Simultaneous distributed measurements of temperature and strain using spontaneous Raman and Brillouin scattering

Alahbabi, M.; Cho, Y. T.; Newson, T.P.

doi:10.1117/12.566655

Cited by 8 publications

(3 citation statements)

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“…According to figure 1, Raman and Brillouin scatterings have the same fibre length dependence; the only difference lies in the fact Brillouin scattering is almost 10 3 times higher than Raman scattering, in agreement with the literature (Agrawal 2007). This implies that we can determine the length that maximizes the Brillouin and Raman spontaneous intensities simultaneously; in this case L maximum = 6135 m, which is in agreement with the first HRBDS reported (Alahbabi et al 2004). This is a particular situation when absorption loss can be considered wavelength independent in that range of Brillouin and Raman scattering, according to Smith (1972) and Auyeung and Yariv (1978).…”

Section: Analytical Solutionsupporting

confidence: 87%

“…Therefore, the distributed fibre sensor using both Raman and Brillouin scattering became an interesting subject since it can measure temperature and strain simultaneously, down the fibre, with no ambiguity. Recently, the first HRBDS using both spontaneous Raman and Brillouin scatterings was reported by Alahbabi et al (2004); after that it was demonstrated, using the Raman amplification, that the HRBDS may be used in a long range, such as 50-150 km length (Alahbabi et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Theoretical optimization of optical fibre Raman–Brillouin hybrid sensors

Ribeiro

Toledo²

2010

Meas. Sci. Technol.

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This paper proposes a hybrid distributed fibre sensor which works on Raman and Brillouin scattering generated simultaneously from the same laser beam source. The problem is solved by an analytical and a numerical method to determine some important parameters associated with Raman–Brillouin hybrid distributed fibre sensors, by solving the governing differential equations. Optimization of the hybrid sensor's length is proposed and discussed. The governing equations consider pump depletion caused by all involved effects: Rayleigh, spontaneous and stimulated Raman and Brillouin. Solutions are discussed for three important cases: spontaneous Raman and Brillouin scattering, Brillouin stimulated and Raman spontaneous scattering, and finally both Raman and Brillouin stimulated scattering. It is demonstrated that the sensor's length can be maximized in order to obtain the maximum scattered intensity in two different cases, one of them in good agreement with the literature. It is discussed that the differences between the full numerical solution and the analytical solutions occur mainly due to the approximations made. Results may be used in the distributed sensor's design whose goal is to optimize the sensor's length to get the most intense scattering signal. The implementation of the sensor and its feasibility in all cases is also argued. All results can be applied to Raman amplification systems where Brillouin scattering also takes place.

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Section: Analytical Solutionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Theoretical optimization of optical fibre Raman–Brillouin hybrid sensors

Ribeiro

Toledo²

2010

Meas. Sci. Technol.

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“…However, if both the temperature and strain at a particular place on the fiber change simultaneously, under normal conditions one will not be able to deduce which parameter changed. A few methods have been proposed to solve this measurement problem (Lee et al, 2001;Bao et al, 2002b;Alahbabi et al, 2004). Each of these methods must use the appropriate temperature coefficient, as will be shown later in this article.…”

Section: Strain and Temperature Measurements Using Brillouin Scatteringmentioning

confidence: 99%

Analysis of Brillouin Scattering Based Fiber Optic Sensor Bonding Effects

Brown

Colpitts

et al. 2007

Journal of Intelligent Material Systems and Structures

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Brillouin scattering based sensors can measure strain and/or temperature at all points along an optical fiber; first, the fiber must be calibrated. A problem arises because the temperature coefficient of a fiber bonded to a host is changed by the host structure. Using the loose fiber coefficient could lead to large strain and temperature measurement errors. This article studies the change in the Brillouin temperature coefficient due to bonding. The intrinsic Brillouin temperature coefficient of two fibers is also found. This coefficient allows accurate strain and temperature measurements to be made, assuming the coefficient of thermal expansion of the host is known.

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High precision distributed optical fiber temperature sensing system based on intensity compensation

Huang

Sun

2022

13th International Photonics and OptoElectronics Meetings (POEM 2021)

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Simultaneous distributed measurements of temperature and strain using spontaneous Raman and Brillouin scattering

Cited by 8 publications

References 0 publications

Theoretical optimization of optical fibre Raman–Brillouin hybrid sensors

Theoretical optimization of optical fibre Raman–Brillouin hybrid sensors

Analysis of Brillouin Scattering Based Fiber Optic Sensor Bonding Effects

High precision distributed optical fiber temperature sensing system based on intensity compensation

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