Attenuation auto-correction method in Raman distributed temperature measurement system

Wang, Z. L.; Zhang, S. S.; Chang, Jun; Lv, Guangping; Wang, W. J.; Jiang, Shende; Liu, X. Z.; Liu, X. H.; Liu, Sha; Sun, Bo; Liu, Y. N.

doi:10.1007/s11082-013-9720-2

Cited by 15 publications

(4 citation statements)

References 12 publications

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“…The intensity of anti-Stokes (AS) Raman scattered light strongly depends on the local fiber temperature more than Stokes (S) Raman scattered light. Thus the temperature (T) can be derived from the ratio of intensities of AS light over S light as follows [10,11]:…”

Section: Theory Of the Dts Systemmentioning

confidence: 99%

Fiber optic distributed temperature sensing for fire source localization

Sun

Tang

Yong

et al. 2017

Meas. Sci. Technol.

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A method for localizing a fire source based on a distributed temperature sensor system is proposed. Two sections of optical fibers were placed orthogonally to each other as the sensing elements. A tray of alcohol was lit to act as a fire outbreak in a cabinet with an uneven ceiling to simulate a real scene of fire. Experiments were carried out to demonstrate the feasibility of the method. Rather large fluctuations and systematic errors with respect to predicting the exact room coordinates of the fire source caused by the uneven ceiling were observed. Two mathematical methods (smoothing recorded temperature curves and finding temperature peak positions) to improve the prediction accuracy are presented, and the experimental results indicate that the fluctuation ranges and systematic errors are significantly reduced. The proposed scheme is simple and appears reliable enough to locate a fire source in large spaces.

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Section: Theory Of the Dts Systemmentioning

confidence: 99%

Fiber optic distributed temperature sensing for fire source localization

Sun

Tang

Yong

et al. 2017

Meas. Sci. Technol.

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“…For the temperature determination, the anti-Stokes Raman scattered light is regarded as the signal light, while the Stokes Raman scattered light is seen as the reference light. Thus the temperature ( T ) dependence of the intensity ratio F( T ) can be expressed as follows [ 21 ]:

where

and

are the intensity of AS light and S light at temperature T , respectively, K AS and K S are coefficients concerning AS and S scattering cross-section, respectively, ν AS and ν S are the frequencies of AS light and S light, h is the Planck constant, ∆ ν is the Raman shift in the transmission medium, and k B is the Boltzmann constant, α AS and α S are the attenuation coefficients for the incident AS and S light, respectively, l is the location along the fiber.…”

Section: Theoretical Analysismentioning

confidence: 99%

Fire Source Localization Based on Distributed Temperature Sensing by a Dual-Line Optical Fiber System

Sun

Tang

Yong

et al. 2016

Sensors

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We propose a method for localizing a fire source using an optical fiber distributed temperature sensor system. A section of two parallel optical fibers employed as the sensing element is installed near the ceiling of a closed room in which the fire source is located. By measuring the temperature of hot air flows, the problem of three-dimensional fire source localization is transformed to two dimensions. The method of the source location is verified with experiments using burning alcohol as fire source, and it is demonstrated that the method represents a robust and reliable technique for localizing a fire source also for long sensing ranges.

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“…The earliest DTS system developed by Dakin et al achieved a good spatial resolution of 3 m with conventional sensing fiber lengths up to 1 km [5]. Due to the unique advantages of immunity to electromagnetic fields, the easiness of installing wire, and remote-distributed measurement, the DTS system attracts numerous studies, and a long sensing distance of >10 km has been achieved based on Raman backscattering, which can be wildly applied in safety and health monitoring of large infrastructure projects, such as warehousing and oil and gas pipelines [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Temperature Distribution Based on Optical Fiber-Sensing Technology and Tunable Diode Laser Absorption Spectroscopy

Sun¹,

Sun²,

Tang³

et al. 2018

Temperature Sensing

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Temperature is an important physical quantity in most industrial processes. Distributed temperature sensor (DTS), fiber Bragg grating (FBG), and tunable diode laser absorption spectroscopy (TDLAS) are three primary techniques for temperature measurement using fiber optic sensing and spectrum technology. The DTS system can monitor space temperature field along the fiber in real time. In addition, it also can locate a fire source using two sections of optical fibers which are placed orthogonally to each other. The FBG temperature sensor is used to measure the point temperature. The temperature sensitivity of the bare FBG is 10.68 pm/ C and the linearity is 0.99954 in the range of 30-100 C. Based on tunable diode laser absorption spectroscopy (TDLAS), two-dimensional (2D) distribution reconstructions of gas temperature are realized using an algebraic reconstruction technique (ART). The results are in agreement with the simulation results, and the time resolution is less than 1 s.

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Attenuation auto-correction method in Raman distributed temperature measurement system

Cited by 15 publications

References 12 publications

Fiber optic distributed temperature sensing for fire source localization

Fiber optic distributed temperature sensing for fire source localization

Fire Source Localization Based on Distributed Temperature Sensing by a Dual-Line Optical Fiber System

Measurement of Temperature Distribution Based on Optical Fiber-Sensing Technology and Tunable Diode Laser Absorption Spectroscopy

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