Journal ArticleDOI
Spontaneous Brillouin-based distributed temperature sensor utilizing a fiber Bragg grating notch filter for the separation of the Brillouin signal
P.C. Wait,A.H. Hartog +1 more
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TLDR
In this article, a Brillouin optical time domain reflectometer-based distributed temperature sensor utilizing a fiber Bragg grating notch filter to suppress the Rayleigh backscatter was presented.Abstract:
We report on a Brillouin optical time domain reflectometer-based distributed temperature sensor utilizing a fiber Bragg grating notch filter to suppress the Rayleigh backscatter in order to separate the Brillouin signal. The Brillouin light path is thus subject to minimum attenuation and is frequency independent. A 2-m spatial resolution is achieved over a range of 25 km with the temperature resolution rising from 1/spl deg/C at the near end to 7/spl deg/C at the far end in a measurement time of 10 min. This is reduced to <1/spl deg/C over /spl sim/20 km if the measurement time is increased to 180 min.read more
Citations
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Journal ArticleDOI
Development of method for in-service crack detection based on distributed fiber optic sensors:
Branko Glisic,Daniele Inaudi +1 more
TL;DR: Many bridges worldwide are approaching the end of their lifespan and it is necessary to assess their health condition in order to mitigate risks, prevent disasters, and plan maintenance activities as mentioned in this paper, which can be found in this paper.
Journal ArticleDOI
Comparison of the methods for discriminating temperature and strain in spontaneous Brillouin-based distributed sensors.
TL;DR: A 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 measure the intensity and frequency of the single BrillouIn peak in a standard single-mode fiber.
Journal ArticleDOI
Influence of modulation instability on distributed optical fiber sensors based on spontaneous Brillouin scattering
TL;DR: The performance of distributed fiber sensors based on spontaneous Brillouin scattering is largely determined by the peak power governed by nonlinear thresholds that can be launched into the sensing fiber.
Patent
Combined bragg grating wavelength interrogator and brillouin backscattering measuring instrument
TL;DR: In this article, a method for sensing in an optical sensing system comprising an interrogator coupled to a Bragg grating sensor by an optical cable includes the steps of producing a first optical signal, coupling the first signal to the optical cable, resolving a wavelength of first reflected signal, producing a second optical signal and coupling the second signal, and resolving a difference in frequencies between the two signals.
Proceedings ArticleDOI
Distributed temperature sensing (DTS) to characterize the performance of producing oil wells
TL;DR: In this paper, a distributed temperature sensing (DTS) based on Raman scattering is used as an in-situ logging technique in oil and gas wells, which can be used to characterize the performance of a well.
References
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BookDOI
Optical Fiber Sensor Technology
TL;DR: In this article, the authors present an overview of the development of optical fiber sensor technology and its application in the field of temperature measurement and current measurement, as well as other applications.
Journal Article
Brillouin optical-fiber time domain reflectometry
Journal ArticleDOI
A fully distributed simultaneous strain and temperature sensor using spontaneous Brillouin backscatter
TL;DR: In this article, the first simultaneous measurement of strain and temperature using Brillouin backscatter in an optical fiber was presented, which achieved a 100/spl mu//spl epsiv/ strain and 4/spl deg/C temperature resolution, with 40m spatial resolution, over a sensing length of 1200 m.
Journal ArticleDOI
Landau Placzek ratio applied to distributed fibre sensing
P.C. Wait,Trevor P. Newson +1 more
TL;DR: In this article, it was shown experimentally that the ratio of the intensities of Rayleigh and Brillouin backscattered light (Landau Placzek ratio) in an optical fiber has a temperature dependence which may be used for the basis of a distributed temperature sensor.
Journal ArticleDOI
All-fiber system for simultaneous interrogation of distributed strain and temperature sensing by spontaneous Brillouin scattering
TL;DR: A low-loss, long-range, single-ended distributed optical fiber sensor to measure both temperature and strain simultaneously and unambiguously and both strain and temperature measurements can be independently resolved is demonstrated.