1,720,978 research outputs found
Brillouin-based distributed fibre temperature sensor at 1.53µm using Raman amplification
No full textThis paper describes the first demonstration of increasing the dynamic range of Brillouin-based distributed temperature sensor at 1533 nm using Raman amplification provided by a 1450 nm pump source
High spatial resolution microwave detection system for Brillouin-based distributed temperature and strain sensors
No full textWe present a microwave detection system for coherent detection of spontaneous Brillouin-based distributed temperature and strain measurements. The system was designed to overcome the existing bandwidth limitations of a previously used commercial spectrum analyser and provide a commercially practical solution to the detection of the Brillouin frequency shift and intensity for long range high spatial resolution measurements. The detection system bandwidth corresponds to a potential spatial resolution of ~60 cm. The system was demonstrated as a temperature sensor over a range of 30 km, with a temperature resolution of 1.6 °C and spatial resolution of ~2 m. It was also demonstrated as a combined temperature and strain sensor over a range of 6.3 km with ~1.3 m spatial resolution; temperature and strain resolutions of 3 °C and 80 µε respectively were achieved
High spatial resolution microwave detection system for long range Brillouin-based distributed sensors
No full textWe present a microwave detection system for long range Brillouin-based sensing with a potential spatial resolution of 60cm. It was demonstrated over 30km, with temperature accuracy of 1.6C, and spatial resolution of 2m
Comparison of the methods for discriminating temperature and strain in spontaneous Brillouin-based distributed sensors
No full textA recently proposed method of measuring the two Brillouin frequencies in a multicompositional fiber core for unambiguously resolving temperature and strain in a distributed sensor is compared with the previously established technique of measuring the intensity and frequency of the single Brillouin peak in a standard single-mode fiber
Distributed Raman amplification combined with a remotely pumped EDFA utilized to enhance the performance of spontaneous Brillouin-based distributed temperature sensors
No full textEnhanced performance of a distributed temperature sensor based on spatially resolving the temperature-dependent intensity of the spontaneous Brillouin scattered signal was accomplished by combining distributed Raman amplification and a remotely pumped erbium-doped fiber amplifier. A temperature resolution of 5.7°C combined with a spatial resolution of 20 m was achieved at a range of 88 km
Long range temperature sensor based on Brillouin frequency shift
No full textKey results: The temperature change measurement at 60km of sensing fibre is reported for the first time. How does the work advance the state-of-the-art?: Measuring temperature change at this long range will help the development of long range high performance temperature distributed optical sensors.Motivation (problems addressed): Long range temperature sensors above 57km have not been previously realised. Existing applications demand greater range
50 km single-ended spontaneous Brillouin based distributed temperature sensor exploiting pulsed Raman amplification
No full textWe demonstrate enhanced performance of a single-ended spontaneous-Brillouin-intensity-based distributed- temperature sensor with a sensing length of 50km and a spatial resolution of 15m by use of Raman amplification of the probe pulse within the sensing fiber. The Raman amplification was achieved with a copropagating pump pulse at 1450nm. The standard deviation error of the temperature resolution was 1C at the front end and increased to less than 13C at 50km with Raman pulse amplification
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