-OTDR model demonstrating the influence of the laser frequency instability on a signal are reported. This model is verified based on experimental data. It has been used to calculate the signal-to-noise ratio (SNR) of the system for different parameters of the laser source stability. As a result, quantitative requirements for lasers used in ?-OTDR systems are formulated.
关键词： laser frequency fluctuation,phase-sensitive optical time domain reflectometer,narrow-band laser,distributed sensor
更新于2025-09-11 14:15:04