Optical fiber distributed temperature sensor using short term Fourier transform based simplified signal processing of Raman signals

Saxena, Manoj Kumar; Raju, Sumathy; Arya, Rajesh; Ravindranath, Swara; Kher, Sanjay; Oak, S. M.

doi:10.1016/j.measurement.2013.09.001

Cited by 35 publications

(15 citation statements)

References 10 publications

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“…The technique proposed in this paper is better than previously reported techniques [18,19] in terms of complexity, automation and requirement of short lengths of calibration zone. Also, the proposed technique does not require any additional filtering or denoising algorithm as this is an inherent feature of the EMD technique.…”

Section: Introductionmentioning

confidence: 84%

See 1 more Smart Citation

Empirical mode decomposition based dynamic error correction in SS covered 62.5/125µm optical fiber based distributed temperature sensor

Saxena

Raju

Arya

et al. 2015

Optics & Laser Technology

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Section: Introductionmentioning

confidence: 84%

“…The schematic of the experimental setup [1,18,20,30] implemented for acquiring backscattered Raman AS and St signals along with other parts is shown in Fig. 1 .…”

Section: Obtaining Raman As and St Signals: Set Up And Experiments Detmentioning

confidence: 99%

Empirical mode decomposition based dynamic error correction in SS covered 62.5/125µm optical fiber based distributed temperature sensor

Saxena

Raju

Arya

et al. 2015

Optics & Laser Technology

Self Cite

View full text Add to dashboard Cite

“…With proper design architecture, it can contribute to enhanced safety and security by providing early warnings of gas and coolant leakages, structural cracks, onset of fire, hot spot detection in pipelines, radiation leaks, etc. Two techniques such as optical time-domain reflectometry (OTDR) [4,[16][17][18][19][20][21][22][23] and wavelength division multiplexing (WDM) are generally used for distributed sensing. In OTDR ( Figure 2), a pulsed laser is coupled to an optical fiber through a directional coupler/splitter.…”

Section: What Is Distributed Sensing?mentioning

confidence: 99%

“…This can be easily calculated from OTDR equation X = ct/2n, where X is the distance from origin (start of fiber taken as zero time), t is the time of event detection, c (3 Â 10 8 m/s) is the velocity of light in the vacuum, and n is the refractive index of fiber for wavelength of operation. If we use a sensing fiber with core refractive index (n) of 1.5 and wish to measure distance (X) traveled after t = 10 ns, then it is easy to calculate that X = 1.0 m by putting the values in OTDR equation [21,23].…”

Section: What Is Distributed Sensing?mentioning

confidence: 99%

Distributed, Advanced Fiber Optic Sensors

Kher¹,

Saxena²

2019

Applications of Optical Fibers for Sensing

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India is poised to use nuclear energy in a big way. The safety of these systems depends upon monitoring various parameters in hazardous environment like high radiation, high temperature exceeding 1000°C, and gas/coolant leakages. In this chapter, we shall dwell on basics of distributed sensing, related instrumentation, device fabrication, and actual advanced field applications. Techniques like Raman scattering, resonance response of fiber gratings, and selective absorption are employed for design, development, and fabrication of distributed sensors and devices. Raman distributed sensors with advanced data processing techniques are finding increasing applications for fire detection, coolant leak detection, and safety of large structures. The systematic investigations related to portable systems developed at the author's lab have been described. Wavelength-encoded fiber gratings are the attractive candidate for high gamma radiation dose measurements in environment such as particle accelerators, fission reactors, food processing facilities, and ITER-like installations. The basics of fiber gratings, their operational designs, and devices based on fiber gratings have been described with advanced applications like high temperature sensing, strain measurements at cryogenic temperatures, and strain in nuclear environment. Finally, novel approaches are described for distributed hazardous gas monitoring for large areas such as airports, train stations, and reactor containment buildings.

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“…Dakin et al managed to monitor temperature by using the anti-Stokes and Stokes Raman backscattering coefficients [10]. Following the studies by Hartog and Dakin, these types of sensors have seen rapid development [11,12]. In 1989, the Brillouin frequency shift was reported to change with temperature and strain [13,14].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the temperature dependence of the Brillouin gain spectrum in short-length single-mode fiber

Göktaş¹,

Yücel²,

Ozturk³

et al. 2017

Turk J Elec Eng & Comp Sci

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Abstract:The Brillouin backscattered wave was examined in a short-length single-mode fiber at different ambient temperatures using a 1553-nm wavelength laser source. To obtain Brillouin scattering depending on the temperature change in a 95-m long single-mode fiber cable, the Brillouin optical time domain reflectometry (BOTDR) technique was used. In this technique, a 1553 nm wavelength signal was sent from one side of the test fiber. The FC/APC connector was attached to the other end of the test fiber. The temperature parameters of the single-mode fiber cables of different brands and types can be obtained using Brillouin scattering. The Brillouin frequency shift is found 0.93 MHz/• C.Measured linear change demonstrated its use as the temperature sensor of Brillouin Scattering.

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Optical fiber distributed temperature sensor using short term Fourier transform based simplified signal processing of Raman signals

Cited by 35 publications

References 10 publications

Empirical mode decomposition based dynamic error correction in SS covered 62.5/125µm optical fiber based distributed temperature sensor

Empirical mode decomposition based dynamic error correction in SS covered 62.5/125µm optical fiber based distributed temperature sensor

Distributed, Advanced Fiber Optic Sensors

Experimental analysis of the temperature dependence of the Brillouin gain spectrum in short-length single-mode fiber

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