The use of optical frequency-domain reflectometry in remote distributed measurements of the γ-radiation dose

Faustov, Alexey; Gusarov, Andrei; Mégret, Patrice; Wuilpart, Marc; Zhukov, A. V.; Novikov, S. G.; Светухин, В. В.; Fotiadi, Andrei A.

doi:10.1134/s1063785015050053

Cited by 27 publications

(13 citation statements)

References 9 publications

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“…Advanced techniques of fiber optic distributed measurements are very promising for a number of applications such as pressure, strain, vibration and temperature measurements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Among distributed optical fiber sensors, distributed acoustic/vibration sensors (DAS/DVS), which are based on the use of an optical fiber to localize and measure acoustic signals or vibrations along its length, are becoming increasingly attractive for a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

Cost-effective solution for phase-OTDR distributed acoustic/vibration sensing

Spirin

López-Mercado²,

Jason

et al. 2019

Real-Time Measurements, Rogue Phenomena, and Single-Shot Applications IV

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Self-injection locking-an efficient method to improve the spectral performance of semiconductor lasers without active stabilization-has already demonstrated its high potential for operation with single-longitude-mode fiber lasers. Recently, we demonstrated that self-injection locking of a conventional DFB laser through an external fiber optic ring cavity causes a drastic decrease of the laser linewidth and makes possible its direct application in a phase-sensitive optical time domain reflectometry (φ-OTDR) acoustic sensor system. Detection and localization of dynamic perturbations in the optical fiber were successfully demonstrated at the distance of 9270 m. However, the ability of the system to restore the perturbating frequency spectrum was not quantified. Here, we have evaluated the performance of a φ-OTDR system for acoustic/vibration measurements utilizing a conventional telecom DFB laser self-stabilized through an external PM optical fiber ring resonator. The use of PM fiber components prevents the polarization mode-hopping that is proved to be a major source of the laser instability, resulting in single frequency laser operation with 6 kHz linewidth. The laser diode current and the laser fiber configuration temperature both have been stabilized with accuracies better than 0.3%. All laser components have been placed into a special insulating box to protect the laser from external perturbations. Under these conditions, the typical duration of laser operation in self-maintaining stabilization regime is ~30 minutes. The laser long-term frequency drift is estimated to be less than ~30 MHz/min. This low-cost solution is directly compared with the use of a commercial, ultra-narrow linewidth (~ 100 Hz) fiber laser implemented into the same setup. Both systems are tested for measurement of the frequency of vibration applied to a fiber at a distance of 3500 m. The obtained SNR value higher than 6 dB demonstrates the ability of the DFB laser to be used in distributed measurements of vibrations with frequencies up to 5600 Hz with a spatial resolution of 10 meters.

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Section: Introductionmentioning

confidence: 99%

Cost-effective solution for phase-OTDR distributed acoustic/vibration sensing

Spirin

López-Mercado²,

Jason

et al. 2019

Real-Time Measurements, Rogue Phenomena, and Single-Shot Applications IV

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“…Optical fibre properties and responses, indeed, depend on temperature and/or strain and therefore the fibre itself can be used as the sensitive element of the sensor. Different classes of fibre-based sensing techniques have recently been investigated under extreme environments such as Fibre Bragg Gratings (FBGs) for discrete and spatially localised measurements 5 – 7 whereas Brillouin 8 , 9 , Raman 10 , 11 and Rayleigh 12 , 13 scattering phenomena are exploited to design distributed sensors of various environmental parameters such as temperature and/or strain. While Brillouin and Raman sensor spatial resolutions remain in the range of one meter, the advantage of Optical Frequency Domain Reflectometry (OFDR) is that it offers the best spatial resolution of a few µm over 70 m of fibre length 14 , 15 .…”

Section: Introductionmentioning

confidence: 99%

Real time monitoring of water level and temperature in storage fuel pools through optical fibre sensors

Rizzolo

Perisse

Boukenter

et al. 2017

Sci Rep

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We present an innovative architecture of a Rayleigh-based optical fibre sensor for the monitoring of water level and temperature inside storage nuclear fuel pools. This sensor, able to withstand the harsh constraints encountered under accidental conditions such as those pointed-out during the Fukushima-Daiichi event (temperature up to 100 °C and radiation dose level up to ~20 kGy), exploits the Optical Frequency Domain Reflectometry technique to remotely monitor a radiation resistant silica-based optical fibre i.e. its sensing probe. We validate the efficiency and the robustness of water level measurements, which are extrapolated from the temperature profile along the fibre length, in a dedicated test bench allowing the simulation of the environmental operating and accidental conditions. The conceived prototype ensures an easy, practical and no invasive integration into existing nuclear facilities. The obtained results represent a significant breakthrough and comfort the ability of the developed system to overcome both operating and accidental constraints providing the distributed profiles of the water level (0–to–5 m) and temperature (20–to–100 °C) with a resolution that in accidental condition is better than 3 cm and of ~0.5 °C respectively. These new sensors will be able, as safeguards, to contribute and reinforce the safety in existing and future nuclear power plants.

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“…Several techniques have been successfully applied to fulfill this kind of measurement, such as Brillouin [2], Raman [3] [4], as well as Rayleigh scattering [5] [6]. Among a large amount of physical and chemical parameters that OFSs could measure, temperature and strain are the most widely studied [1], since many applications operating in space, military or high energy physics environments require accurate measurements of these two parameters.…”

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confidence: 99%